以二溴茜素紫为显色剂吸收比-分光光度法测定地面水中痕量铜(Ⅱ)  

Absorption Ratio-Spectrophotometric Determination of Trace Amounts of Copper(Ⅱ) in Surface Water by the Color Reaction with Dibromo Alizarin Violet

作　　者：汤轶男[1] 房贻龄 侯波 赵丹华[1] 李田[1] 郜洪文[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092 [2]安徽省淮北市环境监测站,淮北235000 [3]山东大成农药股份有限公司,淄博255009

出　　处：《理化检验（化学分册）》2009年第7期768-771,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家"十一五"科技支撑计划(No.2008BAJ08B13)

摘　　要：在pH6．35的乙酸盐缓冲介质中并加入氟化物作为掩蔽剂，铜（Ⅱ）与二溴茜素紫（DBAV）生成二元配合物Cu（DBAV）2，利用光谱修正法表征配合物的分子结构。选择吸收光谱峰谷波长607，548nm为工作波长，测定显色溶液及空白的吸光度A607nm，A548nm及A607nm，A548nm。计算光吸收比差值（△Ar）。当铜离子浓度在0．15mg·L^-1以内与△Ar值之间呈线性关系，方法的检出限（3σ）为2．5μg·L^-1。分别对长江及黄浦江水样中痕量铜（Ⅱ）进行了测定，结果与电感耦合等离子体原子发射光谱法的测定结果相符，方法的回收率在100％～108％之间。In an acetate buffer medium of pH 6.35, a binary coordination complex of Cu（DBAV）2 was formed by the reaction of Cu（ Ⅱ ） with dibromo alizarin violet （DBAV）, and its molecular structure was characterized by the spectral correction method. Wavelengths of the crest and trough in the absorption spectrum of the coordination complex were found at 607 ran and 548 nm respectively. Values of absorhance of the colored complex solution and the blank solution were measure at both wavelengths （recorded as A607nm,A548nm and A＇607nm amd A＇548nm） and value of difference of absorption ratio （△Ar） was calculated. Linear relationship between values of △Ar and concentration of Cu（ Ⅱ ） ion was found in the range within 0. 15 mg · L^-1 , and the detection limit （3σ） found was 2. 5 μg · L^-1. The proposed method was used in the determination of trace amount of copper（Ⅱ） in surface water taken from Yangtze River and Huangpu River, giving results in consistency with the results found by ICP-AES method, and the values of recovery found were ranged from 100% to 108%.

关 键 词：吸收比-分光光度法 铜离子 二溴茜素紫 地面水 

分 类 号：O657.32[理学—分析化学]