5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯分光光度法同时测定铜和钴  

Simultaneous determination of copper and cobalt by spectrophotometry with 5-(5-nitro-2-pyridylazo)-2,4-diaminotoluene

作　　者：刘根起[1] 程永清[1] 张光[2] 

机构地区：[1]西北工业大学工程系,陕西西安710072 [2]陕西师范大学化学系,陕西西安710062

出　　处：《冶金分析》2003年第5期9-11,共3页Metallurgical Analysis

摘　　要：基于Cu ,Co 与5 (5 硝基 2 吡啶偶氮) 2,4 二氨基甲苯(简称5 NO2 PADAT)在弱酸性介质中均可发生灵敏的显色反应,但铜络合物可被EDTA或强酸分解,而钴络合物不被分解的特点,利用差减法建立了铜、钴同时测定的新方法。在10mL溶液中,0～7 0μg铜、0～3 6μg钴符合比尔定律,表观摩尔吸光系数分别为ε519Co=1 48×105。方Cu=6 70×104,ε586法用于镁合金及锌铝合金中铜、钴的同时测定,结果满意。A new system for spectrophotometric simultaneous determination of copper and cobalt with 5(5nitro2pyridylazo)2,4diaminotoluene(5NO2PADAT) has been developed,which is based on the different stabilities between Cu*! and Co*' complexes of 5NO2PADATBy addition of EDTA or strong mineral acid,Cu*!-5NO2PADAT complex can be dissociated while Co*'-5NO2PADAT complex can't beBeer's law is obeyed in the range of 070μg/10mL for Cu and 036μg/10mL for CoThe apparent molar absorptivities are 670×104L·mol-1·cm-1 for Cu*! at 519nm and 148×105L·mol-1·cm-1 for Co*' at 586nm, respectivelyThe method has been applied to simultaneous determination of copper and cobalt in alloys with satisfactory results

关 键 词：铜 钴 分光光度法 测定 5-NO2-PADAT 显色反应 

分 类 号：TG115.3[金属学及工艺—物理冶金]