二溴羧基偶氮氯膦光度法测定钬铒

Spectrophotometric Determination of Holmium or Erbium with Dibromo-o-carboxychlorophosphonazo

研究新显色剂二溴羧基偶氮氯膦与稀土元素Ｈｏ 及Ｅｒ 的新显色反应体系， 生成蓝色络合物的λｍａｘ为６５０ｎｍ ， 灵敏度高， 分别为１－１０ ×１０５ 及１－１１ ×１０５ Ｌ·ｍｏｌ－ １·ｃｍ － １ ， Ｈｏ 及Ｅｒ 含量在０ ～３０μｇ／２５ｍｌ 浓度范围内符合比尔定律。方法选择性高， 在磷酸介质中测定有广阔的适用性， 可用于铂合金（ 王水溶样） 和银合金（ 硝酸溶样）

The colour reaction system of holmium or erbium with a new chromogenic reagent dibromo-o-carboxychlorophosphonazo has been studied.Holmium or erbium reacts with the reagent forming a blue complex which has an absorpion maximum at 650nm with the apparent molar absorptivity is 1 10×10 5 or 1 11×10 5 L·mol -1 .cm -1 ,respectively.Beer's law is obeyed in the range of 0～30μg/25ml for holmium or erbium.The coloration is sensitive and selectable.In phosphoric acid medium,the method has been applied to determine holmium,erbium in platinum-or silver-alloys.