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The vapour pressure of STPP is negligible, the IUCLID chemical data sheet from the EINECS register indicates a vapour pressure of 0.1 hPa (10Pa). The Henrys law constant is calculated to be 0.03 Pa·m3·mol-1. Atmospheric exposure is not therefore anticipated.

STPP and its soluble complex salts are not expected to adsorb highly onto the solid particles of the aquatic environment, due to their solubility.

In soils, it is expected that STPP will hydrolyse and be bio-assimilated via the same mechanisms in the aquatic environment.

The formation of complex insoluble species is likely to occur in soils. Thus it is expected that STPP may also be transformed in soils to insoluble forms which will remain trapped in soils.

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