Agent Name

Oxalic acid, anhydrous

CAS Number

144-62-7

Formula

C2-H2-O4

Major Category

Other Classes

Synonyms

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]

Category

Organic Acids

Description

Colorless, odorless powder or granular solid. [Note: The anhydrous form (COOH)2 is an odorless, white solid.]; [NIOSH]

Sources/Uses

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]

Comments

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

EPA Pesticide Chemical Search

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

1 mg/m3

STEL (ACGIH)

2 mg/m3

PEL (OSHA)

1 mg/m3

IDLH (NIOSH)

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

Adverse Effects
Toxic Pneumonitis

Yes

Hepatotoxin

Hepatotoxin, Secondary

Dermatotoxin

Skin Burns

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Industrial Processes with risk of exposure:

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