SODIUM METABISULFITE
| Chemical Identification | |
|---|---|
| CAS # | 7681-57-4; 7757-74-6 |
| Formula |
H₂O₅S₂.₂Na |
| Synonyms |
disodium pyrosulfite; sodium metabisulphite; sodium pyrosulfite |
| Physical Properties | |||
|---|---|---|---|
| Physical description | White to yellowish crystals or powder with a slight odor of sulfur. | ||
| Boiling point | decomposes | Molecular weight | 190.1 |
| Freezing point/melting point | >302°F (decomposes) | Vapor pressure | |
| Flash point | Vapor density | ||
| Specific gravity | 1.4 | Ionization potential | |
| Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
| NFPA health rating | NFPA fire rating | ||
| NFPA reactivity rating | NFPA special instruction | ||
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Monitoring Methods Used by OSHA | ||||||
|---|---|---|---|---|---|---|
| Analyte code (IMIS no.) | S112 | |||||
| Sampling group | ||||||
| Sampler/Sampling media | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0] | |||||
| Sampling time* | 240-480 min |
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| Sampling volume (TWA)* | 480-960 L |
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| Sampling flow rate (TWA)* | 2 L/min |
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| Sampling volume (STEL/Peak/C)* | ||||||
| Sampling flow rate (STEL/Peak/C)* | ||||||
| Analytical method instruments | AAS/AES | |||||
| Method reference | OSHA ID-121 (fully validated) | |||||
| Notes | Results will be reported from the elemental analysis for the element only; the stated identity of the actual sample contents is based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes. An elemental result provided may be converted to the desired compound by multiplying the result by the appropriate stoichiometric factor. A 91B report specific to the compound (including the stoichiometric conversion) may by be provided upon request by contacting the laboratory. The stoichiometric factor for sodium metabisulfite from sodium is 4.135. Analysis for this analyte is based on water solubility. |
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| Special requirements | ||||||
* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
| Wipe Method | |
|---|---|
| Sampler/Sampling media | |
| Bulk Method |
|---|
| On-Site Screening Techniques | ||||||
|---|---|---|---|---|---|---|
| Device | ||||||
| Model/Type | ||||||
|
Sampling information (see manufacturer instructions) |
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| Exposure Limits | |||||||
|---|---|---|---|---|---|---|---|
|
OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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| PEL-TWA | REL-TWA |
5 mg/m³ |
TLV-TWA |
5 mg/m³ [1992] |
PEL-TWA |
5 mg/m³ |
|
| PEL-STEL | REL-STEL | TLV-STEL | PEL-STEL | ||||
| PEL-C | REL-C | TLV-C | PEL-C | ||||
| Skin notation |
NA |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
|
Notes:
Not established |
Notes: | Notes: | Notes: | ||||
| Health factors: See NIH-NLM PubChem. | IDLH | ||||||
| Carcinogenic classifications: TLV-A4 | Notes: | ||||||
| AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: | |||||||
| Additional Resources and Literature References |
|---|
|
NOAA: CAMEO Chemicals - Sodium metabisulfite NIOSH: Pocket Guide to Chemical Hazards - Sodium metabisulfite Literature References
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Last Updated Date : 01/12/2021