IRIS

1,2,4-Trimethylbenzene

CASRN 95-63-6 | DTXSID6021402

IRIS Toxicological Review of Trimethylbenzenes (External Review Draft)

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Overview

EPA is conducting a peer review of the scientific basis supporting the human health hazard and dose-response assessment of trimethylbenzenes that will appear in the Integrated Risk Information System (IRIS) database.

Citation

U.S. EPA. IRIS Toxicological Review of Trimethylbenzenes (External Review Draft). U.S. Environmental Protection Agency, Washington, DC, EPA/635/R-11/012Aa-Ab, 2012.

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Background

Trimethylbenzenes (TMB) are a mixture of three isomers: 1,2,3-, 1,2,4- and 1,3,5-TMB. TMBs are produced during petroleum refining, and 1,2,4-TMB makes up approximately 40% of a certain petroleum product (the C9 fraction) which is used as a component of gasoline. Because of this, vehicle emissions are a major source of TMBs. Other uses of TMBs include solvents in research and industry, dyestuff intermediate, paint thinner, and as a UV oxidation stabilizer for plastics.

History/Chronology

Date Description
01- Feb 2012 EPA hosted an interagency science consultation meeting on the review of the draft Toxicological Review of Trimethylbenzenes.
02- May 2012 EPA sent an abbreviated version of the toxicological review containing only information on 1,2,3-trimethylbenzene for Interagency Science Consultation at the recommendation of reviewers.
03- Jun 2012 EPA released the external peer review draft of the trimethylbenzenes assessment for public review and comment. [Federal Register Notice June 29, 2012]

Status

Following external peer review and public comment, the assessment will be revised taking into consideration the comments received. It will then undergo a final internal review by EPA and other federal agencies and White House offices. After completing the review it will be posted to the IRIS database.

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Download(s)

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.

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Document Related Link(s)


Federal Register Notices


Docket

Comments on the assessment may be submitted and reviewed using the Docket ID EPA-HQ-ORD-2012-0459

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Related Links

Critical Effect Systems

Developmental
Developmental

Hematologic
Hematologic

Nervous
Nervous

Respiratory
Respiratory

Chemical Structure for
1,2,4-Trimethylbenzene

1,2,4-Trimethylbenzene

Synonyms

  • asymmetrical trimethylbenzene
  • mesitylene
  • methylxylene
  • pseudocumene
  • psi-Cumene

    • more synonyms