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Phototransformation of Selected Pharmaceuticals During UV Treatment of Drinking Water

Phototransformation of Selected Pharmaceuticals During UV Treatment of Drinking Water

Silvio Canonica, Laurence Meunier, Urs von Gunten

Water Res. 2008 Jan;42(1-2):121-8.

PMID: 17709124

Abstract:

The kinetics of Ultraviolet C (UV-C)-induced direct phototransformation of four representative pharmaceuticals, i.e., 17alpha-ethinylestradiol (EE2), diclofenac, sulfamethoxazole, and iopromide, was investigated in dilute solutions of pure water buffered at various pH values using a low-pressure and a medium-pressure mercury arc lamp. Except for iopromide, pH-dependent rate constants were observed, which could be related to acid-base equilibria. Quantum yields for direct phototransformation were found to be largely wavelength-independent, except for EE2. This compound, which also had a rather inefficient direct phototransformation, mainly underwent indirect phototransformation in natural water samples, while the UV-induced depletion of the other pharmaceuticals appeared to be unaffected by the presence of natural water components. At the UV-C (254 nm) drinking-water disinfection fluence (dose) of 400 Jm(-2), the degree of depletion of the select pharmaceuticals at pH=7.0 in pure water was 0.4% for EE2, 27% for diclofenac, 15% for sulfamethoxazole, and 15% for iopromide, indicating that phototransformation should be seriously taken into account when evaluating the possibility of formation of UV transformation products from pharmaceuticals present as micropollutants.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1072679	Sulfamethoxazole Related Compound C		1072-67-9	Price
AP154361510	Iopromide Related Compound A		154361-51-0	Price

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