PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Thallium(III) oxide; (Thallium sesquioxide; Thallic oxide) 1314-32-5
4.07
4.05
4.11
3.11
7.01
7.00
4.06
Formula Synonyms
O3Tl2 THALLIC OXIDE
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
456.77 S 834 10.2
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.18 2.0 8.7
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.0096 0.11 0.47
Technical Basis
A review of available sources identified a LOC and acute toxicity (LD50, LDLo) for several species and routes. In addition, analysts considered exposure limits for thallium (Tl, CASRN: 7440-28-0, IDLH) for TEEL development; the IDLH is designated as appropriate for soluble thallium compounds; as such, it was not further evaluated because thallium(III) oxide is insoluble. 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. Analysts selected the most preferred species and route toxicity data, a rat oral LD50, as the TEEL-3 basis. The LOC was selected as the TEEL-2. The TEEL-1 value was derived according to Table 3.5
• TEEL-1 = TEEL-2/11
• TEEL-2 = LOC (0.002 g/m3)
• TEEL-3 = Rat oral LD50 (44 mg/kg)
This review generated TEEL values that are consistent with Rev. 29A.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Thallic-oxide
Thallium(III) oxide solubility, see pgs. 3-4 and Table 2-1: https://iris.epa.gov/static/pdfs/1012tr.pdf
Rat LD50. American Industrial Hygiene Association Journal., 21(399), 1960 [PMID:13724164]. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Thallic-oxide
LOC. Appendix C, pg. C-9: https://www.epa.gov/sites/default/files/2015-09/documents/technical_guidance_for_hazard_analysis.pdf
IDLH, soluble thallium compounds: https://www.cdc.gov/niosh/idlh/thallium.html
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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.