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Ecotoxicological information

Endpoint summary

Administrative data

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No relevant information is available on the toxicity of mercaptoacetic acid to soil organisms. Therefore, we applied the EPM strategy to soil risk assessment, following the rules set out in the integrated testing strategy (ITS) detailed in section R.7.11.6., Chapter R.7c of the ECHA Guidance on information requirements and chemical safety assessment (version 3.0, June 2017). No relevant terrestrial toxicity datum is available for derivation of a PNECsoil. Therefore, a “soil hazard category” was assigned to mercaptoacetic acid. Mercaptoacetic acid is not very toxic to aquatic organisms and is readily biodegradable. In addition, both partition and adsorption coefficients (both inferior to 3) allows considering mercaptoacetic acid as not very adsorptive. Mercaptoacetic acid falls therefore within the scheme of “Hazard category 1”, which states that only the EPM method is required for the screening assessment. When PEC/PNECscreen is inferior to 1, then “no toxicity testing for soil organisms need to be done”, as stated in the R.7c Guidance. The new RCR derived from the new freshwater PNEC with the EPM method is inferior to 1 for the terrestrial compartment. This information is presented in the updated CSA. Therefore, following the rules set out in section R.7.11.6., Chapter R.7c of the ECHA Guidance on information requirements and chemical safety assessment (version 3.0, June 2017), and in accordance with the REACh regulation EC 1907/2006 annexes IX and X, section 9.4, column 2, no testing on terrestrial organism is needed.

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