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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The toxicity of Aluminium trilactate to microorganisms was investigated during a ready biodegradation study. The test substance was assumed not to inhibit microbial activity at concentrations up to 100 mg/L. Thus the NOEC in microorganisms is 100 mg/L:

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
100 mg/L

Additional information

The toxicity of Aluminium trilactate (93% a.i.) to microorganisms was investigated during a ready biodegradation study according to EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test; 30 May 2008) and OECD guideline 301 B adopted July 17, 1992 over a period of 28 days and using an inoculum obtained from activated sludge freshly obtained from a predominantly domestic municipal sewage treatment plant. The biodegradation rate was determined by measurement of carbon dioxide evolution.

Inoculum blank, procedural/functional control with the reference substance Sodium acetate and 2 toxicity controls with reference substance and test substance (at 12 mg TOC/L = 35 mg/L test substance and 36 mg TOC/L = 100 mg/L test substance) were performed.

The relative biodegradation was 79% (mean of 2 replicates). Furthermore, biodegradation of at least 60% was reached within a 10-day window. Thus, Aluminium trilactate was readily biodegradable in this modifies Sturm test.

In both toxicity controls more than 25% biodegradation occurred within 14 days (55% at 12 mg TOC/L = 35 mg/L test substance and 54% at 36 mg TOC/L=100 mg/L test substance, based on ThCO2). Therefore, the test substance was assumed not to inhibit microbial activity at both concentrations tested.

Based on the available data, the NOEC for Aluminium trilactate in microorganisms is 100 mg/L.