2-(3,5-二氯-2-吡啶偶氮)-5-二乙氨基酚分光光度法测定啤酒中微量铬的研究  

Determination of Trace Chromium in Beer by Spectrophotometry with 2-(3,5-Dichlor-2-Pyridlazo)-5-Diethylaminophenol(3,5-DiCl-PADAP)

作　　者：邓保炜[1] 

机构地区：[1]榆林学院能源化工研究中心,陕西省榆林市崇文路2号719000

出　　处：《光谱实验室》2009年第4期912-914,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：在0.09—0.16mol·L-1硫酸介质中,Cr2O72-与2-(3,5-二氯-2-吡啶偶氮)-5-二乙氨基酚作用,形成二离子缔合物,最大吸收波长533nm,表观摩尔吸光系数为为4.51×104L·mol-1·cm-1,铬含量在0—3.3μg·mL-1内符合比耳定律,用于啤酒样品中微量铬的测定,结果满意。In the dilute H2SO4 medium of C（H2SO4） 0.09—0.16mol·L^-1,trace amounts of Cr2O7^2- react with protonated 3.5-dicl-PADAP to form a ion-association complex having its maximum absorption at 553nm and a molar absorptivity of 4.51×10^4L·mol^-1·cm^-1.Beer s law is obeyed in the range of 0—3.3μg·mL-1 for chromium.The method was used in the determination of Cr2O7^2- in beer,and results were satisfactory.

关 键 词：2-(3 5-二氯-2-吡啶偶氮)-5-二乙氨基酚 啤酒 微量铬 分光光度法 

分 类 号：O657.32[理学—分析化学]