Registration Dossier
Registration Dossier
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EC number: 203-103-0 | CAS number: 103-34-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 35 mg/L
Additional information
The toxicity of Sulfatan R (DTDM) to Selenastrum capricornutum was assessed during a study performed in accordance with Standard Methods for Examination of Water and Wastewater, and Methods of Acute Toxicity Test with Fish, Macroinvertebrates and Amphibians. The toxicity of DTDM appeared to increase throughout the 96h of exposure. Based on decrease of in vivo chlorophylla, the estimated 24h-EC50 was > 100 ppm while the calculated 96h-EC50 was 29 ppm (10-93 ppm). The calculated 96h-EC50 based on decrease of cell numbers, was 29 ppm (10 -84 ppm). There was little effect of the test material on the alga after 24 hours of exposure. After 48 hours of exposure decrease of in vivo chlorophyll a was observed in cultures exposed to 10 and 100 ppm. Decrease of cell numbers after 96 hours was from 23% in culture exposed to 18 ppm to 98% in those exposed to 100 ppm. Cell numbers in cultures exposed to 10 ppm were enhanced 3%. The 72h-EC50 of DTDM was estimated at 35 mg/l.
Actually, water quality parameters of temperature and pH were measured throughout the test and were within acceptable limits. No analytical monitoring of the tested substance was performed during the test and no sufficient details are given in order to challenge the validity of the results. For these reasons the results are considered as acceptable with restrictions.
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