含17β-雌二醇饮用水氯化消毒前后水质生物毒性的变化

发布时间：2018-01-13 16:36

本文关键词：含17β-雌二醇饮用水氯化消毒前后水质生物毒性的变化　出处：《环境工程学报》2017年11期 　论文类型：期刊论文

【摘要】：选择饮用水中经常暴露的17β-雌二醇(E2)为研究对象,考察了含有E2饮用水在氯化消毒前后的水质生物毒性变化规律。小球藻急性毒性实验结果表明,不同浓度E2(0、2、4、8、16 mg·L~(-1))单独暴露条件下,其对小球藻的生长抑制率呈现出较为明显的剂量-效应关系,即随着E2暴露浓度的升高,对小球藻的生长抑制率有所增加;在较高氯投量下(E2与氯摩尔浓度比值为1∶2和1∶5),氯化消毒后水样对小球藻的生长抑制率均高于氯化消毒前,而在低氯投量下(E2与氯摩尔浓度比值为4∶1和1∶1),水样对小球藻的生长抑制率均低于氯化消毒前,表明低氯投量可降低E2产生的水质急性毒性风险。小球藻酶活性实验结果表明,无论是SOD活力、CAT活力,还是MDA含量,并没有出现因受E2暴露和氯氧化胁迫而产生显著上升的趋势,表明E2单独暴露或E2经氯化消毒后并不会对小球藻的酶活性产生显著影响。
[Abstract]:Selection of drinking water are often exposed to 17 beta estradiol (E2) as the research object, investigated the drinking water containing E2 in Biological Toxicity Variation before and after chlorination. Chlorella acute toxicity experiment results show that different concentrations of E2 (0,2,4,8,16 mg L~ (-1)) exposure conditions on the growth of Chlorella the inhibition rate showed obvious dose effect relationship, with the increase in the concentration of E2 exposure, chlorella growth inhibition rate increased; at higher chlorine dosage (concentration ratio of E2 and chloride molar was 1: 2 and 1: 5), inhibition on the growth of Chlorella water after chlorination rate was higher than that of the chlorination before and in low chlorine dosage (concentration ratio of E2 and chloride molar was 4: 1 and 1: 1), water samples on chlorella growth inhibition rate was lower than that before disinfection, low chlorine dosage can reduce the acute toxicity of water quality risk E2. The enzyme activity of Chlorella The results of sexual experiments showed that SOD activity, CAT activity or MDA content did not appear to be significantly increased due to E2 exposure and chlorination stress, indicating that E2 exposure alone or E2 after chlorination did not significantly affect the enzyme activity of Chlorella.

【作者单位】：北京林业大学环境科学与工程学院北京市水体污染源控制技术重点实验室;
【基金】：国家自然科学基金面上项目资助(51178046)
【分类号】：R123
【正文快照】： 环境激素是一类外源性化合物,能够干扰生物机体内源激素产生,改变内分泌功能,继而在生物或其后代中引起不良的健康影响[1]。17β-雌二醇(E2)是一种分布广泛的天然环境雌激素,E2分子C-17位置β方向上有一个羟基(—OH),分子结构中含有一个类固醇环,水溶性较差,易溶于乙醇、丙酮

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