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EC number: 258-054-8 | CAS number: 52628-25-8
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Ammonium:
In a semi-static study with daphnia magna the 21 day NOEC was determined to be 14.6 mg/L.
Zinc:
freshwater:
Data on 13 species available. Species NOECs range between 0.037 and 0.400 mg Zn/l (dissolved concentrations)
Marine:
Data on 26 species available. Species NOECs range between 0.0056 and 0.9 mg Zn/l (dissolved concentrations)
In conclusion zinc is responsible for chronic aquatic invertebrates toxicity
Species NOECs have been put into their respective species sensitivity distributions.
Key value for chemical safety assessment
Additional information
Ammonium:
In a semi-static study with daphnia magna the 21d NOEC is determined to be 14.6 mg/L. However no specific method mentioned, and the water was filtered. The mean analyzed concentrations were within 82 to 92 percent of the corresponding nominal values. The ranges of the temperature, pH and dissolved oxygen measurements for all renewal periods during the study were 19.5 to 20.0 degree C, 8.3 to 8.6 and 8.8 to 9.2 mg/L, respectively. Survival mean total young per daphnid and mean brood size were equally sensitive and differed significantly from the controls at 30.2 mg NH4Cl/mL and higher.Measured concentrations were used to calculate.
Zinc:
Extensive high quality chronic data were available on 13 different freshwater invertebrate species and 26 marine invertebrate species. These data were all screened for relevancy to the environment under study.
The freshwater species are part of several different taxonomic groups: poriferans (4 species), molluscs (2 species), crustaceans (4 species), rotifers (2 species) and insects (1 species). The sensitivity of these species is equally distributed over the species sensitivity distribution.
The marine species are part of several different taxonomic groups: annelids (4 species), cniderians (1 species), crustaceans (6 species), echinoderms (5 species), molluscs (9 species) and nematods (1 species) .The sensitivity of these species is equally distributed over the species sensitivity distribution.
In conclusion zinc is responsible for chronic aquatic invertebrates toxicity
The invertebrate species NOECs are combined with the other freshwater and marine chronic data in the SSD to give the HC5 from which the respective PNECs are derived.
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