氯代磺酚S光吸收比差法测定环境水体中痕量铜  

Determination of trace copper in environmental water by light-absorption ratio variation approach with chlorosulphonphenol S

作　　者：赵丹华[1] 

机构地区：[1]广东第二师范学院化学系,广东广州510303

出　　处：《冶金分析》2013年第5期21-26,共6页Metallurgical Analysis

基　　金：广州市珠江科技新星专项(2012J2200055);广东第二师范学院博士专项研究基金(10ARF12)

摘　　要：在pH 4.05的醋酸-醋酸钠溶液中,显色剂氯代磺酚S(CSPS)与Cu?反应形成Cu-CSPS络合物,用光谱修正法表征其结构为[Cu2(CSPS)2(H2O)2]2-,利用此反应结合光吸收比差法建立了Cu?定量分析新方法。研究表明,显色剂溶液性质稳定,在适量F-掩蔽剂存在的条件下,测定0.050mg/L Cu?,500倍的Ca2+,250倍Mg2+,5倍Mn2+、Ni 2+、Cl-、NO2-、PO43-以及与Cu2+同倍的Zn2+、Co2+、Pb2+、Cd2+、Cr?、As?、Fe?、Fe?、Al?不影响测定。Cu?的检出限为1.35μg/L。方法用于两个天然水样中痕量铜的测定,结果与ICP-AES法的结果相吻合,相对标准偏差分别为1.4%和2.6%(n=7)。In the acetic acid-sodium acetate solution of pH 4.05,chromogenic reagent chlorosulphophenol S（CSPS）reacted with Cu（Ⅱ）to form a Cu-CSPS complex.The spectral correction indicated its structure was[Cu2（CSPS）2（H2O）2]2-.By combining this method with absorbance ratio difference method,a novel method for the quantitative analysis of Cu（Ⅱ） was established.Research indicated that the chromogenic reagent solution was stable.With the existence of an appropriate amount of F-masking agent,500times of Ca^2＋,250times of Mg2＋,5times of Mn^2＋,Ni 2＋,Cl^-,NO^2-,PO43and the equivalent amount of Zn^2＋,Co^2＋,Pb2＋,Cd^2＋,Cr（Ⅲ）、As（Ⅲ）、Fe（Ⅱ）、Fe（Ⅲ）、Al（Ⅲ） did not influence the determination of 0.050mg/L Cu（Ⅱ）.The detection limit of Cu（Ⅱ） was 1.35μg/L.The method was used for determining trace copper of two natural water samples,with results compared with those obtained by ICP-AES and RSD of 1.4%and 2.6%respectively（n=7）.

关 键 词：光谱修正 光吸收比差 氯代磺酚S 铜 环境水体 

分 类 号：O657.32[理学—分析化学]