PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammonium hydrogen oxalate hemihydrate | 37541-72-3 |
4.00
3.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| C4H10N2O8H2O | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 232.146 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 120 | 1300 | 7900 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 13 | 140 | 830 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for ammonium hydrogen oxalate hemihydrate. Reported GHS health hazard ratings (H302 and H312, Category 4) indicate a low-level health hazard, approximately equivalent to an HHR=1. Analysts assumed an HHR=1 as the TEEL-3 basis (Section 3.4.5). TEEL-2 and TEEL-1 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=1
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=1, from analysis of GHS health hazard statements, from which TEEL-2 and TEEL-1 were derived (Table 3.5).
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=1
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=1, from analysis of GHS health hazard statements, from which TEEL-2 and TEEL-1 were derived (Table 3.5).
References
Chemical information and GHS health hazard ratings retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/71310010