PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Quinhydrone 106-34-3
15.01
11.01
15.02
Formula Synonyms
C12H10O4
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
220.24 S 171 1.4
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.68 7.4 45
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.075 0.82 5.0
Technical Basis
various routes (oral, intravenous, intraperitoneal). 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 most preferred species and data type, a rat oral LD50, was selected as the TEEL-3 basis. TEEL-1 and TEEL-2 values were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat oral LD50 (225 mg/kg)
This review generated TEEL values that are inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat intravenous LD50, while the recommended TEEL-3 basis is a higher priority route (oral > intravenous). The Rev. 29A and current TEEL-1 and TEEL-2 bases remain consistent, with differences due to the change in the TEEL-3 basis.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Quinhydrone
Rat oral LD50 (225 mg/kg): Federation Proceedings, Federation of American Societies for Experimental Biology., 8(348), 1949. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Quinhydrone
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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.