Chromium dioxide

Synonyms

Accrox C; Accrox R; Chromium dioxide (CrO2); Chromium oxide (CrO2); Chromium(IV) oxide; Magtrieve; [ChemIDplus] Chromium [VI] dioxide; [IARC]

Category

Chromium Compounds, Inorganic

Description

Brown to black powder; [HSDB] The needle-like crystals are strongly magnetic; [Hawley] Insoluble in water; [ACGIH]

Sources/Uses

Used in magnetic tapes for recording, in ceramics, as a catalyst, and in special polishing operations; [HSDB]

Comments

CrVI compounds are irritants, sensitizers, and may be corrosive to the skin. CrVI compounds are respiratory tract irritants and may cause pulmonary sensitization. CrVI may cause acute tubular necrosis and liver injury. [ATSDR Case Studies] "There is sufficient evidence in humans for the carcinogenicity of chromium [VI] compounds as encountered in the chromate production, chromate pigment production and chromium plating industries." [IARC] See "Chromium" and linked occupational diseases.

Biomedical References

0.0002 mg/m3, as Cr(VI), inhalable particulate matter

0.0005 mg/m3, as Cr(VI), inhalable particulate matter

0.005 mg/m3, as Cr(VI)

Explanatory Notes

mp = 300 deg C, minus oxygen; [HSDB]

Yes

Yes

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

Yes

Skin burns

Established

Human carcinogen

Confirmed Human

Diseases

Occupational diseases associated with exposure to this agent:

• Asthma, occupational
• Chromium, chronic toxic effect
• Contact dermatitis, allergic