OXALIC ACID†

Chemical Identification
Chemical Identification
CAS # 144-62-7
Formula

C₂H₂O₄

Synonyms

ethanedioic acid; oxalic acid (aqueous); oxalic acid dihydrate

Physical Properties
Physical Properties
Physical description Colorless, odorless powder or granular solid.
Boiling point sublimes Molecular weight 90.04
Freezing point/melting point 372°F Vapor pressure <0.001 mmHg
Flash point Vapor density 4.3
Specific gravity 1.90 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 1
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1970
Sampling group
Sampler/Sampling media GFF (37 mm), Type A/B [SKC 225-701]
Sampling time*

100 min

Sampling volume (TWA)*

100 L

Sampling flow rate (TWA)*

1 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments IC
Method reference OSHA PV2115 (partially validated)
Notes

Sample open-faced!!

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
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
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
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

1 mg/m³

REL-TWA
 

1 mg/m³

TLV-TWA
 

1 mg/m³ [2014]

PEL-TWA
 

1 mg/m³

PEL-STEL
 

 

REL-STEL
 

2 mg/m³

TLV-STEL
 

2 mg/m³ [2014]

PEL-STEL
 

2 mg/m³

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

500 mg/m³

Carcinogenic classifications: Not listed Notes:
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Oxalic acid

NIOSH: Pocket Guide to Chemical Hazards - Oxalic acid

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Oxalic acid, anhydrous [144-62-7] and dihydrate [6153-56-6]. See annual publication for most recent information.
  • Chen, C.L., Chou, K.J., Wang, J.S., Yeh, J.H., Fang, H.C. and Chung, H.M.: Neurotoxic effects of carambola in rats: the role of oxalate. J. Formos. Med. Assoc. 101 (5): 337-441, 2002.
  • Pohanish, R.P. (editor): Oxalic Acid. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1763-1765.
  • Rofe, A.M., James, H.M., Bais, R., Edwards, J.B. and Conyers, R.A.: The production of (14C) oxalate during the metabolism of (14C) carbohydrates in isolated rat hepatocytes. Aust. J. Exp. Biol. Med. Sci. 58 (2): 103-116, 1980.
  • Salinas, M.L., Ogura, T. and Soffchi, L.: Irritant contact dermatitis caused by needle-like calcium oxalate crystals, raphides, in Agave tequilana among workers in tequila distilleries and agave plantations. Contact Dermatitis 44(2): 94-96, 2001.
  • Tse, K.C., et al.: Star fruit intoxication in uraemic patients: case series and review of the literature. Intern. Med. J. 33 (7): 314-316, 2003.

Last Updated Date : 01/28/2021