Sodium dichromate dihydrate

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; [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

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; [Alfa Aesar MSDS] See "Sodium dichromate." See "Chromium" and linked occupational diseases.

Biomedical References

Yes

0.0001 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

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

Yes

Yes

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

Processes

Industrial Processes with risk of exposure:

• Battery Manufacturing
• Electroplating
• Glass Manufacturing
• Leather Tanning and Processing
• Painting (Pigments, Binders, and Biocides)
• Petroleum Production and Refining
• Textiles (Printing, Dyeing, or Finishing)