N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲与铜的显色反应及应用  

Spectrophotometric Study on the Reaction between Copper and N m Methyl N′ (sodium p aminobenzesulfonate) Thiourea

作　　者：马东兰[1] 侯凤莲[1] 马狂飚 李建平[1] 王玉炉[1] 

机构地区：[1]河南师范大学化学系

出　　处：《岩矿测试》1999年第1期56-57,共2页Rock and Mineral Analysis

基　　金：河南省自然科学基金

摘　　要：研究了新试剂Ｎ－间甲苯基－Ｎ′－（对氨基苯磺酸钠）硫脲（ＭＭＰＴ）与Ｃｕ２＋的显色反应。结果表明，在ｐＨ４．６～５．６的ＨＡｃ－ＮａＡｃ介质中，Ｃｕ２＋与ＭＭＰＴ形成的配合物至少稳定５ｈ，其λｍａｘ＝３７０ｎｍ，表观摩尔吸光系数为１．１２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｃｕ２＋的质量浓度在０．０８～１．４ｍｇ／Ｌ时符合比尔定律，相关系数ｒ＝０．９９９１。方法简便、快速，用于铅矿中铜的分析，测定结果与监控样推荐值相符，对ｗ（Ｃｕ）＝０．８％的试样测定６次，ＲＳＤ＝３．２％。A new method for spectrophotometric determination of trace copper with MMPT is reported in this paper. In the medium of HAc NaAc buffer solution (pH 4.6～5.6), MMPT reacts with copper to form a stable complex and the maximum absorbance is at 370.0 nm with an apparent molar absorptivity of 1.12×10 5 L·mol -1 ·cm -1 . Beer's law is obeyed in the concentration range of 0.08～1.4 mg/L for Cu 2+ with correlation coefficient of r = 0.999*!1 . The method is simple, rapid, sensitive and has been applied to the determination of Cu 2+ in lead ores with satisfactory results. The precision is 3.2% RSD ( n =6) at w (Cu)=0.8% level.

关 键 词：N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲 分光光度法 铜 

分 类 号：O614.121[理学—无机化学]