Nanotechnology Lawyer & Attorney : Porter Wright Morris & Arthur : Nanotechnology Law Report - Germanium nanobead image provided by UT-Battelle, which manages Oak Ridge National Laboratory for the Department of Energy

On July 20, 2010, David Hwang of Lux Research gave a webinar entitled: "Lux Research Nanomaterials: The Rise of MWNTs: Oversupply Hides Real Opportunities."

Mr. Hwang’s presentation identified the top global producers of multi-walled carbon nanotubes (MWCNTs), explained why commercialization over the past 25 years has been relatively "anemic," and made some predictions for where the market is heading in the next decade. He explained that while total sales of MWCNTs were under $100 million for 2008, the market is predicted to grow to approximately 2389 tons by 2020.

Two major forces slowing past commercialization included (i) a "you first" mentality by which companies wanted to see others take the first successful steps towards commercialization before they joined the trend, and (ii) regulatory risks inherent in the development of any new technology -- a commercialization bottleneck related to the potential environmental, health, and safety (EHS) impacts of certain carbon nanotubes.  (Regular readers will note that this is a recurring theme in our articles).

Mr. Hwang further explained that he believes the market for MWCNTs is currently in a transition phase, and that an oversupply will exist until 2017.  He commented that total sales in 2009 equaled $75 million and would increase to $513 million by 2020.   Mr. Hwang then covered four specific markets that are leading the commercialization for MWCNTs and provided 2009 versus 2020 material usage estimates:

Mr. Hwang closed with some further trends he saw forthcoming in the next decade which included market consolidation and a shakeout of smaller manufacturers, as well as a "crackdown" through EHS regulation of MWCNTs over the next two years.  Regarding the later point, he indicated that companies which proactively addressed EHS issues would have a competitive advantage over the long run.

You can find a link to the webinar here. 

http://bit.ly/dcrrHD.

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The Members of the European Union’s (“EU”) Environment Committee (“MEPs”) recently voted in favor of proposed amendments to the EU’s Restriction of Hazardous Substances Directive, first passed in 2002, banning the use of nanosilver and long multi-walled carbon nanotubes in electrical and electronic products. The legislators also approved language requiring that any electrical or electronic materials containing nanomaterials should be labeled as such and that manufacturers who use nanomaterials would be required to provide the European Commission with safety data on any materials used. Commentators have noted that the MEPs’ definition of nanomaterials is unclear and the current interpretation could require labeling for every electronic product, such as every transistor in a computer chip. A vote on the proposal is expected in October.

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The NanoSafety Consortium for Carbon has recently posted a bibliography of in vivo tox studies on its website.  The bibliography is (obviously) a work in progress.  We would greatly appreciate it if our readers would bring to our attention any pertinent articles that are not already on the bibliography.  The articles will be used to inform and guide our attempt in crafting a representative toxicity testing regime with US EPA.  Many thanks in advance for your input.

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Just a quick plug for our new NanoSafety Consortium for Carbon which was recently launched to address potential EHS issues concerning its members' products.  You can learn more about the consortium at: www.nanosafetyconsortium.com.

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This article originally appeared on the National Nanomanufacturing Network's InterNano website earlier today.  It is licensed under Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported. 

In late December 2009, California’s Department of Toxic Substances Control (DTSC) received the first response¹ to its January 22, 2009 information request regarding carbon nanotubes². The original request targeted 26 purported California manufacturers and/or importers of carbon nanotubes³.

It asked for information regarding analytical test methods, environmental fate and transport, and other relevant environmental, health, and safety information. The request was issued by DTSC under authority granted by California's Health and Safety Code 699, Sections 57018-57020. Stanford University was the first entity to respond to the six specific questions contained in DTSC’s request:

1.  What is the value chain for your company? For example, in what products are your carbon nanotubes used by others? In what quantities? Who are your major customers?

2.  What sampling, detection and measurement methods are you using to monitor (detect and measure) the presence of your chemical in the workplace and the environment? Provide a full description of all required sampling, detection, measurement and verification methodologies. Provide full QA/QC protocol.

3.  What is your knowledge about the current and projected presence of your chemical in the environment that results from manufacturing, distribution, use, and end-of-life disposal?

4.  What is your knowledge about the safety of your chemical in terms of occupational safety, public health and the environment?

5.  What methods are you using to protect workers in the research, development and manufacturing environment

6.  When released, does your material constitute a hazardous waste under California Health & Safety Code provisions? Are discarded off-spec materials a hazardous waste? Once discarded are the carbon nanotubes you produce a hazardous waste? What are your waste handling practices for carbon nanotubes?

Stanford’s response was thoughtful, yet very basic. The University confirmed that it follows standard laboratory safety procedures, has implemented most of the nanosafety guidelines issued by the National Institute for Occupational Safety and Health (NIOSH), and that it treats nano-waste as “hazardous waste” for disposal purposes. A summary of Stanford’s answers follows.

In response to DTSC’s first “value chain” question, Stanford responded that it has identified 16 of its laboratories that are working with carbon nanotubes. Research topics include medical applications, electronics, energy storage, fuel production, fundamental physics, and material science research. To support its “value chain” answer, Stanford attached five research papers resulting from its laboratories’ activities.

Regarding DTSC’s second “monitoring” question, Stanford answered that because there are only minimal risks of exposure and release of carbon nanotubes in its laboratories, it has not yet developed or implemented any quantitative sampling or detection methods. The University also advised that it was working with NIOSH to conduct a possible site visit of its facilities in 2010 to potentially address these issues.

Responding to DTSC’s third question concerning the “projected presence” of carbon nanotubes in the environment which may result from Stanford’s activities, the University answered that there could conceivably be (i) accidental releases and spills, (ii) routine releases from laboratory handling, and (iii) the presence of carbon nanotubes in its laboratory waste stream. Importantly, Stanford indicated that the combined use of carbon nanotubes in all of its laboratories only amounts to approximately 16 grams per year and that its nano-waste stream is treated as “hazardous waste.”

Regarding DTSC’s fourth question concerning Stanford’s knowledge of the possible environmental, health, and safety effects of its carbon nanotubes, the University responded that it takes “a precautionary, but reasonable approach” and uses good laboratory safety practices when working with nanoscale materials. Additionally, Stanford maintained that one the articles attached to its submission supports the position that carbon nanotubes are cleared from the body without adverse health effects. Finally, Stanford indicated that it closely follows the nano-EHS literature posted on NIOSH’s website, as well as the comprehensive nano-EHS website of the International Council on Nanotechnology at Rice University.

In response to DTSC’s fifth question concerning the nano-specific workplace safety measures implemented by Stanford, the University responded that (i) it follows a standard chemical hygiene plan created and implemented under existing California law, (ii) has implemented its “General Principles and Practices for Working Safely with Engineered Nanomaterials,” and (iii) has created a standard operation procedure template for use by its nano-laboratories “to assist in determining the [appropriate] levels and types of controls” which should be used in each laboratory working with nanoscale materials. Stanford’s “General Principles” document⁴ can be found on its website and basically summarizes the key points from NIOSH’s “Approaches to Safe Nanotechnology” document⁵ in a condensed bullet point format.

Finally, regarding DTSC’s sixth “hazardous waste” question, Stanford largely mooted the question by explaining that it treats its carbon nanotube waste stream as “hazardous waste,” whether or not such material actually constitutes “hazardous waste” from a scientific and/or regulatory perspective.

On the whole, Stanford put considerable effort into its response to DTSC’s information request, but it contained no “earth shattering” revelations. The University appears to be following state of the art procedures for working safely with carbon nanotubes. More importantly, there was little information in Stanford’s response that the State did not already know or could have learned with a simple telephone call. Of course, all of this begs the question of whether a formal data call in was even necessary in the first place and/or whether California is squandering its rapidly diminishing capital on this project. At the very least, the data call in should have contained a minimum threshold requirement in order to weed out minimal users and to prevent them from having to engage in the time consuming process which Stanford went through.

References:

1. Stanford University CNT Submittal Letter
2. DTSC January 22, 2009, Information Request Regarding Carbon Nanotubes
3. DTSC Carbon Nanotube Contact List
4. Stanford's General Principles Document
5. NIOSH's Approaches to Safe Nanotechnology

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New Edition of Nanotechnology Law Report

Inside you will find:

• EPA Considering New Approach to Nanoscale Materials Under TSCA
• EPA May Issue Mandatory Data Collection Rule for Nanoscale Materials Under TSCA
• EPA Takes Aim at Antimicrobial Products Under FIFRA
• EPA Unveils New Principles for Chemical Management Reform
• EPA Report on the Use of Nanoscale TiO2 in Water and Sunscreens
• EPA Withdraws Carbon Nanotube SNURs
• Press Release: New Contributing Editor for InterNano
• Virginia CLE presentation: “Insurance, Nanotechnology, and Risk”
• Nanoparticles and Deaths in the People’s Republic
• Sweating the Small Stuff
• Soil Association Cites China Deaths in Renewed Call for Moratorium on Nanotechnology Commercialization
• Nanotechnology Legislation in the 111th Congress
• Mapping Nano
• Flight of the Nanobees

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Nanotechnology Law & Business just published our new article on the EPA's recent treatment of nanoscale materials under the Toxic Substances Control Act.  An abstract for the article is below and you can find a copy of the article itself here.

Abstract: This article provides a summary of recent (2008-2009) regulatory efforts by the U.S. Environmental Protection Agency under the Toxic Substances Control Act concerning nanoscale materials. These efforts include entering into two consent orders with a manufacturer of carbon nanotubes; issuing four significant new use rules for two siloxane-based nanoparticles and two carbon nanotubes (and then withdrawing the latter two); intimating that new testing and data collection rules will be implemented for certain nanoscale materials; and proposing and/or requiring acute toxicity rat inhalation testing regimes in certain instances. The authors explain these developments in detail and then provide some initial strategic and legal considerations for businesses attempting to navigate this emerging regulatory thicket.

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Readers may interested in learning that EPA issued a clarification today regarding its single-walled and multi-walled carbon nanotube SNURs previously issued in June 2009. EPA's announcement follows.  Stay tuned . . .

Good afternoon.  On June 24, 2009, the U.S. EPA issued final Significant New Use Rules (SNURs) under the Toxic Substances Control Act (TSCA) for 23 new chemicals, including two carbon nanotubes (nanoscale materials) (http://www.epa.gov/fedrgstr/EPA-TOX/2009/June/Day-24/t14780.pdf).  The SNURs will allow the commercialization of these specific carbon nanotubes under limited conditions to protect against unreasonable risks to human health and the environment.  

The SNURs require companies to notify EPA at least 90 days before manufacture, import, or processing of the specific carbon nanotubes for any activity not meeting the conditions specified in the rules at 40 C.F.R. 721.10155  and 40 C.F.R. 721.10156.

Upon reviewing the rules some stakeholders have asked EPA whether these SNURs apply to all variants of carbon nanotubes. This is not the case. These SNURs only apply to the specific carbon nanotubes that were the subject of the premanufacture notices (PMNs) submitted under Section 5 of TSCA and not to any other carbon nanotubes.  Other carbon nanotubes must be notified through EPA's New Chemicals Program.   The U.S. EPA strongly encourages all manufacturers and importers of nanoscale materials that are intended for commercial use to consult with the Agency in advance of production or importation.

If you have any questions, please contact:

Zofia Kosim (202-564-8733) or kosim.zofia@epa.gov
Jim Alwood (202-564-8974) or alwood.jim@epa.gov
--------------------------------------------------------------------
David E. Giamporcaro
Industry and Small Business Liaison
Environmental Assistance Division
Office of Pollution Prevention and Toxics
U.S. Environmental Protection Agency
East Building
1200 Pennsylvania Avenue, N.W. (MC7408M)
Washington, D.C. 20460
Phone: (202)564-8107
Fax: (202)564-8813

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Here is the Summer 2009 edition of Nanotechnology Law Report.  The newsletter contains the below-listed articles (and more):

• EPA Issues Significant New Use Rules for Carbon Nanotubes
• Are Nanoparticles Released by Cutting or Compounding Nano-Composites?
• Annual Nano TiO2 Production Estimated at 44,000 Metric Tons
• Are Nano Consumer Products Headed Underground?
• Oversight of Next Generation Nanotechnology
• Regulating Nanotechnologies
• More Interesting Nano-Regulatory Developments
• Nano Tug of War
• Pumpkins & Nanoparticles
• Green Nano
• NanoBiotech 2009
• Take two silver nanoparticles and call me in the morning
• International Approaches to the Regulatory Governance of Nanotechnology
• ETUC Resolution on Nanotechnologies and Nanomaterials
• Private Spending on Nano Exceeds Government Spending
• EMERGNANO Released

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In the June 24, 2009 federal register, the U.S. Environmental Protection Agency (EPA) issued two proposed Significant New Use Rules (SNUR) under Section 5(a) of the Toxic Substances Control Act (TSCA) for multi-walled and single walled carbon nanotubes.  The SNURs followed up on the EPA's prior September 2008 consent orders entered into with Thomas Swan & Co. Ltd. (Swan) for two of its Elicarb carbon nanotube products.

Under TSCA, the prior September 2008 consent orders were only binding on Swan.  "Consequently, after signing a Section 5(e) Consent Order, EPA generally promulgates a Significant New Use Rule (SNUR) that mimics the Consent Order to bind all other manufacturers and processors to the terms and conditions contained in the Consent Order.  The SNUR requires that manufacturers, importers and processors of certain substances notify EPA at least 90 days before beginning any activity that EPA has designated as a "significant new use. These new use designations are typically those activities prohibited by the Section 5(e) Consent Order."

Under the terms of the Septmeber 2008 consent orders which are incorporated into the new proposed SNURs, significant new uses of multi-walled and singled-walled carbon nanotubes are deemed to occur when employees do not “use gloves impervious to nanoscale particles and chemical protective clothing;” and/or fail to “use a NIOSH-approved full-face respirator with an N-100 cartridge while exposed by inhalation in the work area.”

Thus, the new proposed SNURs require these same conditions.

Manufacturers should also be aware that the EPA considers carbon nanotubes new chemical substances requiring full PMN notice, registration, and approval under Section 5 of TSCA, and has initiated at least one recent enforcement action against a carbon nanotube manufacturer who has failed to properly register its products.

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Perhaps the most overlooked issue when examining potential nano-related environmental, health, and safety concerns is whether there is any true likelihood of exposure in reasonably foreseeable use scenarios.  While there should continue to be extensive toxicity testing for certain nanoscale materials, the most interesting research (from my perspective) relates to potential workplace and/or condumer exposure in realistic settings.  We examine two studies along these lines below.

C. Su-Jung et al., "Control of Airborne Nanoparticles Releases During Compounding of Polymer Nanocomposites," 3 Nano: Brief Reports and Reviews 4, 301 - 309 (2008).

This study was conducted by researchers at the National Science Foundation-funded Center for High-Rate Nanomanufacturing at the University of Massachusetts at Lowell.  The scientists examined potential nanoparticle release related to the twin-screw extruder compounding of polymer nanocomposites.  The test was conducted because "commercial compounding (mixing) of nanocomposites is typically achieved by feeding the nanoparticles and polymer into a twin-screw extruder, the airborne particles associated with nanoparticles reinforcing agents are of particular concern, as they can readily enter the body through inhalation."

The nanoparticles in question were nano aluminum oxide particles acquired from Nanophase Technologies in commercially available form.  The particles were spherical in shape and ranged from 27 to 53 nm in diameter.  They were also specifically "engineered to form agglomerates with a nominal size of 200 nm."

Regarding the test itself, the scientists fed 2.3kg of polymer pellets and 0.16 kg of nano-alumina particles into a twin-screw extruder for processing and then measured potential nanoparticle release through two measurement techniques: (i) TSI Fast Mobility Particle Spectrometer for real time measurement; and (ii) personal air sampling using a special filter media designed to catch nanoparticles. 

The study concluded that "[t]he twin-screw extrusion process for compounding polymer nanocomposites tends to break up nanoparticle aggregates and mechanically disperse particles thoroughly during the extrusion process."  The study also found that "[nano]particle diffusion was enhanced by . . . poorly-performing local and general exhaust systems."

Interestingly, for part of the test the scientists applied a nominal engineering control by covering the open top of the extruder feeding tube throat with aluminum foil which they found "dramatically reduced" nanoparticle measurements.  They also found that consistently cleaning the lab after each use "reduced laboratory background nanoparticle concentration."

D. Bello et al., "Exposure to nanoscale particles and fibres during machining of hybrid advanced composite containing carbon nanotubes," 11 J. Nanopart Res 231 - 249 (2009).

The researchers in this study investigated whether and to what extent airborne nanoparticles were generated by wet and dry cutting of two hybrid carbon nanotube composites.  The dry cutting method employed a diamond coated band saw.  The wet cutting was performed using a diamond grit rotary cutting wheel with water lubricating the cutting surfaces during the process.  Because the scientists were interested in potential "worst case" scenarios, no vacuum or emission controls were used in tests.

The researchers found that wet cutting did not produce airborne nanoparticle emissions above background levels, but that dry cutting "generated statistically significant quantities of nanoscale and fine particles as compared to background (p<0.05), regardless of the composite type, . . . as expected."

Interestingly, the study also found that "CNTs, either individual or in bundles, were not observed in extensive microscopy of collected samples" for either wet or dry tests.

We will continue to track down and summarize these types of potential exposure studies.  Right now, they are few and far between.

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The April issue of Environmental Health Perspectives carries a short article summarizing a seminar at the 2009 AAAS Annual Meeting titled "Driving Beyond Our Nano-Headlights?". In the summary, there is a brief reference to work done by Vanesa Sanchez, a graduate student at Brown University. The results of her experiment are rather alarming.

Ms. Sanchez work showed that

very low doses of CNTs . . . appeared to cause lesions known as granulomas similar to what occurs with asbestos fibers. Moreover, the CNTs formed a cage-like structure that . . .  might promote granuloma formation.

It is too bad that the summary didn't give more space to a study that could have a profound effect on future nanomanufacturing facilities and possible future governmental regulation of the nano-industry.

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On January 22, 2009, California's Department of Toxic Substances Control (DTSC) sent a formal request to several California manufacturers and/or importers of carbon nanotubes seeking information regarding analytical test methods, environmental fate and transport, and other relevant environmental, health, and safety information regarding carbon nanotubes.  The request was issued by DTSC under its authority granted under California's Health and Safety Code 699, Sections 57018-57020.

DTSC asked manufacturers to answer the following questions:

What is the value chain for your company? For example, in what products are your carbon nanotubes used by others? In what quantities? Who are your major customers?

What sampling, detection and measurement methods are you using to monitor (detect and measure) the presence of your chemical in the workplace and the environment? Provide a full description of all required sampling, detection, measurement and verification methodologies. Provide full QA/QC protocol.

What is your knowledge about the current and projected presence of your chemical in the environment that results from manufacturing, distribution, use, and end-of-life disposal?

What is your knowledge about the safety of your chemical in terms of occupational safety, public health and the environment?

What methods are you using to protect workers in the research, development and manufacturing environment?

When released, does your material constitute a hazardous waste under California Health &Safety Code provisions? Are discarded off-spec materials a hazardous waste? Once discarded are the carbon nanotubes you produce a hazardous waste? What are your waste handling practices for carbon nanotubes?

Recipients have one year to supply the requested information.

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Earlier today, the EPA published an interim status report regarding its Nanoscale Materials Stewardship Program.  A final report is expected in early 2010.

Nanoscale Materials Stewardship Program, Interim Report, January 2009, U.S. Environmental Protection Agency, Office of Pollution Prevention and Toxics.

At the outset, EPA notes that "[t]he findings and conclusions [of the] report should not be construed or interpreted to represent any Agency regulatory or statutory guidance or statement of official Agency policy."   Several companies submitting NMSP data should be relieved by this disclaimer, as EPA identified 18 nanoscale materials in NMSP submissions which may be considered new chemical substances under TSCA and subject to premanufacturing notice requirements.  Whether EPA takes any enforcement steps in this regard remains to be seen.

Getting to the highlights of the report, EPA concludes that the NMSP has (thus far) produce mixed results:

• "In the aggregate, the NMSP has sufficiently advanced EPA’s knowledge and understanding to enable the Agency to take further steps towards evaluating and, where appropriate, mitigating potential risks to health and the environment."
• "It appears that nearly two-thirds of the chemical substances from which commercially available nanoscale materials are based were not reported under the Basic Program."
• "It appears that approximately 90% of the different nanoscale materials that are likely to be commercially available were not reported under the Basic Program."
• "The low rate of engagement in the In-Depth Program suggests that most companies are not inclined to voluntarily test their nanoscale materials."

EPA's overall conclusion is that:

"[T]he NMSP can be considered successful. However, a number of the environmental health and safety data gaps the Agency hoped to fill through the NMSP still exist. EPA is considering how to best use testing and information gathering authorities under the [TSCA] to help address those gaps."

My own view is that response to the NMSP has been lukewarm, at best.

Analysis of Current Submissions

As of December 8, 2008 information under the Basic Program has been submitted by 29 companies/associations, covering 123 nanoscale materials.  Seven additional companies have also committed to submitting data under the Basic Program at a future date.  The In-Depth Program has commitments from four companies thus far.   Additionally, the American Chemistry Council (ACC) has expressed an interest in coordinating In-Depth data submissions. 

A chart from the interim report breaking down Basic Program submissions by material type follows.  Nanoscale metals and metal oxides predominate.  Many materials are still in the research and development stage.

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The EC's 2006 Registration, Evaluation, Authorisation and Registration of Chemicals ("REACH") regulations place "the responsibility for the management of the risks of [chemical] substances with. . .[the companies that] manufacture, import, place on the market or use [the] substances in the context of their professional activities."  Guidance on Registration, Guidance for the Implementation of REACH, European Chemicals Agency, Version 1.3, May 2008, at p. 12.  

To this end, REACH requires companies manufacturing or importing chemical substances in quantities greater than one ton per year to register those substances before they "can be manufactured, imported or placed on the market."  As part of these requirements, "manufacturers and importers need to collect or generate data on the substances and assess how risks to human health and environment can be controlled by applying suitable risk management measures."  This can often be an expensive and time consuming process.

Providing some relief in certain circumstances, Article 2(7)(a) of Regulation (EC) No 1907/2006 provides that certain substances are exempt from registration under REACH because "sufficient information is known about these substances that they are considered to cause minimum risk because of their intrinsic properties." These substances are listed in REACH Annex IV.

On October 8, 2008, the EC removed carbon and graphite from Annex IV "due to the fact that the concerned Einecs and/or CAS numbers are used to identify forms of carbon or graphite at the nano-scale, which do not meet the criteria for inclusion in" Annex IV.   We first posted on this possibility last June.

Commission Regulation (EC) NO 987/2008 of 8 October 2008 Amending Regulation (EC) No 1907/2006 of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) as regards Annexes IV and V.

This decision is consistent with the U.S. Environmental Protection Agency's reasoning that nanoscale substances with new molecular identities -- such as fullerenes and carbon nanotubes -- are considered new chemical substances for purposes of premanufacturing notice submissions under the Toxic Substances Control Act.
 

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Last month we reported on a press release by Thomas Swan & Co. Ltd. of the United Kingdom indicating the company had recently entered into a PMN consent order with the EPA under the Toxic Substances Control Act (“TSCA”) concerning one of its multi-walled carbon nanotube (MWCNT) products. Barring an unusual coincidence, it appears that EPA has recently published a redacted version of the Swan Consent order here.

The order makes it clear that the PMN was submitted pursuant to § 5(a)(1) of TSCA, and that it covers a MWCNT product. Additionally, the consent order places several requirements on the manufacturer. Specifically, the manufacturer is required to:

1. Deliver 1 gram of the MWCNTs to EPA with a copy of MSDS for the product;
2. Conduct “90 day inhalation toxicity study in rats with a post exposure; observation period of up to 3 months, including bronchoalveolar lavage fluid (“BALF”) analysis (OPPTS 870.3465 or OECD 413);
3. Submit material characterization data within six months (see below);
4. Ensure employees “use gloves impervious to nanoscale particles and chemical protective clothing;” and
5. Ensure employees “use a NIOSH-approved full-face respirator with an N-100 cartridge while exposed by inhalation in the work area.”

Regarding the second requirement, the consent order also provides the manufacturer with an opportunity to submit toxicity testing data under the Agency’s new Nanoscale Material Stewardship Program as an alternative to the 90 day mouse inhalation test: “If, for example, a consortium of companies commit to testing a representative set of MWCNT for subchronic mammalian toxicity, EPA may consider waiving the triggered testing requirement. EPA would be willing to facilitate the process in coordination with other ongoing health effects testing for MWCNT nationally and internationally. EPA would consider accepting the results of such testing in lieu of triggered testing in this order.”
 

Regarding material characterization information, EPA is requiring the manufacturer to submit the following within six months:

• Type of multi-walled carbon nanotube (concentric cylinders or scrolled tubes; number of walls/tubes);
• Configuration of nanotube ends (e.g., open, capped);
• Description of any branching;
• Width/diameter of inner most wall/tube (average and range);
• Carbon unit cell ring size and connectivity;
• Alignment of nanotube along long axis (straight, bent, buckled);
• Hexagonal array orientation used in the manufacture of the nanotube;
• Particle size of catalyst used in the manufacture of the nanotube;
• Molecular weight (average and range); and
• Particle properties: shape, size (average and distribution), weight (average and distribution), count, surface area (average and distribution), surface to volume ratio, aggregation/agglomeration.

Finally, manufacturers of MWCNTs (other than Thomas Swan) will be interested in two of EPA’s general legal conclusions expressed in the consent order:

“EPA is unable to determine the potential for human health effects from exposure to the PMN substance. EPA therefore concludes, pursuant to § 5(e)(1)(A)(i) of TSCA, that the information available to the Agency is insufficient to permit a reasoned evaluation of the human health effects of the PMN substance.”

“In light of the potential risk to human health posed by the uncontrolled manufacture, import, processing, distribution in commerce, use, and disposal of the PMN substance, EPA has concluded, pursuant to § 5(e)(1)(A)(ii)(I) of TSCA, that uncontrolled manufacture, import, processing, distribution in commerce, use, and disposal of the PMN substance may present an unreasonable risk of injury to human health.”

No doubt other MWCNT manufacturers will feel the need to file PMN’s for their products similar to Thomas Swan given the language of the consent order.

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A February 2008 study published by six Stanford scientists examined the long term fate of intravenously injected carbon nanotubes in mice.   The scientists' goal was to measure the circulation of SWCNTs in the bloodstream and to determine whether they accumulate in organs and/or tissues.  At the same time, the scientists also studied the effects of functionalizing SWCNTs with polymers.  They found that functionalizing the SWCNTs with polyethyleneglycol enabled full blood circulation in 1 day, yet there was little uptake by the liver and spleen.  Additionally, near complete clearance from main organs occurred in about two months through the excretion of urine and feces.  No toxic side effects were observed.   The authors further found that the SWCNTs became more biologically inert as they increased the number of functionalized polymer branches. 

The scientists concluded that this and other studies "provide a strong indication of the lack of toxicity of well functionalized SWNTs in mice before clearance from the body. In contrast to a previous study of nonfunctionalized pristine carbon nanotubes causing fiber toxicity to mice, our well functionalized SWNTs are highly biocompatible for in vivo applications."

Z. Liu, et al., "Circulation and long-term fate of functionalized, biocompatible single-walled carbon nanotubes in mice probed by Roman spectroscopy," PNAS, Vol. 105, No. 5 at 1410-1415 (February 5, 2008).
 

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There have been a number of articles published since May 20 regarding a possible link between carbon nanotubes and the development of precursors of mesothelioma because of a recent letter published in Nature Nanotechnology.

C. Poland, et al., "Carbon nanotubes introduced into the abdominal cavity of mice show asbestos-like pathology in a pilot study," Nature Nanotechnology, May 20, 2008.

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Researchers at the Georgia Institute of Technology (Georgia Tech) have discovered that multi walled carbon nanotubes will remain suspended in water for a month or longer when combined with other organic materials.  The January issue of the journal Environmental Science & Technology , will fully report the findings by Assistant Professor Jaehong Kim, Professor Joseph Hughes, researcher John Fortner, and graduate student Hoon Hyung.  However, the initial conclusion from the experiments is that multi walled carbon nanotubes are easily dispersed throughout the environment due to their extended suspension in river water.  The nanotubes interacted with the organic material found in water from the Suwannee River, and as a result, remained suspended in the water.  As reported by Georgia Tech,  "Carbon nanotubes, which can be single- or multiwalled, are cylindrical carbon structures with novel properties that make them potentially useful in a wide variety of applications including electronics, composites, optics and pharmaceuticals."

This, of course, adds to the body of science regulators are looking to as the try to develop sound policy for governing nanotechnology.  Check back for updates as the full report on the experiment is released.

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