水质铅自动在线监测仪测定水样中铅的含量  

Determination of lead in water sample by automatic on-line analysis monitor

作　　者：洪陵成[1] 朱金伟 张红艳 刘超 马小茹[1] 

机构地区：[1]河海大学,南京210000 [2]江苏德林环保技术有限公司,南京211103

出　　处：《分析仪器》2013年第5期42-49,共8页Analytical Instrumentation

基　　金：江苏省环保科研课题项目(No.201121)

摘　　要：首先，构建了基于聚苯乙烯-双硫腙纳米纤维的铅离子富集前处理装置，可以有效地降低铅的检出限并提高检测灵敏度和选择性。其次，研发了水质铅自动在线分析监测仪，以预镀汞膜的玻碳电极为工作电极，采用阳极溶出伏安法，对实验参数进行了优化，例如预镀汞膜的条件、缓冲液的种类和浓度、铅富集时间和电压等。在最优化条件下，铅的溶出峰面积与其浓度在0～2000μg／L范围内呈现良好的线性关系，其回归方程为y1=-0．07843＋0．00269x（相关系数为0．998，浓度范围为5～2000μg／L），y2=-0．0035＋0．00178x（相关系数为0.998，浓度范围为5～100μg／L），检出限为0．38μg／L。在此基础上，采用标准加入法对水样中铅的含量进行了测定，并与原子吸收法的测定结果进行了比较。结果显示，该水质铅自动在线监测仪具有快速、准确、简便、灵敏等优点。First, the pre-treatment device based ment was constructed, which could reduce detection on polystyrene-dithizone nanofibers for lead enrich- limit and improve sensitivity and selectivity effective- ly. Next, with glassy carbon electrode pre-coated by mercury film as working electrode, an automatic on- line analysis monitor of lead was developed by anodic stripping voltammetry, and various experimental conditions were investigated, i. e. , the condition of pre-coated mercury film, the kind and concentration of buffer solutions, the enrichment time and voltage of lead etc. Under the optimized conditions, the stripping peak area of lead showed a good linearity of wide range between 0-2000μg/L. The linear regression equa- tion was y1-=-0. 07843＋0. 00269x（R=0. 998,with the wide range between 5-2000 μg/L）,y2=-0. 0035＋0.00178x（R=0.998,with the wide range between 5-100 μg/L）,LOD （limit of detection） = 0.38 μg/L （at a signal-to-noise ratio of 3）. Then, the water samples were determined by standard addition method. Comparing with atomic absorption spectrometry method, this automatic on-line analysis monitor of lead was advantageous of fast, accurate, simple, sensitive and cheap etc.

关 键 词：纳米材料 前处理 预镀汞膜 阳极溶出伏安法 铅 水质监测 

分 类 号：X832[环境科学与工程—环境工程]