微分脉冲阳极溶出伏安法测定水处理剂用铝酸钙中砷

发布时间：2018-02-13 16:37

本文关键词： 微分脉冲阳极溶出伏安法水处理剂用铝酸钙砷　出处：《冶金分析》2017年12期 　论文类型：期刊论文

【摘要】：采用活性面位于侧面的金电极作为工作电极,建立了微分脉冲阳极溶出伏安法测定水处理剂用铝酸钙中砷含量的检测方法。将水处理剂用铝酸钙粉用氯化铝溶液加热回流溶解,经过滤后,对滤液进行稀释,以18%(质量分数)盐酸为支持电解质,对样品稀释液进行微分脉冲扫描阳极溶出伏安法测定。结果表明,砷在金电极上于峰电位为+0.09V左右产生灵敏的溶出峰,该峰峰高与砷的质量浓度在0.5~10μg/L之间呈现良好的线性关系,相关系数为0.997 7,检出限为0.15μg/L。按照实验方法对水处理剂用铝酸钙样品进行测定,并采用电感耦合等离子体质谱法(ICP-MS)做方法对照,同时加入砷标准溶液进行加标回收试验,结果表明,两种方法的测定结果基本一致,且实验方法的加标回收率为90%~102%。对3个水处理剂用铝酸钙样品测定结果的相对标准偏差(RSD,n=6)为2.1%~3.3%。
[Abstract]:A method for the determination of arsenic in calcium aluminate used as water treatment agent by differential pulse anodic stripping voltammetry was established by using the gold electrode on the side of the active surface as the working electrode. The water treatment agent was heated with calcium aluminate powder and dissolved by reflux with aluminum chloride solution. After filtration, the filtrate was diluted and 18% hydrochloric acid was used as the supporting electrolyte. The sample dilution was determined by differential pulse scanning anodic stripping voltammetry. The peak potential of arsenic at the gold electrode is about 0.09V, and the peak height has a good linear relationship with the mass concentration of arsenic in the range of 0.5 ~ 10 渭 g 路L ~ (-1) 路L ~ (-1). The correlation coefficient is 0.997 7, the detection limit is 0.15 渭 g / L. the sample of calcium aluminate used in water treatment agent is determined according to the experimental method, and the ICP-MS method is used as the control method, and the standard solution of arsenic is added to the standard solution to carry out the standard recovery test. The results showed that the results of the two methods were basically the same, and the standard recovery of the two methods was 90 and 102, and the relative standard deviation for the determination of calcium aluminate samples for the three water treatment agents was 2.1% and 3.3% respectively.
【作者单位】：河南省科学院高新技术研究中心;
【基金】：中央高校基本科研业务费专项资金资助
【分类号】：O657.1;TQ085.412

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