阳极溶出伏安法测定海水中的砷  

DETERMINATION OF ARSENIC IN SEA WATER BY ANODIC STRIPPING VOLTAMMETRY

作　　者：黄薇文[1] 赫崇利[1] 李福荣[1] 王庆璋[1] 李静[1] 

机构地区：[1]山东海洋学院海洋化学系

出　　处：《山东海洋学院学报》1980年第4期42-51,共10页

摘　　要：本文研究了用阳极溶出伏安法测定海水中的砷(Ⅲ)和总砷。用玻碳电极同位镀金直接测定砷(Ⅲ);用过硫酸钾消化后,亚硫酸钠将砷(Ⅴ)还原成砷(Ⅲ)而测得总砷。本方法的检出限达3×10^(-10)M。回收率砷(Ⅲ)为106±4％,总砷为101±11％。样品经过简单的预处理能得到较好的重现性。A method for the determination of arsenic ( Ⅱ ) and total arsenic in sea water by anodic stripping voltammetry was investigated. By the simut-aneous deposition of gold and arsenic directly onto the glassy carbon electrode, arsenic ( Ⅱ ) was determined. The successful procedure for the determination of arsenic ( Ⅴ ) involved digesting by K2S2O3 and reducing arsenie ( Ⅴ ) to arsenic ( Ⅱ ) by Na2SO3 as reducing agent, then the total arsenic was determined, The detection limit was 3 ×10-10M. The recoveries for As(Ⅱ)and As ( Ⅴ )were 106± 4 % and 101×110% respectively. The satisfactory reprcducibility was obtained only after a sample was pre -treated by heating.

关 键 词：阳极溶出伏安法 砷 海水化学 回收率 测定方法 

分 类 号：P734.21[天文地球—海洋化学]