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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The listed toxicity on fish of different xanthates indicate that potassium ethyl xanthate (CAS# 140-89-6) is much more toxic than sodium ethyl xanthate (CSA# 140-90-9) and toxicity of the latest one is not much higher than sodium isobutyl xanthate.
Results of ecotoxicological testing of Sodium Ethyl Xanthate .
On the basis of the obtained results, the percentage inhibition of the rate of oxygen consumption by the test material was calculated and the EC50 value (the concentration that causes 50% of an effect on test organism within a given exposure period when compared with a control) was determined.
Antimicrobial activity of xanthates is evident from the median inhibitory limit on ammonia oxidation in Nitrosomonas of 12 ppm. Potassium ethyl xanthate is a nitrification inhibitor that has also been observed to inhibit soil denitrification at concentrations around 50 ppm, but only in soils previously amended with mannitol to stimulate denitrifying activity.

Key value for chemical safety assessment

EC50 for microorganisms:
220.4 mg/L

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