用8－氨基喹啉高选择性分光光度法测定痕量锇的研究

Studies on the Highly Sensitive and Selective Spectrophotometric Determination of Trace Osmium

研究了用８－氨基喹啉在ｐＨ３．６２的ＨＡｃ－ＮａＡｃ缓冲溶液中测定痕量Ｏｓ（Ⅳ）的分光光度法。常用的非贵金属和贵金属离子不干扰测定，并且选择性较好。Ｏｓ（Ⅳ）与８－氨基喹啉的组成比为１：３，表观摩尔吸光系数ε６００＝１．３×１０＾５Ｌ／ｍｏｌ·ｃｍ。在０～１０μｇ／１０ｍＬ范围内符合比耳定律。合成样品分析结果良好。

A new sensitive colour reaction of Os(Ⅳ) with 8-amino quinoline has been studied.The complex has an absorption peak at 600 nm and the reagent exhibits maximum absorptivity in the ultraviolet region,so that they show a strong colour contrast.The apparent molar absorptivity was found to be 1.32×10￣5L/mol,cm.Beer's law is obeyed in the range of 0-10 μg of Os (Ⅳ)per l0 mL.It was also found that the complex reaction can be completed in 15-20 min,at 80-90℃ and pH 3. 62 kept in a HAc-NaAc buffer solution,The colour of solution is stable at least 24 h.The molar ratio of Os(Ⅳ) to 8-amino quinoline was establislied to be 1:3 by two methods, All other noble metals except Ru(Ⅳ) which gives a slight absorption at 600 nm do not give colour reaction with 8-amino quinoline,even so 20 times amount of Ru(Ⅳ) can be tolerated.All common base metals reacting with 8-amino quinoline give no absorption at 600 nm,This paper is considered superior in terms of simplicity,stability,sensitivity and selectivity.