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EC number: 215-607-8
CAS number: 1333-82-0
Potassium dichromate is recommended as a reference substance in the
acute toxicity to Daphnia test (Method C.2; EEC, 1992). A ring test
involving 129 EC50 determinations from 46 laboratories determined the
mean 24h-EC50 value as 1.5 mg K2Cr2O7/l (EEC, 1992). This is equivalent
to an EC50 of 0.53 mg Cr/l, expressed on a concentration of chromium
basis. The toxicity of chromium (VI) to invertebrates in short-term
tests appears to depend on water properties such as hardness, pH and
temperature. Persoone et al. (1989) noted decreasing EC50 values for
Daphnia magna with decreasing hardness and with increasing temperature.
Although the conditions included some which were outside those
recommended, checks were carried out to make sure that they did not
cause mortality or stress in the controls.
For some invertebrates, toxicity data is available for more than one of
the chromium (VI) compounds included in this assessment. The limited
available information indicates that, when expressed on a total chromium
concentration, there are no significant differences between the toxicity
of sodium chromate, sodium dichromate and potassium dichromate (allowing
for differences in water properties). 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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