电感耦合等离子质谱同时测定地下水中的溴及碘

Simultaneous determination of bromine and iodine in underground water by inductively coupling plasma-mass spectrometry

现有的国家标准及行业标准方法测定水中溴及碘均较繁琐、效率低,且结果是某一形态溴或碘含量,不同方法得到的结果存在差异,建立一个简单快速测定地下水中溴量及碘量的方法非常重要。在优化仪器参数下,建立了电感耦合等离子体质谱同时测定地下水样品中溴含量及碘含量的方法,研究了测定中钾对溴的干扰因素,并对比讨论了不同实验条件下的结果,以及pH对样品测定的影响。最终确定水介质的Re元素作内标,定量限均为1.01μg/L,精度为2.80%,用国家标准物质验证了该方法的准确度,测定实际地下水样品加标回收率均为85%~110%,可用于无有机污染的地下水等环境水质检测。

The existing national and industrial standard methods for determining bromine and iodine in water are compli-cated,and the analytical results are the content of a certain form of bromine or iodine,which is inefficient and leads varia-tion between methods.It is important to estimate a convenient determination method for the determination of bromine and iodine in groundwater.In this study,a method for the simultaneously determination of bromine content and iodine in groundwater samples using inductively coupling plasma mass spectrometry was developed with optimized instrument param-eters.The results of different experimental conditions were compared and discussed,and the interference of potassium with bromine in the determination and the effect of sample pH on the determination were studied.Finally,the element rhenium(Re)in the water medium was chosen as the internal standard,and the limits of quantitation of bromine and iodine were both 1.01μg/L with an accuracy of 2.80%,and the accuracy of the method was verified with national standards.The ac-tual measurement of several groundwater samples by this method showed that the standard recovery rates were 85%~110%,indicating that this method can be used for detecting quality of environmental water such as groundwater without or-ganic pollution.