PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Sodium uranium oxide monohydrate; (Sodium uranate(VI) monohydrate) 10135-92-9
10.00
2.00
3.09
Formula Synonyms
Na2.U2.O7.H2.O
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
652.049 S
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.82 6.8 41
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.031 0.25 1.5
Technical Basis
A review of available sources did not identify exposure or acute toxicity data for sodium uranate(VI) monohydrate. There are available exposure limits (TLV-STEL, IDLH) for insoluble uranium (CASRN: 7440-61-1), which were used to develop TEELs. The TLV-STEL was selected as the TEEL-1 and the IDLH was selected as the TEEL-3 basis, with a compound adjustment factor applied (Section 3.2.2). The TEEL-2 was derived according to Table 3.5.
• TEEL-1 = MW-adjusted TLV-STEL (insoluble uranium, CASRN:7440-61-1, 0.6 mg/m3)
• TEEL-2 = TEEL-3/6
• TEEL-3 = MW-adjusted IDLH (1990, insoluble uranium, CASRN:7440-61-1, 30 mg/m3)
This review generated TEEL values consistent with Rev. 29A.
References
IDLH: https://www.cdc.gov/niosh/idlh/7440611.html
TLV-STEL: https://www.osha.gov/chemicaldata/544
Description, sodium diuranate: https://haz-map.com/Agents/1730
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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.