PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Barium chromate | 10294-40-3 |
15.01
11.01
11.00
4.07
9.00
2.00
10.00
3.09
3.11
3.12
|
||||||||||
| Formula | Synonyms | |||||||||||
| BaCrH2O4 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 255.36 | S | 1380 | 4.498 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0028 | 0.46 | 76 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.00027 | 0.044 | 7.3 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for barium chromate. Analysts evaluated exposure limits for chromic acid and chromates/chromium(VI) compounds for TEEL development. The 1990 IDLH for chromic acid and chromates (as chromium trioxide) was selected as the TEEL-3 basis, the PEL-C was selected as the TEEL-2 basis, and the TLV-TWA was selected as the TEEL-1 basis. A compound adjustment factor was applied (Section 3.2.2) to these exposure limits.
• TEEL-1 = MW-adjusted TLV-TWA (chromium(VI) compounds, CASRN:18540-29-9; 0.0002 mg/m3) x 3
• TEEL-2 = MW-adjusted PEL-C(chromium(VI) compounds, CASRN:18540-29-9; 0.1 mg/m3)
• TEEL-3 = MW-adjusted IDLH (1990, chromic acid and chromates, CASRN:18540-29-9; 30 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 source and methodology are consistent; therefore, differences may be due to rounding. The Rev. 29A TEEL-2 and TEEL-1 values were derived from the TEEL-3, while the current TEEL-2 and TEEL-1 bases are exposure limits for chromium(VI) compounds (TLV-TWA and PEL-C, respectively) adjusted for differences in molecular weight.
• TEEL-1 = MW-adjusted TLV-TWA (chromium(VI) compounds, CASRN:18540-29-9; 0.0002 mg/m3) x 3
• TEEL-2 = MW-adjusted PEL-C(chromium(VI) compounds, CASRN:18540-29-9; 0.1 mg/m3)
• TEEL-3 = MW-adjusted IDLH (1990, chromic acid and chromates, CASRN:18540-29-9; 30 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 source and methodology are consistent; therefore, differences may be due to rounding. The Rev. 29A TEEL-2 and TEEL-1 values were derived from the TEEL-3, while the current TEEL-2 and TEEL-1 bases are exposure limits for chromium(VI) compounds (TLV-TWA and PEL-C, respectively) adjusted for differences in molecular weight.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Barium-chromate
Chromium(VI) compound exposure limits (TLV-TWA, PEL-C): https://www.osha.gov/chemicaldata/537
Chromium acid and chromate (as CrO3) IDLH: https://www.cdc.gov/niosh/idlh/1333820.html