PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammonium ferrous sulfate hexahydrate | 7783-85-9 |
15.01
11.01
15.02
4.09
4.07
4.10
11.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| FeH16N2O14S | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 356.09 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 21 | 110 | 640 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.4 | 7.6 | 44 |
Technical Basis
A review of available sources identified a rat oral LD50 that was selected as the TEEL-3 basis and evaluated using factors in Tables 3.2, 3.3, and 3.4. In addition, analysts evaluated exposure limits for iron soluble salts (CASRN: 7439-89-6) for TEEL development. The TEEL-2 value was derived according to Table 3.5. The TLV-TWA for iron soluble salts was selected as the TEEL-1 basis and a compound adjustment factor was applied (Section 3.2.2).
• PAC-1 = TEEL-1 = MW-adjusted TLV-TWA (soluble iron salts, CASRN: 7439-89-6; 1 mg/m3)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (3250 mg/kg)
This review generated PAC-3 and PAC-2 values consistent with Rev. 29A, and an inconsistent PAC-1 value. The Rev. 29A and current TEEL-3 and TEEL-2 source and methodologies are consistent. The Rev. 29A and current TEEL-1 use the same methodology, a weight adjusted TLV-TWA for iron soluble salts; it is unclear why the values are different.
• PAC-1 = TEEL-1 = MW-adjusted TLV-TWA (soluble iron salts, CASRN: 7439-89-6; 1 mg/m3)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (3250 mg/kg)
This review generated PAC-3 and PAC-2 values consistent with Rev. 29A, and an inconsistent PAC-1 value. The Rev. 29A and current TEEL-3 and TEEL-2 source and methodologies are consistent. The Rev. 29A and current TEEL-1 use the same methodology, a weight adjusted TLV-TWA for iron soluble salts; it is unclear why the values are different.
References
Chemical information: https://www.sigmaaldrich.com/US/en/substance/ammoniumironiisulfatehexahydrate392147783859
Rat LD50. American Industrial Hygiene Association Journal., 30(470), 1969 [PMID:5823428]. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/substance/135175798.
TLV-TWA for iron salts, soluble (as Fe) (CASRN: 7439-89-6): https://www.osha.gov/chemicaldata/499