PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hydrogen selenide | 7783-07-5 |
14.01
7.01
11.00
11.01
14.02
4.07
4.10
4.02
7.01
3.10
|
||||||||||
| Formula | Synonyms | |||||||||||
| H2Se | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 80.98 | G | -64 | -41.4 | 7600 | 23.4 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.045 | 0.11 | 0.33 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.15 | 0.36 | 1.1 |
Technical Basis
A review of available sources identified exposure limits for this chemical including an AEGL-2, AEGL-3, TLV-TWA, and an OEL-TWA (Germany). The AEGLs were selected as the TEEL-2 and TEEL-3 due to their priority among the emergency exposure limits (Section 1). Due to insufficient data, an AEGL-1 does not exist for this chemical, therefore the TWAs were investigated as the TEEL-1 basis. Using the TLV-TWA (0.05 ppm) resulted in a TEEL-1 > TEEL-2 therefore, the OEL-TWA (Germany) was selected as the TEEL-1 basis and derived according to Table 3.5.
• TEEL-1 = OEL-TWA (Germany; 0.015 ppm, 0.05 mg/m3)
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL values consistent with Rev. 29A. The Rev. 29A TEEL-1 source was a MAK-TWA, while the current TEEL-1 source is an OEL-TWA (Germany) of the same value. The minor difference in the Rev. 29A reported TEEL-2 value in units of mg/m3 may be due to conversion and rounding of this value, instead of use of the source value. Values in units of mg/m3 are reported as published in the technical support document Table 5-1, per handbook guidance (Section 3.4.7.2).
• TEEL-1 = OEL-TWA (Germany; 0.015 ppm, 0.05 mg/m3)
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL values consistent with Rev. 29A. The Rev. 29A TEEL-1 source was a MAK-TWA, while the current TEEL-1 source is an OEL-TWA (Germany) of the same value. The minor difference in the Rev. 29A reported TEEL-2 value in units of mg/m3 may be due to conversion and rounding of this value, instead of use of the source value. Values in units of mg/m3 are reported as published in the technical support document Table 5-1, per handbook guidance (Section 3.4.7.2).
References
AEGLs and Chemical information: Retrieved from Table 5-2 of the EPA Technical Support Document. https://www.epa.gov/aegl/hydrogen-selenide-results-aegl-program
OEL-TWA (Germany): https://ilv.ifa.dguv.de/limitvalues/33529
TWAs: https://www.osha.gov/chemicaldata/653