摘要
研究了以Cu^(2+)为催化剂的Mo(V)-SCN^--ERB^+-PVA超高灵敏新显色体系及钼的分光光度测定条件。缔合物的吸收峰在580nm处,表观摩尔吸光系数ε=5.6×10~6L·mol^(-1)·cm^(-1)。Mo(Ⅵ)含量在0～0.3μg/25mL范围内符合比耳定律。初步研讨了显色反应的机理。结合离子交换分离,本法可成功地用于水样及麦饭石浸出液中痕量钼的测定。
A superhigh sensitive spectrophotometric method has been developed for determinationof trace molybdenum, based on the formation of a complicated ion-associated complex ofmolybdenum with ethyl rhodamine B (ERB) and thiocyanate in the presence of polyvinylalcohol (PVA_(124)). Cu^(2+) was used to catalyze the reduction of Mo(Ⅵ) to Mo(Ⅴ) carriedout by thiocyanate in Mo(Ⅴ)-SCN--basic dye system. The ion-associate exhibits maximumabsorption at 580nm, its apparent molar absorptivity is 5.6×10~6 L·mol^(-1)·cm^(-1). Beer's law isobeyed for 0-0. 3μg/25mL of Mo(Ⅵ). The reaction mechanism has been discussed. Themethod has been used for the determination of trace Mo in water and in leaching solutionof Maifan stone with satisfactory results.
出处
《应用化学》
CAS
CSCD
北大核心
1991年第2期37-41,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
关键词
显色反应
分光光度法
钼
测定
superhigh sensitive colour reaction
molybdenum
ethyl rhodamine B
spectrophotometry
