恒电流计时电位溶出法测定环境水样中痕量银  

DETERMINATION OF TRACE AMOUNTS OF SILVER IN WATER BY DIFFERENTIAL CHRONOPOTENTIOMETRIC STRIPPING ANALYSIS

作　　者：张瑞[1] 田秋霖[1] 涂志文 周勤 

机构地区：[1]武北大学化学与分子科学学院,武汉430071

出　　处：《理化检验（化学分册）》2001年第5期200-201,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：采用玻碳电极 氯化银参比电极 铂对电极三电极系统的恒电流微分计时电位溶出分析 ,在0 .1mol·L- 1HNO3 0 .0 0 5mol·L- 1KNO3介质中 ,银在 - 0 .340V左右呈现良好的氧化溶出峰 ,用此峰可进行银的微分计时电位溶出分析。在 2 .5～ 12 0 μg·L- 1范围内银浓度与峰高呈线性关系 ,相关系数为 0 .9992 ,方法用于环境水样中痕量银的测定 。A new method for the determination of silver by potentiostatic differential chronopotentionmetric stripping analysis using the glassy carbon silver chloride platinum three electrode system was studied. In a medium of 0.1mol·L -1 HNO 3 0.005mol·L -1 KNO 3, silver shows an anodic stripping peak at about -0.34V ( vs . Ag AgCl). The analytical concentration range is 2.5μg·L -1 to 120μg·L -1 of silver, and its regression coefficient is 0.9992. The method has been applied to the determination of silver in water with satisfactory results.

关 键 词：恒电流微分计时电位溶出法 玻碳电极 银 环境水样 痕量分析 污染物分析 

分 类 号：X132[环境科学与工程—环境科学] X832