PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Thallium hydroxide 12026-06-1
4.01
4.08
4.05
7.01
7.00
4.09
4.04
4.10
4.07
11.00
Formula Synonyms
Tl-OH
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
221.39 S 7.44
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.065 3.6 22
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.0072 0.40 2.4
Technical Basis
A review of limited sources identified exposure limits (TLV-TWA, IDLH) for soluble thallium compounds. Data sources were selected according to the hierarchy listed in Table 3.1. The IDLH (1990) was selected as the TEEL-3 basis and the TLV-TWA as the TEEL-1 basis; a compound adjustment factor was applied to these exposure limits (Section 3.2.2). The TEEL-2 value was derived according to Table 3.5.
• TEEL-1 = MW-adjusted TLV-TWA (soluble thallium, CASRN: 7440-28-0, 0.2 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = MW-adjusted IDLH (1990, soluble thallium, CASRN: 7440-28-0, 20 mg/m3)
This review generated TEEL-3 and TEEL-1 values consistent with Rev. 29A. Minor differences in TEEL-2 values may be due to rounding.
References
IDLH (1990) for soluble thallium. Retrieved from: https://www.cdc.gov/niosh/idlh/thallium.html
TLV-TWA, 2009. Retrieved from: https://www.osha.gov/chemicaldata/521
General information: https://pubchem.ncbi.nlm.nih.gov/compound/Thallium-hydroxide
Description/physical properties (Table 1-1). Retrieved from: https://nepis.epa.gov/Exe/ZyPDF.cgi/9100RH6Z.PDF?Dockey=9100RH6Z.PDF
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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.