PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mercury(II) oxide; (Mercuric oxide) | 21908-53-2 |
4.01
11.01
4.07
7.11
3.09
3.06
5.00
5.10
3.11
16.01
|
||||||||||
| Formula | Synonyms | |||||||||||
| HgO | MERCURIC OXIDE, [SOLID], C.I. 77760, CI 77760, HYDRARGYRUM OXID FLAV, MERCURIC OXIDE, MERCURIC OXIDE (HGO), MERCURIC OXIDE, RED, MERCURIC OXIDE, SOLID(DOT), MERCURIC OXIDE, YELLOW, MERCURIC OXIDES, RED AND YELLOW, MERCURY METAL: COLLOIDAL MERCURY, MERCURY MONOXIDE, MERCURY OXIDE, MERCURY OXIDE(HGO), MERCURY(2+) OXIDE, MERCURY(II) OXIDE, METALLIC MERCURY, NATURAL MONTROYDITE, QUICKSILVER, RED MERCURIC OXIDE, RED OXIDE OF MERCURY, RED PRECIPITATE, SANTAR, SANTAR M, YELLOW MERCURIC OXIDE, YELLOW OXIDE OF MERCURY, YELLOW PRECIPITATE | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 216.59 | S | 11.14 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.081 | 16 | 30 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0091 | 1.8 | 3.4 |
Technical Basis
A review of available sources identified a LOC for mercury(II) oxide and exposure data for mercury compounds (TLV-TWA, IDLH for non-alkyl compounds and inorganic compounds). Data sources were selected according to the hierarchy listed in Table 3.1. The IDLH was selected as the TEEL-3 basis. The TLV-TWA was selected as the TEEL-1 basis. These bases were scaled with a compound adjustment factor (Section 3.2.2). The LOC was selected as the TEEL-2.
• TEEL-1 = MW-adjusted TLV-TWA (0.025 mg/m¬3) x 3
• TEEL-2 = LOC
• TEEL-3 = MW-adjusted IDLH (1990, 28 mg/m3)
This review generated TEEL-3 and TEEL-2 values that are consistent with Rev. 29A. The Rev. 29A TEEL-1 basis was derived from the LOC, while the current TEEL-1 was derived from a TLV-TWA and resulted in a lower value.
• TEEL-1 = MW-adjusted TLV-TWA (0.025 mg/m¬3) x 3
• TEEL-2 = LOC
• TEEL-3 = MW-adjusted IDLH (1990, 28 mg/m3)
This review generated TEEL-3 and TEEL-2 values that are consistent with Rev. 29A. The Rev. 29A TEEL-1 basis was derived from the LOC, while the current TEEL-1 was derived from a TLV-TWA and resulted in a lower value.
References
https://www.cdc.gov/niosh/idlh/7439976.html
https://www.osha.gov/chemicaldata/504
Appendix C, pg. C-6. https://www.epa.gov/sites/default/files/2015-09/documents/technical_guidance_for_hazard_analysis.pdf
https://pubchem.ncbi.nlm.nih.gov/compound/Mercuric-oxide