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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Description of key information


Ammonium:
In a marine species study with diatoms a 10 day EC50 of 90.4 mg/L was derived with a NOEC (10 -d) of 26.8 mg/L. Although these are based on a 10 day exposure period, the test result was used.
Zinc:
acute toxicity to freshwater algae: lowest IC50 0.136 mg Zn/l (Selenastrum capricornutum; single value) (neutral/high pH)
chronic toxictiy to freshwater algae: lowest NOEC 0.019 mg Zn/l (Pseudokircherniella subcapitata =Selenastrum capricornutum; geomean of 27 data)
chronic toxicity to marine algae: 12 species available which NOECs range between 0.0078 and 0.67 mg/l (dissolved concentrations)
So zinc responsible for aquatic toxicity

Key value for chemical safety assessment

Additional information

Ammonium:

In a static fresh water species study with chorella vulgaris a 5 day EC50 of 1300 mg/L was derived based on exposure to ammonium carboante. Although these are based on a 5 day exposure period, the test result was used.

Zinc:

Acute freshwater toxicity tests of high quality and relevancy performed according to standard protocol. Information is on 1 species which is in both the acute and chronic aquatic database on zinc the most sensitive. The lowest IC50 value is taken as reference value for classification for acute effect at neutral/high pH.

Chronic freshwater toxicity tests of high quality and relevancy according to standard protocol or equivalent. Data on 2 species, one of which the most sensitive of all freshwater organisms, second species is less sensitive.

Chronic seawater tests of high quality and relevancy according to standard protocol or equivalent. Data on 12 species, for which 3 species are in the low part of the species sensitivity distribution. One species of macro-algae is the second most sensitive of all seawater organisms.

So zinc ist responsible for aquatic toxicity