超高灵敏显色反应及其应用的研究 Ⅶ.生命活性元素钼的高灵敏光度法  

Studies on Superhigh Sensitive Colour Reactions and Their Applications——Ⅶ.High-sensitive Sectrophotometric Determination of Molybdenum——one Activated Element in Life

作　　者：滕毓敏[1] 许生杰 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《分析化学》1991年第5期514-518,共5页Chinese Journal of Analytical Chemistry

摘　　要：本文研究以钒(Ⅴ)作催化剂的 Mo(Ⅵ)-SCN^--RB^+-PVA_(124)超高灵敏显色体系和钼的分光光度测定条件。缔合物的吸收峰在588nm处,表观摩尔吸光系数高达2.0 x 10~7L·mol^(-1)·cm^(-1)。铜浓度在0～80ng/25ml 范围内符合比耳定律。并进一步研讨了本类显色反应的吸附机理.所制定的方法结合离子交换分离,已用于水样和麦饭石浸出液中钼的测定,结果较满意。测定下限可达0.1ppb(50ml 液样)A superhigh sensitive spectrophotometric method was developed for the deter- mination of trace molybdenum,based on the formation of a complicated ion-association complex of molybdenum with rhodamine B(RB) and thiocyanate in the presence of polyv- inyl alcohol(PVA-124).V(V)was used to catalyze the reaetion of reducing Mo(Ⅵ)to Mo(Ⅴ)by thiocyanate.The ion-association complex exhibits maximum absorption at 588nm, its apparent molar absorptivity is 2.0×10~7 L.mol^(-1)·cm^(-1).Beer's law is obeyed in the range of 0～80ng/25ml for Mo(Ⅵ),The reaction mechanism has been discussed,the molar ratio of Mo to RB was found to be about 1:400 by molar absorptivity contrast method.The pro- posed method has been used for the determination of Mo in water and leaching solution of Maifan stone with satisfactory results.

关 键 词：钼 测定 超高灵敏 显色反应 

分 类 号：O614.612[理学—无机化学]