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Merphos Quickview (CASRN 150-50-5)

Health assessment information on a chemical substance is included in IRIS only after a comprehensive review of toxicity data by U.S. EPA health scientists from several Program Offices, Regional Offices, and the Office of Research and Development.

Disclaimer: This QuickView represents a snapshot of key information. We suggest that you read the IRIS Summary to put this information into complete context.

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Status of Data for Merphos

File First On-Line: 09/07/1988; Last Significant Revision: 11/01/1992

Category (section)
Last Revised
Oral RfD Assessment Yes 09/07/1988
Inhalation RfC Assessment Message 11/01/1992
Carcinogenicity Assessment No
  • 150-50-5
  • Chemagro b-1776
  • Deleaf defoliant
  • Easy Off-D
  • Folex
  • Merphos
  • Phosphorotrithious acid, tributyl ester
  • Phosphorotrithious acid, s,s,s-tributyl ester
  • s,s,s-Tributyl phosphorotrithioite
  • s,s,s-Tributyl trithiophosphite
  • Tributyl phosphorotrithioite
  • Tributylthiofosfin
Merphos Source Documents
Revision History
Date Section Description
04/01/1997 III., IV.,V. Dring Water Health Advisories, EPA Regulatory Actions, and Supplementary data were removed from IRIS on or before April 1997. IRIS users were directed to the appropriate EPA Program offices for this information.
Chronic Health Hazard Assessments for Noncarcinogenic Effects

Reference Dose for Chronic Oral Exposure (RfD)

Critical Effect
Point of Departure*
Ataxia, delayed neurotoxicity and weight loss NOEL : 1 x10-1 mg/kg-day 3000 3 x10-5 mg/kg-day

* The Point of Departure listed serves as a basis from which the Oral RfD was derived. See Discussion of Conversion Factors and Assumptions for more details.

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Reference Concentration for Chronic Inhalation Exposure (RfC)

Information reviewed but value not estimated. See IRIS Summary.

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Carcinogenicity Assessment for Lifetime Exposure

Quantitative Estimate of Carcinogenic Risk from Oral Exposure

  • Not Assessed under the IRIS Program.

Quantitative Estimate of Carcinogenic Risk from Inhalation Exposure

  • Not Assessed under the IRIS Program.

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