APDC-MIBK萃取石墨炉原子吸收法测定地质样品中痕量钯

近年来金矿源岩研究引起国内外地质学家的极大关注。贵金属元素把具有双重特性,在超镁铁质岩浆结晶过程中性状与金相近,表现出强烈亲硫的特点,新鲜的没有发生过任何金流失的岩石,二者比值近似为一常数。把在成岩乃至于变质作用过程中呈惰性,保持其原始含量不变而又与金性状完全不同,这种双重性特征有可能借助于常数K=Au(原)/Pd(原),推算出没有发生过任何金流失时的岩石原始金含量(王建安,1986)。即通过样品中把的分析值求得原始金含量,借此对金矿源岩进行研究与判定。

DETERMINATION OF TRACE PALLADIUM IN GEOLOGICAL MATERIALS BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY AFTER EXTRACTION WITH APDC-MIBK

A method was developed for determination of trace Pd in geological materials in this paper. Palladium is extracted into methylisobutyl ketone(MIBK)from strong acid medium using ammonium pyrolidine dithiocarbamate(APDC)as the ligand.The organic phase is analysed for Pd by graphite furnace atomic absorption spectrometry(GFAAS). The best conditions of determination of Pd have been studied. The sensitivity of this method is higher than others. its characteristic mass is 1.68?10-11g/1% absorption. In order to measure the precision of this method, single analyses of the sample 72-Pt-01 were conducted ten times. The standard deviation was 0.005; the relative standard deviation was 18.7%. Five standard rocks and ores have been analysed by this method. Analysis values are similar to the published values.