用亚硝基R盐螯合树脂分离富集催化极谱法测定矿石中的铱

Determination of Iridium in Rocks by Separating and Enriching with Nitroso R Salt Chelating Resin and Catalytic Polarography

本文研究了利用亚硝基Ｒ盐螯合形成的树脂、分离富集试液中痕量贵金属元素铱的实验条件。并利用ＪＰ－１Ａ型示波极谱仪，在１．５０ｍｏｌ／Ｌ盐酸＋５．０×１０^（－５）ｍｏｌ／Ｌ硫脲＋０．２ｍｏｌ／Ｌ碘化钾＋碲（ρ（Ｂ）＝０．４ｍｇ／Ｌ）的混合底液中，对铱进行极谱催化波测定。在示波极谱仪上峰电位约－０．５５Ｖ（银汞齐为参比电极），可测定试液中５．０×１０^（－８）～１．０×１０^（－９）ｍｏｌ／Ｌ的痕量铱，检出限可达１．０×１０^（－１０）ｍｏｌ／Ｌ，回收率在９５％～１１０％之间，相对标准偏差为３．５％，本方法可用于测定矿石中痕量铱。

Some experimental conditions of the determination of trace iridium in rocks have been studied.Iridium was first separated and enriched with nitroso R salt as chelating resin, then detected by Catalytic polarogrphy with a Model JP-1A polarograph in the mixed supporting electrolyte of 1.50 mol/L HCI +5.00×10￣(-5)mol/L CH_4N_2S_0. 20mol/L+Te[ρ(B)=0.4mg/L].The peak potential for Ir was-0.55 V vs silver amalgam electrode. The Iinear range was from 5.0×10￣(-8)to 1.0×10￣(-9)mol/L. The detection limit was 1.0×10￣(-10)mol/L,and the recovery was between 95%～110%. The method can be used to determine trace Ir in rocks.