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Environmental fate & pathways

Phototransformation in water

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Direct photolysis rate constants and half lives for near surface clear natural water during spring, summer, fall, and winter at latitude 50° N were estimated based on the laboratory data. Chlorhexidine digluconate was used as test substance, however photolysis was studied for the CHD-base. The estimated half-lifes were between 8.6 d in summer and 69.1 d in winter. A reaction rate for natural water bodies was not determined. Under natural conditions photolysis occurs exclusively near the water surface. In deeper water layers photolysis is inhibited by dullness and light disperion. Therefore, the determined reaction rates cannot be adopted for environmental half-lifes. 

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