金川铜镍矿区土壤多元素相态分析方法

Multi-element Phase Analysis Method for the Soil with Nickel-Copper Deposit in Jinchuan

发展了土壤中多元素（Cr、Co、Ni、Cu、Zn、Pb、Au）的相态分析方法.按提取剂由弱到强,将相态划分为：水溶态、黏土吸附态（离子交换态）、碳酸盐态、有机质结合态、铁锰氧化物结合态、硫化物态、残渣态（石英结合态）7个相态.利用ICPMS法测Cr、Co、Ni、Cu、Zn、Pb；原子吸收法测Au.利用该相态分析方法,对金川矿区的土壤进行了分析,7个相态的加和与总量分析结果基本相符.5个相态中7个元素的方法精密度RSD（n=6）分别为：2.79％～14.91％（水溶态）；0.90％～10.00％（黏土吸附态）；1.00％ ～ 17.50％（碳酸盐态）；1.92％～12.31％（有机质结合态）；2.15％ ～ 13.51％（铁锰氧化物结合态）.

Multi-element（Cr,Co,Ni,Cu,Zn,Pb,Au） phase analysis methods for the soil have been developed.Phase analysis was an effective method for geochemical prospecting.By extraction agent from weak to strong,the phase is divided into 7 phases：water extactable phase,clay-adsorbed （exchangeable） phase,carbonate phase,organic phase,iron and manganese oxides phase,sulfide phase,quartz combined phase.The contents of copper,nickel,zinc,lead,cobal and crome were determined by using inductively coupled plasma mass spectrometry,and the content of gold was determined by using atomic absorption spectrometry.The methods have been applied to the multielement phase analysis of the soil samples in Jinchuan deposit and the sum of content in 7 phases are all in agreement with total contents.The relative standard deviations of 7 elements each phase are：2.79％ ～14.91％ （water extactable phase）,0.90％ ～ 10.00％ （clay-adsorbedphase）,1.00％ ～ 17.50％ （carbonate phase）,1.92％ ～ 12.31％ （organic phase）,2.15％ ～13.51％ （iron and manganese oxides phase）,respectively.