Sodium dichromate anhydrous

EGP 431.53

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  • Anhydrous sodium dichromate has the empirical formula Cr2Na2O7 and a molecular weight of 261.96.
  • The dihydrate forms reddish to bright orange elongated prismatic crystals with a density of 2.348 at 25°C.
  • The anhydrous salt melts at 356.7°C and begins to decompose at about 400°C.
  • It is very soluble in water.
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Use

Sodium dichromate is used as a defoliant of cotton and other plants and as a wood preservative.

61.2.1.2 Toxicity to Laboratory Animals

Basic Findings

The lethal intravenous dosages of sodium dichromate for several species are in the range 37–417 mg/kg. The toxicity of the potassium salt is of the same order of magnitude and its lethal oral dosage for the dog is 2829 mg/kg (Spector, 1955). Although one report (Schroeder, 1973) indicated that prolonged administration of 5 ppm hexavalent chromium in drinking water produced a slight decrease in growth, other studies indicate that concentrations up to 10,000 ppm may be given without ill effect (Gross and Heller, 1946; MacKenzie et al., 1958).

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