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EC number: 232-140-5
CAS number: 7789-00-6
The results of the studies evaluated in the EU RAR are summarised below:
Endpoint:growth (g)biomass (b)
8 d NOEC (g)
Staves and Knaus (1985)
7 d NOEC (g)
Sloof and Canton (1983)
calculated as LOEC/2 from paper, effect of 14%; (b) - biomass; (g) ¿
sodium chromate tested; all others used potassium dichromate. All
concentrations as Cr.
study rated as IIIb
From two studies with four species, the 7 to 8 day NOEC values (growth)
to aquatic plants range from 0.1 to 0.5 mg/L, based on tests with
potassium dichromate and sodium chromate.
Where comparison is possible, the toxicity of sodium chromate or sodium
dichromate, when expressed on a total chromium basis, does not appear to
be significantly different from that of potassium dichromate. This is as
would be expected if the equilibria between the chromate and dichromate
anions are established in the test medium. Little information is
available for ammonium dichromate and chromic acid, but it would be
expected that their toxicity would be similar to that of the other
chromates/dichromates, when expressed on a total chromium concentration
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