N-癸基-N′-(对氨基苯磺酸钠)硫脲与铜(Ⅱ)的显色反应及其分析应用  

Spectrophotometric Study of the Reaction between Copper(Ⅱ) and N-Decyl-N '-(sodium p-aminobenzenesulfonate) thiourear(DPT)

作　　者：侯凤莲[1] 魏新军[2] 马狂飚[1] 马东兰[1] 

机构地区：[1]河南师范大学化学系,新乡453002 [2]河南职业技术师范学院化学系,新乡453002

出　　处：《冶金分析》1999年第5期19-20,18,共3页Metallurgical Analysis

摘　　要：研究了水溶性光度试剂Ｎ－癸基－Ｎ’－（对氨基苯磺酸钠）硫脲（ＤＰＴ）与铜（Ⅱ）的显色反应条件。结果表明，在ｐＨ４.８～５．２的ＨＡｃ－ＮａＡｃ介质中，Ｃｕ（Ⅱ）与ＤＰＴ形成稳定的摩尔比为１：３蓝色络合物；工作曲线的线性范围在５～３０μｇ／２５ｍＬ和３０～６５μｇ／２５ｍＬ，相关系数分别为０．９９９１和０．９９８７，摩尔吸光系数分别为５．８１×１０~４和３．１×１０~４．最大吸收波长为３３６．６ｎｍ。当有Ｆｅ^(３＋)存在时，加ＮａＦ掩蔽。本方法操作简便，快速，选择性较好。用于铅矿中铜含量测定，所得结果及回收均满意。A new method of spectrophotometric determination of microamount copper with DPT is presented. In the medium of HAc-NaAc buffer solution at pH4.8-5.2, DPT reacts with copper to form a stable blue complex of Cu^(2+): DPT =1: 3, and the maximum absorption of this complex is found to be at 336.6 nm with two apparent molar absorptivity of 5.81×10~4L·mol ^(-1)·cm^(-1) and 3.1×10~4L·mol^(-1)·cm^(-1) Beer's law is obeyed in the concentration range of 5-30μg/25mL and 30-65μg/25mL for Cu^(2+) respectively. The method is simple, rapid, sensitive and has been applied to the determination of Cu in lead ore sample with satisfactory results.

关 键 词：对氨基苯磺酸钠 硫脲 铜 分光光度法 显色反应 

分 类 号：O614.121[理学—无机化学]