Richard Denison, Ph.D., is a Senior Scientist.

In June, EPA published a Federal Register notice that included Significant New Use Rules (SNURs) for two carbon nanotubes (as well as 21 other chemicals).  That notice certainly got the attention of lawyers in town (see here, here and here).  The nanotube SNURs would require anyone planning to produce or process either of the two substances to notify EPA if the person intended not to comply with the (rather limited) risk management conditions specified by EPA.  Well, as reported yesterday by Sara Goodman of E&E News, EPA is now withdrawing the SNURs, at least temporarily.   

[Note:  Since first posting this Friday, I have made a few changes.  In first writing this post, I let show too much my frustration over the fact that even the smallest of steps taken by EPA to ensure some review of nanomaterials prior to their commercialization appears to have engendered an industry challenge.  In a few places, I got too personal and took some gratuitous swipes I shouldn't have.  I apologize for that, and have taken those out.] Read more »

Richard Denison, Ph.D., is a Senior Scientist.

In earlier posts (here and here), I discussed a notice EPA had received in July of 2008 from BASF reporting toxic effects at very low doses of a carbon nanotube (CNT) observed in a 90-day rat inhalation study.  In that notice, BASF had declared the specific identity of its CNT to be confidential business information, hence denying that information to the public.  Now, in a setting more to its liking, it appears the company has decided to reveal the identity after all. Read more »

Richard Denison, Ph.D., is a Senior Scientist.

Some months ago, my colleague John Balbus posted here about studies finding that when multi-walled carbon nanotubes (MWCNTs) are injected into the abdominal cavities of mice, they induce inflammation and mesothelioma-like reactions similar to those caused by asbestos.  He appropriately cautioned that – among other critical questions – these studies had not demonstrated that inhaled MWCNTs could actually move out of the lung and into the tissues where asbestos gives rise to its effects.  Well, that particular dot now appears to have been connected. Read more »

Richard Denison, Ph.D., is a Senior Scientist.

It had to happen sooner or later. After several years spent by the UK and US governments conceptualizing, vetting, proposing, again vetting, developing, yet again vetting, and finally launching and reporting on their voluntary reporting programs for engineered nanoscale materials – only to have them largely spurned by the intended targets – other governments observing all this have decided that mandatory approaches are needed. Read more »

Richard Denison, Ph.D., is a Senior Scientist.

In some nanotechnology circles, it is almost a mantra that, once released to the environment, nanoparticles will inevitably aggregate or agglomerate into larger masses and thereby lose their nanoscale-related properties and, by implication at least, any associated risks.

But can we count on nanoparticles released to the environment to self-regulate their own risk so conveniently? Read more »

Cal Baier-Anderson, Ph.D., is a Health Scientist.

Can nanoparticles get into our drinking water and if so, what’s the harm?

Nanoparticles are being used in cosmetics and other personal care products with increasing frequency.  Carbon fullerenes, also known as buckyballs, have recently been touted as imparting age-defying antioxidant benefits when added to skin cream.  And there are some studies that seem to support these claims.  But even if such claimed benefits turn out to be true, this is by no means the end of the story.  Read more »

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 »