武汉市饮用水中阿特拉津及降解产物浓度特征

The Concentration Characteristics of Atrazine and Degradation Products in Drinking Water in Wuhan

为了解武汉市政水厂水源水和出厂水中阿特拉津及降解产物的浓度水平和去除率,该文采用超高效液相色谱-串联质谱法,对10家市政水厂在丰水期和枯水期采集的水源水和出厂水中的阿特拉津及降解产物进行检测,检测物质分别为阿特拉津(ATZ)、异丙基阿特拉津(DIA)、二丁基阿特拉津(DEA)、二氨基氯代阿特拉津(DACT)和羟基阿特拉津(OH-ATZ)。研究结果显示,水源水中ATZ的浓度中位数是37.2 ng/L,降解产物浓度依次为DEA(5.88 ng/L)、OH-ATZ(5.07 ng/L)、DIA(3.12 ng/L)和DACT(1.26 ng/L),阿特拉津及降解产物在汉江水中的含量是长江水的3~5倍。水源水和出厂水中DIA和DEA在丰水期7月浓度较高,而DACT在枯水期5月浓度较高。经过常规水处理工艺流程后,ATZ几乎未被去除,DIA和DACT出现去除率负增长,建议在常规水处理工艺中增加颗粒活性炭和臭氧等工艺,以降低饮用水中阿特拉津及降解产物的浓度。

The aim of the study was to characterize the occurrence of atrazine and degradation products in source water and treated water of municipal water supply in Wuhan,central China and assess the removal efficiency of them by conventional water treatment processes.The source water and treated water during rainy season and dry season in ten water treatment plants were collected for determination of atrazine and the degradation products,including atrazine(ATZ),deethylatrazine(DEA),deisopropylatrazine(DIA),diaminochlorotriazine(DACT),and hydroxyatrazine(OH-ATZ).The results showed that the median concentration of ATZ in source water was 37.2 ng/L,and the degradation product was DEA(5.88 ng/L),OH-ATZ(5.07 ng/L),DIA(3.12 ng/L),and DACT(1.26 ng/L).The concentration of ATZ in the Han River was 3~5 times that of the Yangtze River.The concentration of DEA and DIA were higher during rainy season in July,but the DACT was higher during dry season in May.After conventional water treatment process,ATZ was almost unremoved,and the removal rate of DIA and DACT showed negative growth.In order to remove atrazine and degradation products efficiently,additional water treatment such as granular activated carbon and ozonation may be required.