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Environmental fate & pathways

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The evaluation of the stability of 44PD (CAS 101 -96 -2) in the environment is based on experimental testing data (hydrolysis) and QSAR estimations. For phototransformation in air, a QSAR for 44PD was done, while for phototransoformation in water, a QSAR estimate based on 77PD ( a structural analog) was used.

The hydrolysis test on 44PD revealed that the substance is hydrolyses with the formation of biodegradable hydrolysis products at pH 4, 7 and 9, with the following half lives:

pH 4: ca. 230hr

pH 7: ca. 5.3 hr

pH 9: ca. 1.5 hr

With regard to phototransformation, for the air compartment, a half-life was estimated for 44PD of 1.095 hr, while in water read across was performed from 77PD QSAR data, yielding half-lives in light and dark of 2 hr and 4 hr, respectively.