PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Methyl demeton methyl; (Phosphorothioic acid, O,O-dimethyl-S-(2-methylthio)ethyl ester) 2587-90-8
6.00
11.01
11.00
4.01
7.01
7.00
4.05
4.07
7.11
3.05
Formula Synonyms
C5H13O3PS2 PHOSPHOROTHIOIC ACID, O,O-DIMETHYL S-(2-(METHYLTHIO) ETHYL), 2-METHYLTHIOETHYL O,O-DIMETHYL PHOSPHOROTHIOATE, CEBETOX, CYMETOX, DEMEPHION, DEMEPHION-S, ETHANETHIOL, 2-(METHYLTHIO)-, O,O-DIMETHYL PHOSPHOROTHIOATE, ETHANETHIOL, 2-(METHYLTHIO)-, S-ESTER WITH O,O-DIMETHYL PHOS, ISONITOX, ISOTINOX, METHYL DEMETON METHYL, PHOSPHOROTHIOIC ACID,, TINOX
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
216.27 L 230 1.207 @ 20°C
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
1.8 20 120
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.20 2.3 14
Technical Basis
A review of available sources identified the following: a LOC and acute toxicity data for various routes and species. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. The LOC was selected as the TEEL-2. Although a dog oral LD¬50 was explored as a TEEL-3 basis, it was not selected because 1) the TEEL value was less than the LOC, and 2) the handbook prioritizes published exposure limits for developing TEELs (Section 3.1). Instead, TEEL-3 and TEEL-1 were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = LOC (0.02 g/m3)
• TEEL-3 = TEEL-2 x 6
This review generated TEEL values that are consistent with Rev. 29A.
References
Appendix C, pg. C-7 (as Phosphorothioic acid, O,O-dimethyl-S-(2-methylthio)ethyl ester). https://www.epa.gov/sites/default/files/2015-09/documents/technical_guidance_for_hazard_analysis.pdf
https://cameochemicals.noaa.gov/chemical/10009
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.