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- W4247132006 abstract "Stilbene-type fluorescent whitening agents (FWAs), such as the distyryl biphenyl (DSBP) and the diaminostilbene types (DAS 1 and DAS 2), are commonly used in detergents and papers. They are not readily biodegradable, but due to their ability to absorb part of the terrestial sunlight, they can be photochemically degraded in natural surface waters. Following a fast preceding photoisomerization, the three compounds are degraded by direct photochemical processes yielding mainly aldehydes and alcohols. Their degradation quantum yields are similar, about 10-4. Nevertheless, in samples of a eutrophic Swiss lake water, DSBP is photochemically degraded three times faster (t1/2 = 87 min) in summer noon terrestrial sunlight at 25 °C than DAS 1 and DAS 2 (t1/2 = 278 and 313 min) because of a higher rate of sunlight absorption by the DSBP isomer mixture. All FWAs are degraded faster if the oxygen concentration is increased. Dissolved natural organic material partly inhibits the degradation of DSBP in the reaction with molecular oxygen. The behavior of these compounds illustrates the influence of a preceding isomer equilibrium on degradation rate coefficients." @default.
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- W4247132006 date "1996-06-01" @default.
- W4247132006 modified "2023-10-09" @default.
- W4247132006 title "Degradation of Fluorescent Whitening Agents in Sunlit Natural Waters" @default.
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- W4247132006 doi "https://doi.org/10.1021/es950711a" @default.
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