环境样品中亚砷酸盐、砷酸盐、甲基胂酸和二甲基胂酸的测定  

Determination of Arsenite,Arsenate,Monomethylarsonic Acid and Dimethylarsinic Acid in Environmental Samples

作　　者：庞叔薇[1] 李淑芹[2] 

机构地区：[1]中国科学院生态研究中心,北京100083 [2]哈尔滨工业大学应用化学系

出　　处：《分析化学》1990年第2期146-149,共4页Chinese Journal of Analytical Chemistry

摘　　要：本文叙述了分光光度法测定环境样品中亚砷酸盐。砷酸盐、甲基胂酸和二甲基胂酸的方法。这些砷的形态通过KBH_4还原为相应的砷化氢,砷化氢和甲基胂化氢与二乙基二硫代氨基甲酸银(AgDDC)形成两种不同颜色的络合物。借分光光度法测定吸光度,建立并解联立方程式,可测得各种形态砷的含量。对于环境样品中这四种形态砷的定量检出限为1.0μg As,回收率达90～100％。A spectrophotometric method is described for the determination of arsenite, arsenate, monomethylarsonic and dimethylarsinic acid in environmental sample. The four species of arsenic are separated out of a two-step reduction to their corresponding arsines after being reducted by potassium borohydride. The arsine and methylarsines form two different color complexes with silver diethyldithiocarbamate. By simultaneous spectrophotomet-is equations, the amount of each arsine is determined. The quantitative limit is 1.0μg/g of elemental As for all four arsenic species. The recovery of 90～100% of all four arsenic species from environmental sample is reported.

关 键 词：砷 环境分析 分光光度法 环境样品 

分 类 号：X132[环境科学与工程—环境科学]