铜-MTB-CTMAB-β-CD显色体系的研究应用

Study and Application of the Chromogenic Reaction System of Cu-MTB in the Present of CTMAB,β-CD

研究了在表面活性剂溴化十六烷基三甲基铵（CTMAB），β-环糊精（β-CD）存在的条件下，铜与显色剂甲基百里香酚兰（MTB）的显色反应．试验结果表明，在pH＝9.5的NH3－NH4Cl缓冲介质中，配合物的最大吸收波长λmax＝56000，表观摩尔吸光每系数ε=1.032×104L·mol-1·cm-1，浓度在0～50μg／25mL范围内符合比百定律．适用于豆类及水中微量铜的测定．

The chromogenic reaction of copper with Methyl Thymol Blue in the presence of cetyltrimethylammoniun bromide,β-circle dextrin has been studied.The maximum absorption is found at 560 nm with its apparent molar absorptivity of 1 .032×104. Beer's law is obeyed in the range of 0~ 50μg / 25ml.The method proved to be statisfactory for the direct detcrmination of copper in bean and water.