Determination of Sodium, Magnesium, Calcium, Lithium and Strontium in Natural Mineral Drinking Water by Microwave Plasma Torch Spectrometer with Nebulization Sample Introduction System
1. East China Institute of Technology/Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, China 2. College of Chemistry, Jilin University, Changchun 130021, China
摘要： 采用微波等离子体炬(MPT)作为激发光源，通过气动雾化系统进样，循环水冷凝-浓硫酸吸水装置作为去溶系统，以Ar为等离子体工作气体，建立了氩微波等离子体炬全谱仪检测矿泉水中Na, Mg, Ca, Li和Sr等五种元素的方法。详细探究了微波功率源功率、工作气流量及载气流量等实验参数对待测元素发射信号的影响，并且对这些参数进行了优化。在优化的实验条件下，对11种瓶装饮用矿泉水进行了检测，方法对Na, Mg, Ca, Li和Sr的检出限分别为4.4，21，56，11和84 μg·mL-1，相对标准偏差范围为1.30%～5.45%(n=6)，加标回收率在84.6%～98.5% 之间。实验结果表明，此装置简单便捷、分析成本低;此方法分析速度快、精确度与准确度高、能够同时测定多种元素，适用于矿泉水中元素检测，为打击非法商家提供了手段，同时也为人们的饮用水质量提供了安全保障，有望用于食品安全、药品安全、临床诊断及更多领域的分析检测。
关键词：微波等离子体炬全谱仪;气动雾化进样;矿泉水
Abstract：The microwave plasma torch (MPT) was used as the emission light source. Aqueous samples were introduced with a nebulizer and a desolvation system. A method for the determination of Na, Mg, Ca, Li and Sr in natural mineral drinking water by argon microwave plasma torch spectrometer (ArMPT spectrometer) was established. The effects of microwave power, flow rate of carrier gas and support gas were investigated in detail and these parameters were optimized. Under the optimized condition, the experiments for the determination of Na, Mg, Ca, Li and Sr in 11 kinds of bottled mineral drinking water were carried out by ArMPT spectrometer. The limit-of-detection (LOD) of Na, Mg, Ca, Li and Sr was found to be 4.4, 21, 56, 11 and 84 μg·mL-1, respectively. Relative standard deviation (n=6) was in the range of 1.30%～5.45% and standard addition recoveries were in the range of 84.6 %～98.5 %. MPT spectrometer was simpler, more convenient and of lower cost as compared to ICP unit. MPT spectrometer demonstrated its rapid analysis speed, accuracy, sensitivity and simultaneous multi-element analysis ability during the analysis process. The results showed that MPT spectrometer was suitable for metal elements detection for natural mineral drinking water. This approach provides not only one way for resisting the illegal dealings, but also a security for the quality of drinking water. Moreover, the usability of MPT spectrometer in the field of food security; drug safety; clinical diagnostic is promised.
Key words：Microwave plasma torch spectrometer;Nebulization sample introduction system;Mineral drinking water
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