PHOSPHORIC ACID†
Chemical Identification | |
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CAS # | 7664-38-2 |
Formula |
H₃PO₄ |
Synonyms |
white phosphoric acid; orthophosphoric acid; metaphosphoric acid |
Physical Properties | |||
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Physical description | Thick, colorless, odorless, crystalline solid. | ||
Boiling point | 415°F | Molecular weight | 98 |
Freezing point/melting point | 108°F | Vapor pressure | 0.03 mmHg |
Flash point | Vapor density | ||
Specific gravity | 1.87 (pure) 1.33 (50% solution) | Ionization potential | |
Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
NFPA health rating | 3 | NFPA fire rating | 0 |
NFPA reactivity rating | 0 | NFPA special instruction | |
Vapor hazard ratio (VHR) | |||
Historical exceedance percentage | |||
Target organs |
Monitoring Methods Used by OSHA | ||||||
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Analyte code (IMIS no.) | 2085 | |||||
Sampling group | ||||||
Sampler/Sampling media | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) [MAWP037A0] | |||||
Sampling time* | 480 min |
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Sampling volume (TWA)* | 960 L |
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Sampling flow rate (TWA)* | 2 L/min |
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Sampling volume (STEL/Peak/C)* | 30 L |
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Sampling flow rate (STEL/Peak/C)* | 2 L/min |
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Analytical method instruments | IC | |||||
Method reference | OSHA ID-111 (partially validated) | |||||
Notes | If the filter is not overloaded, samples may be collected up to an 8-hour period. Within 1 hour after sampling, transfer the filter to a clean screw cap vial. Phosphoric and sulfuric acid may be submitted on the same filter; otherwise, submit as a separate filter. Large quantities of any one of the analytes can result in masking of the peaks of other analytes. |
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Special requirements |
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* 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 | |
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Sampler/Sampling media | Wipe with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm). [AAWP03700] |
Bulk Method |
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On-Site Screening Techniques | ||||||
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Device | ||||||
Model/Type | ||||||
Sampling information (see manufacturer instructions) |
Exposure Limits | |||||||
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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 |
1 mg/m³ |
REL-TWA |
1 mg/m³ |
TLV-TWA |
1 mg/m³ [1992] |
PEL-TWA |
1 mg/m³ |
PEL-STEL |
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REL-STEL |
3 mg/m³ |
TLV-STEL |
3 mg/m³ [1992] |
PEL-STEL |
3 mg/m³ |
PEL-C |
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REL-C |
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TLV-C |
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PEL-C |
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Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
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Notes:
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Notes:
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Health factors: See NIH-NLM PubChem. | IDLH |
1000 mg/m³ |
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Carcinogenic classifications: Not listed |
Notes:
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
3 mg/m³/30 mg/m³/150 mg/m³ |
Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Phosphoric acid NIOSH: Pocket Guide to Chemical Hazards - Phosphoric acid Literature References
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Last Updated Date : 01/08/2021