雌激素等内分泌干扰物在水体中普遍存在,其在再生水中的存在以及在水体中的迁移转化会产生潜在的健康和生态风险。光降解是水体中雌激素消除的主要途径之一,水体中共存的无机离子及有机质等对雌激素的光解存在不同的影响。对高碑店湖再生水体中雌激素的污染状况进行了调查,结果显示表层水中天然雌激素雌酮(E1)和人工合成雌激素17α-乙炔基雌二醇(EE2)的浓度最高。在模拟太阳光照射条件下对E1在水溶液中的降解规律及影响因素进行了研究,发现在模拟1 SUN的光密度条件下,15 min时E1降解率可达85%(C0=5μg•L-1),而氨氮对E1的光降解存在一定的抑制作用,并且抑制作用随着氨氮的升高而变大。与纯水系统相比,高碑店湖表层水基质中E1的光降解速率较低,说明整体上氨氮、HCO-3、浊度等因素对E1光降解产生的抑制作用占主导。对雌酮及其降解产物进行了红外光谱分析,结果显示1720 cm-1对应的C=O键特征峰在光照时间为0、10和20 min样品中的强度逐渐减弱,而2854 cm-1和2925 cm-1对应的脂肪碳的C-H键特征峰先增强后减弱,可能是因为E1结构中的C-C=O发生了反应生成了C=C-OH,而随着反应的继续,C=C也被进一步氧化,但降解产物的结构需要进一步研究推断。随着E1的光降解,E1水溶液的内分泌干扰活性逐渐下降,氨氮虽然对E1的光降解有一定的抑制作用,但随着降解反应的进行E1水溶液的内分泌干扰活性依然呈下降趋势。%The presence of estrogenic compounds in aquatic environment is ubiquitous and has attracted increasing concern due to their endocrine disruption potential. Photodegradation is one of the main elimination pathways of estrogens in surface water and is influenced differently by different ions and organic matters in the water. In this study, surface water was collected from Gaobeidian Reservoir and analyzed for estrogens and the photodegradation of estrone (E1) in the solution under simulated sunlight irradiation was investigated. The results showed that E1 and 17α-ethynylestradiol (EE2) were the most abundant and that the elimination rate of E1 could be 85% after 15 min of 1SUN irradiance. Ammonium, HCO-3 and turbidity inhibited the photodegradation of E1. Although ammonium ion showed inhibition on the photodegradation of E1, the endocrine disrupting activity of the E1 solution decreased on the presence of ammonium ion. Fourier transformed infrared (FTIR) analysis showed C=O bonds peak de-creased in samples irradiated with longer time, while peak of C-H in aliphatic carbon increased. This is possibly caused by the elimination of C-C=O and formation of C=C-OH during the reaction. Endocrine disrupting activity of the E1 solution decreased along with the photodegradation.
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