Richard Denison, Ph.D., is a Senior Scientist.
My last post identified two Section 8(e) "substantial risk" notices pertaining to carbon nanotubes, one submitted by BASF, the other by Arkema. I have in my files one additional Section 8(e) notice for a single-walled carbon nanotube (SWCNT), submitted by DuPont. With three Section 8(e) notices submitted for different rat pulmonary toxicity studies on carbon nanotubes, it's interesting to compare their results. Read More
Richard Denison, Ph.D., is a Senior Scientist.
Section 8(e) of the Toxic Substances Control Act (TSCA) requires any company that manufactures, imports, processes or distributes chemicals in the U.S. to notify EPA within 30 days if it obtains new information that "reasonably supports the conclusion that such substance or mixture presents a substantial risk of injury to health or the environment." Are there Section 8(e) notices for nanomaterials? Read More
Cal Baier-Anderson, Ph.D., is a Health Scientist.
The manufacture of carbon nanotubes (CNTs) is a very complicated business. Different production processes leave behind different kinds of metal catalysts, which yield differences in physical and chemical – as well as toxicological – properties of the CNTs. Read More
Richard Denison, Ph.D., is a Senior Scientist.
Since my first post concerning EPA's Consent Order, I've been reflecting further on the management conditions it imposes – or, more accurately, on what conditions it doesn't impose. The Order's only such conditions address potential worker exposure. What about the rest of the nanomaterial's lifecycle? Read More
Richard Denison, Ph.D., is a Senior Scientist.
[Part II of this post is available here.]
Word hit the street today that EPA intends to make public a "sanitized" version of a Consent Order it has negotiated with a producer of multiwalled carbon nanotubes (MWCNTs). [A link will be provided once available.] We obtained a copy of the Order, which has redacted all information claimed confidential by the company involved. What can we learn from this well-scrubbed Order? Read More
John Balbus, M.D., M.P.H., is Chief Health Scientist.
At its most recent meeting a few weeks ago, the US Technical Advisory Group (TAG) to the International Standards Organization (ISO) Technical Committee on Nanotechnologies approved a motion to have ISO develop a Technical Report based on the EDF-Dupont Nano Risk Framework (NRF). Or to put it another way in acronym-laden Washington-speak, the US TAG to the ANSI-accredited ISO TC229 approved a TR based on the EDF-DD NRF. Read More
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