摘要
在聚乙烯醇（ＰＶＡ）存在下，锗与钨酸钠形成的杂多酸在酸性介质中与罗丹明Ｂ发生离子缔合显色反应；该缔合物的λｍａｘ为５８５nm；表现摩尔吸光系数为２．４１７×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，锗量在０－０．５μｇ／２５ｍＬ范围内服从比耳定律，缔合物可稳定６０ｈ以上．缔合物中Ｇｅ、Ｗ和ＲＢ的摩尔比为Ｇｅ：Ｗ：ＲＢ＝１：１２：４．考察了３０多种共存离子的影响，大多数常见元素不干扰锗的测定，本法用于人参样品中锗的测定，获得满意的结果．
A Colour reaction of ion-association complex of the germanium(Ⅳ)-TungstaleRhodamine B has been studied in 0.76--0.96mol·L－1 sulfuric acid medium and 0.08%polyvinyl alcohol (PVA) salution. The maximum absorbance of the ion-assodation complexis at 583nm. The apparent molar absorptivity is 2.417 x 10 6 L·mol－1. cm-1. Beer's law isobeyed in the range of 0-0.5μg/25ml for germanium. The ion-association complex was stablefor at least 60h. The molar ratio of Ge to W to RB in the ion-association Complexwas established to be 1:12:4. The influence of 38 diverse ious was examined. Most Commonions do not interfere. The method can be applied to the spectrophotometric determination ofmicro germanium in some ginseng with satisfactory results.
出处
《云南民族学院学报（自然科学版）》
1999年第4期37-40,共4页
Journal of Yunnan University of The Nationalities(Natural Sciences Edition)
关键词
锗
测定
光度法
罗丹阳B
钨酸钠
显色反应
Determination of germanium, Spectrophotometry, Rhodamine B, Tungstogermamate heteropoly acid
