Registration Dossier
Registration Dossier
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EC number: 936-276-2 | CAS number: -
Toxicity to other aquatic organisms
Administrative data
Link to relevant study record(s)
Description of key information
According to transformation/dissolution study (OECD guidance 29) conducted for the substance, the most critical constituents leachable to water from this UVCB substance are lead and zinc compounds. However, this endpoint consists read-across data from field studies that is only available for zinc. Results from field studies data was used in the CSA to verify the protectiveness of the HC5 values used in the PNEC derivation and setting of Assessment Factor for zinc.
Additional information
The environmental hazard assessment was conducted based on the most critical constituents of the substance. This substance is an inorganic UVCB substance and can be described as a moist solid powder which is insoluble to water. Therefore, the transformation/dissolution study (OECD guidance 29) was conducted for the substance and the results of this study were used for the chemical safety assessment.
According to the chemical composition analysis, the main phases of the substance are lead sulphate and zinc sulphide. The product consists primarily of sulphur (ca. 35 %), lead (ca. 25 %) and zinc (ca. 17 %) together with minor trace elements such as silver, silicon, aluminium, calcium and iron.
According to T/D study results, the most soluble and critical component of this substance are lead and zinc. However, this endpoint consists read-across data from field studies that is only available for zinc. Results from field studies data was used in the CSA to verify the protectiveness of the HC5 values used in the PNEC derivation and setting of Assessment Factor for zinc. The read-across justification is presented in CSR annex I. The weight of evidence approach was used to make conclusions on the key value for CSA.
Toxicity of zinc and its compounds
Toxicity data for other aquatic organisms in only available for zinc and consists from 6 studies. NOEC results are between 1.45 µg/L (unbound NOEC and therefore not accepted as key value) and 100 µg/L.
The lowest toxicity value: 14 µg/L (14-wk NOEC, Chlorophyta (chlorophyta eveness), no standard guideline)
Conclusions for CSA:
Toxicity data for this endpoint is only available to zinc. The lowest toxicity value for zinc: 14 µg/L (14-wk NOEC, Chlorophyta, no standard guideline)
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