Oxalic acid, anhydrous

Agent Name
Oxalic acid, anhydrous
CAS Number
Major Category
Other Classes
Oxalic acid, anhydrous formula graphical representation
Acide oxalique [French]; Acido ossalico [Italian]; Acidum oxalicum; Aktisal; Aquisal; Ethanedioic acid; Kyselina stavelova [Czech]; Oxaalzuur [Dutch]; Oxalate; Oxalic acid; Oxalsaeure [German]; Oxiric acid; [ChemIDplus] Dicarboxylic acid; [ACGIH]
Organic Acids
Colorless, odorless powder or granular solid. [Note: The anhydrous form (COOH)2 is an odorless, white solid.]; [NIOSH]
Used in metal cleaning, chemical synthesis, dye and rubber manufacturing, and textile stripping/finishing; Also used as a disinfectant (swimming pool and drainage system) and bathroom sanitizer; [ACGIH] Several species of plants contain soluble and insoluble oxalate salts. [Olson, p. 360] Used in photography (toner and platinum printing); Also used as a mordant in textile dyeing; [www.ci.tucson.az.us/arthazards/medium.html]
Liquid causes second or third degree burns after short contact. [CHRIS] TLV Basis is irritation (eye, skin and upper respiratory tract); [ACGIH] Solutions range from irritating to corrosive. Inhalation of high concentrations may induce chemical pneumonitis. Ingestion of oxalic acid or soluble oxalate compounds causes acute hypocalcemia and deposition of calcium oxalate crystals in the brain, heart, kidney, and other organs. In plant poisoning cases, ingestion of insoluble oxalate compounds causes irritation and swelling of the mouth, throat, and esophagus. [Olson, p. 360-1] A corrosive substance that can cause pulmonary edema after inhalation of aerosol; [ICSC] May cause kidney damage, hypocalcemia, and hepatic necrosis in severe poisoning cases following ingestion; [HSDB]
Reference Link #1
Biomedical References

Exposure Assessment

Skin Designation (ACGIH)
Insufficient data
1 mg/m3
2 mg/m3
1 mg/m3
500 mg/m3
Excerpts from Documentation for IDLHs
Human data: It has been reported that the lethal oral dose is 15 to 30 grams [Webster 1930]. [Note: An oral dose of 15 to 30 grams is equivalent to a 30­minute exposure to 10,000 to 20,000 mg/m3 assuming a 50 liter per minute breathing rate and 100% absorption.]
Vapor Pressure
0.000234 mm Hg
Explanatory Notes
VP = 0.54 mm Hg @ 105 deg C; [HSDB]
must be preheated

Adverse Effects

Toxic Pneumonitis
Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion
Skin burns

Diseases, Processes, and Activities Linked to This Agent


Activities with risk of exposure: