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 Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
8.7 95 570
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
1.4 16 94
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.
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
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