钼酸铵分光光度法测定水质中总磷时砷的干扰消除研究  

Study on Cancellation of Arsenic Interference in Determination of Total Phosphorus in Water by Ammonium Molybdate Spectrophotometry

作　　者：龚艳[1] 闻胜[2] 李书谦[1] 胡定金[1] 刘剑彤[3] 敖鸿毅[3] 樊铭勇[1] 

机构地区：[1]湖北省农业科学院农业质量标准与检测技术研究所,湖北武汉430064 [2]湖北省疾病预防控制中心,湖北武汉430079 [3]中国科学院水生生物研究所,湖北武汉430072

出　　处：《分析测试技术与仪器》2011年第1期36-41,共6页Analysis and Testing Technology and Instruments

基　　金：国家重点实验室开放课题资助项目(No.2009FBZ0);973课题项目(2007CB109205;2009CB118705);中科院创新方向项目(KSUXZ-YW-2-808);湖北省农业科技创新中心项目(2010-620-001-03)

摘　　要：采用单一影响因素和正交因素水平研究相结合,试验不同形态砷对钼酸铵分光光度法测磷过程的干扰、干扰的主要因素、硫代硫酸钠最佳加入量及最佳显色时间.结果表明不同形态砷的干扰强度依次是,五价砷[As(V)]大于三价砷[As(Ⅲ)],而三价砷[As(Ⅲ)]又远远大于二甲基砷[DMAA].当As(V)浓度小于2.0 mg/L时,显色时间为测定的主要影响因素;当As(V)的浓度为0.1～5.0 mg/L时,考虑到操作以及实际水样中As(V)的含量等因素,选择硫代硫酸钠0.5 mL(40 mg/mL)为最佳量1,5 min为最佳显色时间。The single affecting factor method is combined with the orthogonal test to study the interference of arsenic speciation and the main interference factor,and to determine the optimal amount of sodium thiosulfate and the best developing time in the ammonium molybdate spectrophotometric detection of total phosphorus in water.Results showed that the interference effects of arsenic species are： arsenate arsenite dimethylarsinic.When the arsenic concentration is lower than 2.0 mg/L,the developing time is the main influence factor.When the arsenic concentration was in the range of 0.1~5.0 mg/L,the optimal amount of sodium thiosulfate（40 mg/mL） was 0.5 mL and the best developing time was 15 min with the consideration of the practical operation and real sample.

关 键 词：钼酸铵分光光度法 水质 总磷测定 砷干扰消除 

分 类 号：O657.32[理学—分析化学]