金的活动态分析方法及其应用

在金相态分析方法的基础上,对金活动态分析方法进行了如下改进:用5 μm孔径的滤膜取代2 μm孔径的滤膜抽滤;将加入提取剂溶液提取黏土吸附相、有机结合相和铁锰氧化物相改为直接加入固体提取剂;将泡沫塑料吸附-原子吸收法改为甲基异丁基酮(MIBK)萃取-原子吸收法测定金。介绍了改进后的金活动态分析方法及其在东北高寒森林覆盖景观某金矿区的一个应用实例。结果表明,除水提取相异常相对不明显外,其余3个相在矿体上方均有清晰、明显的异常指示。其中有机结合相的异常强度最大,是在该景观条件下寻找隐伏矿的最有利相态。重复样分析的相对误差小于50%,满足金的活动态分析要求。

THE ANALYTICAL METHOD FOR MOBILE FORMS OF GOLD AND ITS APPLICATION

The analytical method for mobile forms of gold has been improved by the authors and a new analytical method is put forward in this paper. The method was used to analyze mobile forms of gold in a large number of samples. An application case in a gold deposit within a cold forest landscape area in Northeast China is cited. The results show that adsorbed and exchangeable,organically bound and occluded forms of gold in Fe-Mn oxides can show evident anomalies over the ore bodies, with the anomalies of organically bound gold being the strongest. Organically bound gold is the most effective mobile form in search for buried gold deposits in this kind of landscape areas. The relative error of analytical duplicates is less than 50% ,which can meet the analytical requirement for mobile forms of gold.