二甲酚橙—溴化十六烷基三甲胺与铜(Ⅱ)钴(Ⅱ)的光度法研究及铜的测定  

Sepectrophotometric Studies on the Color Reaction of XO with Copper(Ⅱ) and Cobalt(Ⅱ) in the Presence of CTMAB and the Determination of the Trace Copper (Ⅱ) in the Alloy Steel

作　　者：刘二保[1] 卫洪清[1] 张瑞风[1] 刘保梅 史红霞[1] 耿长青[1] 

机构地区：[1]山西师范大学化学系,山西临汾041004 [2]洪洞冯张中学,山西洪洞041600

出　　处：《山西师范大学学报（自然科学版）》2001年第2期46-49,共4页Journal of Shanxi Normal University(Natural Science Edition)

摘　　要：本文研究了二甲酚橙 ( XO) -溴化十六烷基三甲胺 ( CTMAB)与铜 ( )、钴 ( )的显色反应 .结果表明 :在 p H8.0 ,溴化十六烷基三甲胺存在时 ,铜 ( )、钴 ( )与二甲酚橙能形成稳定的络合物 .其最大吸收波长均为 590 nm,摩尔吸光系数分别为 6.9× 1 0 4 L· mol- 1·cm- 1和3.6× 1 0 4 L· mol- 1· cm- 1.铜 ( )含量在 0～ 1 5.1μg/2 5m L内 ,钴 ( )含量在 0～1 8μg/2 5m L内符合比尔定律 .线性方程及回归系数分别为 :A=4.765× 1 0 - 3+ 0 .0 1 85C,γ=0 .9962 ;A=3.0 0 5× 1 0 - 3+ 7.481 C,γ=0 .9966.应用本法测定了铅合金标样中的微量铜 .The condition of Color reaction of Copper(Ⅱ), Cobalt(Ⅱ) with XO in the presence of CTMAB are studied. It is found that Copper(Ⅱ), Cobalt(Ⅱ) reacts with XO on the condition of CTMAB to form a stationary complex with maximum absorption at 590nm, the molar absorptivity of the complex is 6.9×10 4L·mol -1 ·cm -1 for Cu(Ⅱ) and 3.6×10 4L·mol -1 ·cm -1 for Co(Ⅱ), Beer′s Law is obeyed in the range of 0—15.1μg/25mL for Cu(Ⅱ) and 0—18μg/25mL for Co(Ⅱ). The method has been successfully applied to the determination of trace Cu(Ⅱ) in the alloy steel and better results are obtained.

关 键 词：二甲酚橙 铜 钴 分光光度法 

分 类 号：O614.121[理学—无机化学] O657.3[理学—化学]