PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammonium thiosulfate; (Ammonium hyposulfite) | 7783-18-8 | 8027 |
15.01
11.01
15.02
4.05
7.01
8.00
11.00
4.09
7.00
4.06
|
|||||||||
| Formula | Synonyms | |||||||||||
| H8N2O3S2 | AMMONIUM THIOSULFATE, AMMO HYPO, AMMONIUM HYPOSULFITE, AMMONIUM THIOSULFATE ((NH4)2S2O3), DIAMMONIUM THIOSULFATE, NA 9093, THIO-SUL, THIOSULFURIC ACID, DIAMMONIUM SALT, AMMONIUM THIOSULFATE SOLUTION (60% OR LESS) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 148.22 | S | 1.679 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.4 | 16 | 94 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 8.5 | 97 | 570 |
Technical Basis
Analysts used toxicity data, applying Table 3.4 and Table 3.5, converged on same values:
TEEL-1 = TEEL-2/11
TEEL-2 = TEEL-3/6
TEEL-3: LD50, Rat, Oral, Dose = 2890 mg/kg
Toxicity data from the Labor Hygiene and Occupational Diseases (LD50, rat oral) was used.
Analysts used same methods and starting point data (LD50, rat, oral, dosage=2890 mg/kg).
This resulted in more conservative values than those listed from Rev 29A. The review results recommend a revision from the values in Rev 29A.
TEELs were rounded to two significant figures and converted from referenced units to either ppm or mg/m3, providing both values.
TEEL-1 = TEEL-2/11
TEEL-2 = TEEL-3/6
TEEL-3: LD50, Rat, Oral, Dose = 2890 mg/kg
Toxicity data from the Labor Hygiene and Occupational Diseases (LD50, rat oral) was used.
Analysts used same methods and starting point data (LD50, rat, oral, dosage=2890 mg/kg).
This resulted in more conservative values than those listed from Rev 29A. The review results recommend a revision from the values in Rev 29A.
TEELs were rounded to two significant figures and converted from referenced units to either ppm or mg/m3, providing both values.
References
Temporary Emergency Exposure Limits for Chemicals: Methods and Practice (DOE-HDBK-1046-2016)
https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-thiosulphate#section=Toxicity
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases., 26(6)(54), 1982