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EC number: 213-180-2
CAS number: 928-70-1
The hazard assessment of this substance in the water compartment was
based on the lowest short-term toxicity test results of three taxonomic
groups (algae, crustaceans and fish) and the use of assessment factors.
As there were neither short-term nor long-term aquatic toxicity test
results available for marine organisms, the PNEC for marine water was
also derived based on the aquatic fresh water toxicity. The lowest
short-term aquatic toxicity of the substance was determined to daphnids (Daphnia
magna) with EC50 (48h) value of 3.67 mg/L (inhibition of
mobility). Hazard assessment to sewage treatment microbes was not
conducted, as there are no emissions to the STP.
The following data was used in classification and labelling of potassium
48-h EC50 (immobilisation) D.magna, 3.67 mg/l (OECD 202, GLP)
72-h EC50 (growth rate) Desmodesmus subspicatus, 10.51 mg/l (OECD
96-h LC50 (mortality) Danio rerio, 10 mg/l (OECD 203, GLP),
read-across data from potassium isobutyl xanthate
Conclusion: no acute toxicity as the lowest toxicity value is > 1 mg/l.
72 -h NOEC (growth rate) Desmodesmus subspicatus,1 mg/l (OECD
28-d NOEC (reproduction) Oncorhynchus mykiss, 0.79 mg/l (non
guideline study (Klimisch score 3); read-across from potassium amyl
Laboratory studies on biodegradation water screening (read-across data),
no studies on the target substance:
98 % of the analogue substance was degraded in 12 days. 75 % of the
substance was degraded in 5 days (modified Zahn-Wellens test (OECD 302
B). Read-across data from potassium isobutyl xanthate (PIBX). Results
indicate that the test substance is inherently biodegradable.
Bioaccumulation and/or persistence:
No potential for bioaccumulation as log Kow -0.76 (estimate with
EPISUITE; US EPA 2013)
Conclusion: Aquatic chronic toxicity as the reliable short-term toxicity
value (D.magna) is between 1 -10 mg/l and the substance is not
considered readily biodegradable.
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