Zhou Yiqi, Wang Zijian, Xu Yiping, Ma Mei
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Se Pu. 2007 May;25(3):430-4.
Iodate, chlorite and bromate in bottled water are disinfectant by-products (DBPs) from ozonation. The established methods for simultaneous determination of iodate, chlorite and bromate are mostly based on pre- or post-column chemical reaction in which the target compound was converted to another easily detectable species. However, the procedure suffers from several time-consuming reaction steps that involve multiple chemicals, or where the reagents themselves are toxic. In the present study, a rapid, highly sensitive, precise and accurate method was established, and a post-column reaction with sodium nitrite and acid solution of potassium bromide was employed to enhance sensitivity and to reduce interferences. Under optimized conditions, the method limits for iodate, chlorite and bromate were 0.5, 0.4 microg/L and 0.1 microg/L, respectively. Percentage recoveries of iodate, chlorite and bromate varied from 70.8% to 98.0%, 92.4% to 100% and 93.2% to 104.1% respectively with different spiked water samples. The proposed method was demonstrated for detecting the concentrations of iodate, chlorite and bromate in bottled water produced from different water sources. Results showed that severe bromate contamination was present in bottled mineral water purchased from Beijing supermarket, which used spring water or ground water as the sources.
瓶装水中的碘酸盐、亚氯酸盐和溴酸盐是臭氧氧化产生的消毒副产物（DBPs）。已有的同时测定碘酸盐、亚氯酸盐和溴酸盐的方法大多基于柱前或柱后化学反应，即将目标化合物转化为另一种易于检测的物质。然而，该方法存在几个耗时的反应步骤，涉及多种化学物质，或者试剂本身有毒。在本研究中，建立了一种快速、高灵敏度、精确且准确的方法，采用亚硝酸钠和溴化钾酸溶液进行柱后反应以提高灵敏度并减少干扰。在优化条件下，碘酸盐、亚氯酸盐和溴酸盐的方法检出限分别为0.5、0.4μg/L和0.1μg/L。不同加标水样中碘酸盐、亚氯酸盐和溴酸盐的回收率分别在70.8%至98.0%、92.4%至100%和93.2%至104.1%之间。所提出的方法被用于检测不同水源生产的瓶装水中碘酸盐、亚氯酸盐和溴酸盐的浓度。结果表明，从北京超市购买的以泉水或地下水为水源的瓶装矿泉水中存在严重的溴酸盐污染。
