Agent Name

Sodium dichromate dihydrate

CAS Number

7789-12-0

Formula

Cr2-O7.2Na.2H2-O

Major Category

Metals

Synonyms

Disodium dichromate dihydrate; Chromic acid (H2Cr2O7), disodium salt, dihydrate; Dichromic acid (H2Cr2O7), disodium salt, dihydrate; [ChemIDplus] Disodium oxido-(oxido-dioxo-chromio)oxy-dioxo-chromium hydrate; [ToxPlanet: ECHA - Annex XV Dossier] UN3086

Category

Chromium Compounds, Inorganic

Description

Reddish to bright orange solid; Somewhat deliquescent and soluble in water; [Merck Index] Orange-red odorless crystals; Hygroscopic and soluble in water; [Alfa Aesar MSDS]

Sources/Uses

Used as an oxidizing agent (to make dyes, inks, and other chemicals), bleaching agent (fats, oils, sponges, and resins), tanning agent, and mordant in dyeing; Also used in electric batteries, for refining petroleum, electro-engraving copper, in corrosion inhibitors and corrosion inhibiting paints, metal treatments, hardening gelatin, defoliation of cotton and other plants and shrubs, and as a topical anti-infective; [Merck Index] Used for metal finishing (chrome plating, electroplating, passivating, anodizing, and brightening), to make vitamin K, colored glass, ceramic glazes, essential oils, and perfumes; [ExPub: ECHA - Annex XV Dossier] Found as a contaminant in drinking water from industrial uses including electroplating, leather tanning, and textile manufacturing; [NTP]

Comments

Clear evidence of carcinogenicity in mice and rats; [NTP] An oxidizer that may cause fire on contact with combustible materials; Causes burns; May cause skin and respiratory sensitization; Toxic by ingestion; Highly toxic by inhalation; Harmful by skin absorption; Prolonged or repeated ingestion exposure may cause injury to the lung, liver, digestive system, and blood; Prolonged inhalation exposure may cause serious adverse effects; Suspected carcinogen, mutagen, and reproductive toxicant; [Alfa Aesar MSDS] See "Sodium dichromate." See "Chromium" and the linked diseases.

Exposure Assessment
TLV (ACGIH)

0.05 mg/m3, as Cr

PEL (OSHA)

0.005 mg/m3, as Cr(VI)

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Toxic solid, oxidizing, n.o.s."

Adverse Effects
Nephrotoxin

Yes

Skin Sensitizer

Yes

Asthma

Yes

Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

IARC Carcinogen

Known Carcinogen

NTP Carcinogen

Human Carcinogen

ACGIH Carcinogen

Confirmed Human

Links to Other NLM Databases
Toxicity Information

Search TOXNET

Chemical Information

Search ChemIDplus

Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: