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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

Key Study: Oldersama et al (2003): 72 h ErC50 = 37 mg/L  and 72 h ErC10 = 5.7 mg/L (Scenedesmus subspicatus)

Key value for chemical safety assessment

EC50 for freshwater algae:
37 mg/L
EC10 or NOEC for freshwater algae:
5.7 mg/L

Additional information

Oldersama et al (2003) was chosen as the key study on the basis that it was a well reported method study performed in line with standardised OECD and EU guidelines and conducted to GLP standard. In addition, the purity of the test substance was 99.66%. The 72 hour ErC50 for this study was determined to be 37 mg/L, 72 hour ErC10 = 5.7 mg/L.

The Ward et al (1996) study was another reliable guideline study, and gave a 96 h ErC50 of > 9.8 mg/L. The test material contained at least 99% pure Dimethyltin dichloride. Oldersama et al (2003) was chosen over this study on the basis that it gave a definitive ErC50 value as opposed to a limit value, and was also carried out for the typical 72 h for this endpoint, as opposed to 96 h in the Ward et al (1996) study.