IRIS Toxicological Review of Acrylonitrile (2011 External Review Draft)

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Federal Register Notices

Contact

Ambuja Bale: by phone at: 703-347-8643; by fax at: 703-347-8689; by email at: bale.ambuja@epa.gov

[UPDATE] New Schedule for IRIS Acrylonitrile Assessment

In May 2012, EPA developed a new schedule for completing the IRIS acrylonitrile assessment. This new schedule can be found on IRIS Track (IRISTrack - Acrylonitrile). Acrylonitrile is primarily used in the manufacture of acrylic and modacrylic fibers, plastics, and nitrile rubbers. It is also used as an intermediate in the production of other chemicals.

In June 2011, EPA released its draft IRIS assessment for acrylonitrile for public comment and external peer review (Federal Register Notice Jun 30, 2011). A public listening session for the draft acrylonitrile assessment was held on August 10, 2011.

EPA has decided to make further revisions to the acrylonitrile assessment to more fully address scientific issues in the assessment. The revised draft acrylonitrile assessment will be released for public comment and rigorous, independent expert peer review. EPA will seek to have the peer review performed by the new Chemical Assessment Advisory Committee that is being formed under the auspices of the Science Advisory Board.

Downloads/Related Links

This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.

IRIS Toxicological Review of Acrylontrile (External Review Draft) (PDF) (651 pp, 4 MB, about PDF)
Charge to External Peer Reviewers (PDF) (4 pp, 77 KB, about PDF)
Acrylonitrile Physiologically Based Pharmacokinetic (PBPK) Modeling Code (ZIP) (598 KB, about ZIP)

Background

The draft Toxicological Review of Acrylonitrile provides scientific support and rationale for the hazard and dose-response assessment pertaining to chronic exposure to acrylonitrile. Acrylonitrile is widely used in the production of acrylic fibers, plastics (acrylonitrile butadiene styrene and acrylonitrile-styrene resins), and nitrile rubbers, and as an intermediate in the production of other chemicals.

History/Chronology

Sep 1987	The cancer assessment for acrylonitrile was posted to the IRIS database.
Nov 1991	The inhalation RfC for acrylonitrile was posted to the IRIS database.
Mar 2010	EPA hosted an interagency science consultation on the review of the draft Toxicological Review of Acrylonitrile.
Jun 2010	Following a report from the National Toxicology Program, EPA placed the draft Acrylonitrile Toxicological Review on hold. (See June 15, 2010 press release)
Jun 2011	EPA hosted a second interagency science consultation on the review of the selected sections and highlights to the external peer review draft of the Toxicological Review of Acrylonitrile.
Jun 2011	EPA released the external review draft of the acrylonitrile assessment for public review and comment. [Federal Register Notice Jun 30, 2011]
Aug 2011	EPA announced a 30-day extension of the public comment period for the document, IRIS Toxicological Review of Acrylonitrile (External Review Draft) (EPA/635/R-08/013A). The comment period closed on September 28, 2011. [Federal Register Notice Aug 31, 2011]
Sep 2011	EPA announced the availability of additional documentation for the acrylonitrile physiologically based pharmacokinetic (PBPK) model (Zip file under downloads). This documentation supplements Appendix C of the IRIS Toxicological Review of Acrylonitrile (External Review Draft).

Next Steps

This draft has been archived.

Citation

U.S. EPA. IRIS Toxicological Review of Acrylonitrile (2011 External Review Draft). U.S. Environmental Protection Agency, Washington, DC, EPA/635/R-08/013A, 2011.