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EC number: 232-140-5
CAS number: 7789-00-6
The results of the algal toxicity studies evaluated in the EU RAR are
Endpoint:growth (g)biomass (b)
Algae - freshwater
10 d NOEC (g)c
Cairns Jr. et al. (1978)
72 h IC50 (g)
Jouany et al. (1982)
96 h NOEC (b)
Meisch and Schmitt-Beckmann (1979)
Chlorella sp (wild)
18 d NOEC (g)c
Microcystis aeruginosa (bluegreen)
96 h NOEC (g)
Sloof and Canton (1983)
96 h NOEC
72 h EC50 (g)
Kuhn and Pattard (1990)
72 h EC10 (g)
72 h EC50 (b)
72 h EC10 (b)
72 h IC10 (g)
96 h EC50 (b)
Greene et al. (1988)
Christensen et al. (1983) Christensen and Nyholm (1984)
Algae- brackish water
calculated as LOEC/2 from paper, effect of 14%; (b) - biomass; (g) ¿
sodium chromate tested; all others used potassium dichromate. All
concentrations as Cr.
duration of test too long for inclusion in PNEC derivation.
study rated as IIIb
From the EU RAR, most of the algal toxicity data have been generated
with potassium dichromate. 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
The available EC50 values for algae range from 0.13 to 4.6 mg/l Cr; NOEC
values are in the range 0.01 to 0.64 mg/l Cr. With marine algae,
salinity and sulphate ion concentration have been shown to be important
factors in determining the toxicity of chromium (VI). The toxicity of
chromium (VI) is generally highest at low salinities (<2¿) and low
sulphate ion concentrations (Riedel, 1984 and 1985; Frey et al., 1983).
At higher salinities, marine alga appears to be of similar or slightly
lower sensitivity as freshwater algae.
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