电感耦合等离子体发射光谱法测定西藏日多温泉地热水中11种主次量元素

西藏地热水的矿化度普遍较高,矿物质种类丰富,本文建立了采用电感耦合等离子体发射光谱(ICP-OES)同时测定西藏日多温泉地热水中11种主次量元素(钾钠钙镁硅硼锂锶砷铁和硫酸根)的分析方法。使用双向观测模式可确保不同浓度元素的同时检出,且地热水采用1%硝酸介质保存,在5周时间内11种元素含量的测定值基本稳定。方法检出限为0.0006~0.0162 mg/L,加标回收率为95.5%~105.8%,精密度(RSD,n=10)均小于6%,实际水样的测试结果与传统方法基本吻合。本方法为西藏温泉的水文地球化学研究提供了大量可靠的数据。

Determination of 11 Major and Minor Elements in Geothermal Water of the Riduo Hotsprings from Tibet by Inductively Coupled Plasma-Optical Emission Spectrometry

Geothermal water in Tibet has a high degree of mineralization with abundant mineral substances. Simultaneous determination of potassium, sodium, calcium, magnesium, silicon, boron, lithium, strontium, arsenic, iron and sulfate radical in geothermal water of Riduo Hotspring by Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) was developed in this study. Analytical conditions were optimized by application of two-way observation mode to ensure simultaneous determination of the multi-elements in geothermal water. In addition, geothermal water was preserved in 1% nitric acid and the results of 11 elements after five weeks are stable. This method has a detection limit of 0.0006-0.0162 mg/L, recoveries of 95.5%-105.8% by standard addition, and relative standard deviation (RSD, n=10) of less than 6%. The analytical results were in good agreement with those obtained by traditional methods. This method provides a number of reliable data for hydrogeochemical research on geothermal water in Tibet.