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Toxicity to soil microorganisms

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Effects on soil microorganisms are not anticipated. In aquatic toxicity testing, activated sludge (sewage treatment plant micro-organisms) do not appear to be affected by siloxanes. However, some further testing with soil-specific species (subject to demonstration of adequate stability in the test system) is considered to be useful as further validation. Should no toxicity be observed with D5 (CAS 541-02-6) and L3 (CAS 107-51-7), no microbial assay with D6 will be proposed. The approach will be reconsidered once the relevant stability and toxicity studies are complete.