流动注射-吐温40化学发光新体系测定贵金属冶金物料中微量铱

Determination of Trace Iridium in Noble Metal Samples by Flow Injection Tween 40 New Chemiluminescent System

本文研究了吐温４０－ＫＯＨ－Ｈ２Ｏ２－Ｉｒ（Ⅳ）化学发光新体系，采用流动注射进样技术，建立了测定铱的新的化学发光分析法，检测限为１．１×１０－１３ｇ／Ｌ；线性范围为每ｍＬ１．０×１０－９～１．０×１０－５ｇ。经离子交换分离Ａｕ（Ⅲ）和Ｏｓ（Ⅳ）离子后，测定贵金属冶金物料中微量铱，结果满意。

A new chemiluminescent mothod was established for the determination of Ir(Ⅳ) by flow injection,based on chemiluminescent system of Tween 40 KOH H 2O 2 Ir(Ⅳ).The detection limit was 1.1×10 -10 g/mL,with a linear range of 1.0×10 -9 ～1 0×10 -5 g/mL and a relative standard deviation of 3.2% for 1.0×10 -8 g/mL Ir(Ⅳ).Interferences of Au(Ⅲ) and Os(Ⅳ) ions were eliminated by ion exchange spearation.Ir(Ⅳ) in noble metal samples was determined with satisfactory results.