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EC number: 232-140-5
CAS number: 7789-00-6
The results of the chronic aquatic invertebrate toxicity studies
evaluated in the DAR are summarised below.
7-day NOEC (survival)
7-day NOEC (reprod)
De Graeve et al. (1992)
21-day NOEC (mortality)
21-day NOEC (reprod)
21-day NOEC (survival)
21-day NOEC (growth)
21-ay NOEC (yield)
14-day NOEC (reprod)
Kuhn et al. (1989)
Sloof and Canton (1983)
Van Leeuwen et al. (1987)
Elnabarawy et al. (1986)
11-day NOEC (reprod)
25-day NOEC (survival)
25-day NOEC (development)
40-day NOEC (reprod)
40-day NOEC (mortality)
7-day NOEC (hatchability)
are from tests with potassium dichromate except for a - sodium
dichromate. All concentrations as Cr.
De Graeve et al., (1992): this paper reported the results of a ring
test, in which 18 determinations of the NOEC values were made.
values in the table here are the geometric mean of the NOEC values
reported for each endpoint.
From a review of the long-term effects of potassium and sodium
dichromate on aquatic invertebrates, a range of results is presented
based on several endpoints and durations of exposure. As well as
effects on survival and reproduction of invertebrates, sublethal effects
of exposure to chromium (VI) have been reported. Adult grass shrimp, Palaemonetes
pugio, were exposed to levels of chromium (VI) (as sodium chromate)
ranging from 0.5 to 4.0 mg/l over 28 days. Approximately 41% of
surviving shrimp possessed cuticular lesions, usually associated with articulations
of the appendages and abdomen, after exposure to 0.5 mg/l. Increasing
concentrations lead to a proportionate increase in the loss of limbs
such that nearly 50% of limbs were lost at the highest exposure
concentration. It was proposed that the organisms experienced chromium-induced
exoskeletal deficiencies resulting in a viaduct for pathogenic organisms
and direct chromium influx that perpetuated lesion development (Doughtie
et al., 1983).
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