2-(2-噻唑偶氮)-对甲苯酚-SCN^-体系分光光度法测定微量亚硝酸根  

Spectrophotometric Determination of NO_2^- with 2-(2-Thiazolylazo)-p-Cresol and SCN^-

作　　者：吴兰菊[1] 方克鸣[1] 陈建荣[1] 周海潮[1] 

机构地区：[1]浙江师范大学化学与生命科学学院,浙江省金华市321004

出　　处：《光谱实验室》2005年第4期723-726,共4页Chinese Journal of Spectroscopy Laboratory

摘　　要：本文研究了在较浓的硫酸介质中2-(2-噻唑偶氮)-对甲苯酚(简称TAC)质子化的酸度条件,及其与硫氰酸根、亚硝酸根离子形成三元离子缔合物的最佳条件,提出了测定微量亚硝酸根的新方法。在(1+1)H2SO4介质中,该三元离子缔合物的最大吸收波长位于380nm处,表观摩尔吸光系数为2.93×104L·mol-1·cm-1,亚硝酸根含量在0—20μg/25mL范围内符合比耳定律。方法应用于环境水样中微量亚硝酸根的测定,回收率达92%—95%。In a H2SO4 medium, trace amounts of NO^-2 was determined based on the reaction of NO^-2 with SCN^- and protonated TAC[2-（2-thiazolylazo）-p-cresol] to form a ternary association complex with an absorption at 380nm and a molar absorptivity of 2.93×10^4L·mol^-1·cm^-1. Beer＇s law is obeyed in the range of 0 to 20μg of NO^-2 per 25mL of solution. The method has been used in the determination of NO^-2 in water with the recoveries of 92%-95%.

关 键 词：2-(2-噻唑偶氮)-对甲苯酚 亚硝酸根 分光光度法 三元离子缔合物 环境水样 

分 类 号：O657.32[理学—分析化学]