PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Ammonium sulfite monohydrate 7783-11-1
11.01
15.01
15.02
4.07
Formula Synonyms
(N.H4)2.S.O3.H2.O
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
134.156 S 1.41
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
30 330 2000
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
5.5 60 360
Technical Basis
A review of available sources did not identify exposure limits, acute toxicity data, or health hazard ratings for ammonium sulfite monohydrate. A similar chemical, ammonium sulfite (CASRN: 10196-04-0) reports GHS health hazard ratings (H314, H315, H319, H335, Category 1-3) indicate a high to mid-level health hazard, approximately equivalent to an HHR between 2 and 3. However, ammonium sulfite does not meet GHS hazard criteria in 68% of surveyed reports. Considering this, the PNOS TLV-TWA was selected as the TEEL-1 basis (PNOS, Section 3.5.2). TEEL-3 and TEEL-2 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TLV-TWA (PNOS, 10 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-1 x 11
• PAC-3 = TEEL-3 = TEEL-2 x 6
This review generated PAC values that are consistent with Rev. 29A*.
References
Chemical information: https://comptox.epa.gov/dashboard/chemical/details/DTXSID201043487
Ammonium sulfite (CASRN: 10196-04-0) chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-Sulfite
PNOR/PNOS TLV-TWA: https://www.osha.gov/chemicaldata/801
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.