ICP-OES法测定杭州市水质中微量硫阴离子含量的实验研究

Experimental Study on the Determination of the Trace Content of Sulfur Anions in the Water Bodies of Hangzhou City by ICP-OES Method

硫酸盐与硫化物,是硫在水中的主要存在形式.国标GB/T 5750-2006《生活饮用水标准检验方法 -无机非金属指标》规定硫酸盐与硫化物是评判水质的重要指标,对其含量有严格的限定。对水质中含硫阴离子检测方法的实验研究有重要的现实意义。选择杭州市水质作为含硫阴离子含量测定实验样本,对水质中硫酸根离子和硫离子进行定量分析。对水样的前处理方法进行了实验探索,找到了利用ICP-OES法（电感耦合等离子体发射光谱法）测定硫酸根离子和硫离子的最佳仪器工作条件.同时进行了与国标测定结果对比的实验.结果表明,在优化的实验条件下,本方法线性相关性好（R〉0.9992）,灵敏度高,检出限在0.05~0.23 mg/L范围内,精密度好（RSD〈2.24%）。对饮用水源及自来水中含硫阴离子的含量进行了加标回收试验,回收率在88.2%~105.7%。

Sulfate and sulfide are the main exist form in the water bodies. In national standard GB / T 5750-2006（ The standard analysis method-nonmetal inorganic anions standard value）,the contents of sulfate and sulfide in water bodies are the important standard value to identify the grade of water quality,in which it has the strict limitation to the content of sulfate and sulfide. Therefore,experimental study on the determination method of content to the sulfur anions in water bodies has an important practical significant. The water sample containing sulfur anions is chosen from the water bodies of Hangzhou city,to make a quantitative analysis to the contents of sulfate and sulfide. The pre-process to the water sample is studied and the optimal working conditions to practice the instrument of ICP-OES（ inductive coupling plasamoptice mission spectroscopy） have been found,which is to detect the contents of sulfate and sulfide in the water samples.Meanwhile,the results contrast tests to detect the content of sulfur anions in the water are done between national standard method and ICP-O ES method. The test results show that,under the optimized conditions,the ICE-OCP method has a good linear correlation（ R 0. 9992）,high sensitivity and a good precision（ RSD 2. 24%）. The detecting limitation is in the range of 0. 05 ~ 0. 23 mg / L. The recovery experiments to detect the contents of sulfur anions in drinking water and tap water have been done. The yields of recovery are 88. 2% ~ 105. 7%.