Registration Dossier
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EC number: 942-732-1 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72 hour EC50 (growth rate) Ethanolamine Salt of Aryl Sulphonoamido Carboxylic Acid (30%) was 19.2 mg/L. There was clear evidence of a dose response in this study. The tested solution contains30% of the registered substance. Assuming a linear dose-response relationship, 30% of 19.2 mg/L = 5.76 mg/L. Therefore the EC50 for the registered substance is proposed to be 5.76 mg/L. The substance is not considered to be toxic to aquatic algae. The EC50 of monoethanolamine that makes 50% of the registered substance is 393.42 showing that the substance pose no acute toxicity hazard to Algae.
Key value for chemical safety assessment
- EC50 for marine water algae:
- 5.76 mg/L
- EC10 or NOEC for marine water algae:
- 0.96 mg/L
Additional information
The toxicity of the test material (a 30% solution containing the registered substance) to aquatic algae was determined in accordance with the EN ISO Guideline for Testing of Chemicals 10253:1998. The study was conducted using the marine algaeSkeletonema costatum. Algae was exposed to the test material over a range of 1, 3.2, 10, 32 and 100 mg/L in seawater. The exposed algae was monitored over a period of 72 hours to determine the concentration of test material which inhibited algal growth rate by 50% i.e. the EC50. The 72 hour EC50 (growth rate) of the test material was 19.23 mg/L. The solution contains 30% of the registered substance. Assuming a linear dose-response relationship, 30% of 19.23 mg/L = 5.76mg/L. Therefore the EC50 for the registered substance is proposed to be 5.76 mg/l. The registered substance is not considered to be toxic to aquatic algae. An equivalent study on monoethanolamine showed and EC50 of 393.42. Monoethanolamine constitute 50% of the registered reaction mass; therefore consideration of its toxicity is justified. However, the EC50 showed that Monoethanolamine is not considered toxic to aquatic algae and is also less toxic than Ethanolamine Salt of Aryl Sulphonoamido Carboxylic Acid.
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