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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

NOEC (28 d) ≥ 100 mg/L for activated sludge microorganisms (OECD 301C)

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
100 mg/L

Additional information

Two studies are available investigating the effects of aminoiminomethanesulphinic acid (CAS No. 1758-73-2) to microorganisms.The key study investigated the effects on microorganisms in a biodegradation study according to OECD 301C under GLP conditions (Ministry of Economy, Trade and Industry, Japan, 1991). The study was performed with a mixture of activated sludge from STP with freshwater from rivers and lakes, marine water and marine sediment. No inhibition of biodegradation was observed after 28 d. The test concentration from a biodegradation study which indicated that the test substance is readily biodegradable can be used to derive a NOEC for this endpoint as stated in the ECHA Guidance R.7b (ECHA, 2012). Therefore, the test item concentration of 100 mg/L can be used as NOEC value for the toxicity to activated sludge microorganisms. Thus a NOEC (28 d) of ≥ 100 mg/L resulted.
An additional study confirmed the low toxicity ofaminoiminomethanesulphinic acid to microorganisms (Coenen, 1988). The inhibition of cell multiplication was investigated in a study according to NEN 6509. Twelve concentrations up to 1000 mg/L (nominal) were tested. After incubation of 18 h a toxicity threshold value of 538 mg/L was derived . The toxicity threshold is not an accepted endpoint for the risk assessment but it indicated a low toxicity of the test substance to microorganisms.