Université de Poitiers, CNRS - UMR 6008, Laboratoire de Chimie et Microbiologie de l'Eau, ENSIP, Poitiers, France.
Water Res. 2011 May;45(11):3341-50. doi: 10.1016/j.watres.2011.03.047. Epub 2011 Mar 31.
In the present work the degradation of estrone (E1) a natural estrogenic hormone has been studied under simulated solar irradiation. The photodegradation of E1 has been investigated in the absence and in the presence of 7.7-8.9 mg L(-1) of dissolved organic carbon (DOC), under solar light simulation with irradiance approximating that of the sun. DOC extracts from different origins have been used. Half-lives ranging between 3.9 h and 7.9 h were observed. Results indicated that E1 was photodegraded even in the absence of DOC. The presence of DOC was found to enhance the degradation of E1. Experiments performed with the addition of reactive species scavengers (azide ions and 2-propanol) have shown that these two species play a significant role in the photodegradation. Some experiments have been performed with a DOC previously submitted to solar irradiation. Changes in optical and physico-chemical properties of DOC strongly affect its photoinductive properties, and hence its efficiency on E1 degradation. A part of the study consisted in the investigation of photoproducts structures. Five photoproducts were shown by chromatographic analysis: one arising from direct photolysis and the four others from DOC photoinduced degradation.
本工作研究了在模拟太阳光照射下雌酮（E1）一种天然雌激素的降解情况。在不存在和存在 7.7-8.9 mg L(-1)溶解态有机碳（DOC）的情况下，在接近太阳光的模拟光照下，研究了 E1 的光降解情况。使用了来自不同来源的 DOC 提取物。观察到半衰期在 3.9 h 和 7.9 h 之间。结果表明，即使在不存在 DOC 的情况下，E1 也会被光降解。发现存在 DOC 会促进 E1 的降解。通过添加反应性物质清除剂（叠氮化物离子和 2-丙醇）进行的实验表明，这两种物质在光降解中起着重要作用。一些实验是在先前接受过太阳照射的 DOC 上进行的。DOC 的光学和物理化学性质的变化强烈影响其光诱导特性，从而影响其对 E1 降解的效率。研究的一部分包括对光产物结构的调查。通过色谱分析显示了五种光产物：一种来自直接光解，另外四种来自 DOC 光诱导降解。
