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Toxicity to soil microorganisms

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Key value for chemical safety assessment

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In accordance with REACH Regulation 1907/2006, Annex IX, Column 2, tests for effects on soil micro-organisms do not need to be conducted as direct and indirect exposure of the soil compartment is unlikely. The substance has little potential to adsorb to soil and is not very persistent. According to the available information about production and processing of the substance, and the uses identified, direct releases of the substance to the terrestrial compartment can be excluded.

Furthermore, there is no wide dispersive use as the chemical is only used in industrial processes. From industrial processes, in the unlikely case that tetrahydrophthalic anhydride (THPA) will reach sewage, the anhydride group, which represents the single reactive and toxic functional moiety, rapidly hydrolyses to the respective di-acid. Overall, it is expected that THPA will not be present in sewage sludge and will not therefore be distributed to soil via spreading of sewage onto agricultural land. Direct and indirect exposures of the terrestrial compartment is unlikely.