中文摘要：雌激素霉菌毒素如玉米赤霉烯酮（ZEN）存在于地表水中是一个新兴的环境问题。影响其环境归趋的光转化行为尚不明了。本文通过模拟日光照射研究了ZEN在纯水、江河水及河口湾微咸水中的光转化。根据研究结果得出如下结论：由太阳辐射能转化ZEN是自然水体中ZEN降解的重要途径。
外文摘要：The presence of estrogenic mycotoxins, such as zearalenone (ZEN), in surface waters is an emerging environmental issue. Little is known about its phototransformation behavior, which may influence its environmental fate. In this context, the phototransformation of ZEN was investigated in pure water, river water and estuarine water using simulated sunlight irradiation. Kinetic studies revealed that two concomitant processes contribute to the fate of ZEN under solar irradiation: photoisomerization and photodegradation. This phototransformation followed a pseudo-first order kinetics. ZEN degrades quickly in natural waters and slowly in deionized water, with half-lives (t1/2) of 28 ± 4 min (estuarine water), 136 ± 21 min (river water) and 1777 ± 412 min (deionized water). The effects of different water constituents on the phototransformation of ZEN in aqueous solution have been assessed (NaCl, Ca2+, Mg2+, Fe3+, NO3− and oxalate ions, synthetic seawater, Fe(III)-oxalate and Mg(II)-oxalate complexes, humic acids, fulvic acids and XAD-4 fraction). In the presence of synthetic seawater salt (t1/2 = 18 ± 5 min) and Fe(III)-oxalate complexes (t1/2 = 61 ± 9 min), the transformation rate increased considerably in relation to other water constituents tested. The solution pH also had a considerable effect in the kinetics with maximum transformation rates occurring around pH 8.5. These results allow us to conclude that phototransformation by solar radiation can be an important degradation pathway of ZEN in natural waters.
外文关键词：Mycotoxins；Phototransformation；Solar simulated irradiance；Natural waters
作者：Emidio, ES；Calisto, V；de Marchi, MRR；Esteves, VI
作者单位：Sao Paulo State Univ UNESP
期刊名称：CHEMOSPHERE
期刊影响因子：3.698
出版年份：2017
出版刊次：2
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