在表面活性剂OP存在下,用DDPBC分光光度法测定微量钼

Spectrophotometry of Micro-Molybdenum by Using DDPBC in the Presence of Surfactant OP

本文研究了钼与6,7—二羟基—2,4—二苯基苯骈吡喃氯化物(简称 DDPBC),在 OP存在下的显色反应。测钼的摩尔吸光系数(ε)达到5.6×10~5。在弱酸性介质中,Mo(V1)与 DDPBC生成一种橙红色络合物,其组成比为1∶2(Mo∶DDPBC)。最大吸收峰在 532nm 处。在浓度0～12.0mg/10ml 范围内符合比尔定律。本法应用于簇合物中钼的测定时,结果满意。

In the presence of the surfactant OP,the colour reaction of molybdenum with 6,7-di- hydroxyl-2,4-diphenyl-benzopyranyl chloride(DDPBC)is described.In a weak acid medium, the molybdenum(Ⅵ)can react with the indicator(DDPBC)to give an orange-red complex with maximum absorbance at 532 nm.The composition ratio is Mo:DDPBC=1:2.The molar ab- sorptivity is 5.64×10~5 L·mol^(-1)·cm^(-1).This method has been used for determination of molyb- detum in transition metal cluster compounds with satisfactory result.