ICP——AES测定金属元素铜活动态及其初步应用

Primary Application of ICPAES Analyzer in Determining Mobile Forms of Copper Element

摘要:

金属元素活动态是我国5种深穿透地球化学技术中应用最广的方法之一。此方法是通过提取地表土壤一定深度介质中元素活动态的微弱隐伏矿信息而找寻隐伏矿，属于通过直接信息找矿，目前该方法的标准化程度不高。为将铜元素活动态应用于地质找矿，该文对铜元素4个活动态的相态(水浸出态、粘土吸附态、有机链合态、铁锰氧化物态)循序提取的条件及ICPAES测定技术进行了研究，包括采样深度、分析样品粒度、样品存放时间、提取条件、测定干扰等，通过对铜活动态提取液处理方法的改进，提高了分析速度和分析数据的精度。由实验数据计算出各相态方法的检出限和精密度RSD(n=10),水浸出态为0.079mg/L,13.90%～22.49%;粘土吸附态为0.275mg/L,11.99%～23.29%;有机链合态为0.362mg/L,10.70%～57.27%;铁锰氧化物态为0.230mg/L,17.83%～38.61%。该方法操作方便，精密度较好，应用于碑楼隐伏铜矿的野外探测实验,探测结果所圈定的综合异常与实际矿体的水平投影相符，取得了较满意的试验效果，该方法可应用于不同地质景观区。

Abstract:

Mobile forms of elements is one of the most widely used method in five deeppenetrating geochemical techniques. It is a method to find concealed deposit through extracting weak concealed information of mobile forms of elements in a certain depth of soil surface. It belongs to a direct ore prospecting method through information. At present, standardization of this method is not high. In order to apply mobile forms of copper element in geological prospecting, sequential extraction conditions of four mobile phases of copper element (water extraction phase, clay adsorbed phase, organic chain contact phase, iron and manganese oxide phase) and ICPAES measurement techniques have been studied, including sampling depth, grain size analysis of samples , sample storage time, the extraction conditions and the measured interference. Through improvement of extraction processing methods of mobile forms of copper element, analysis speed and accuracy have been improved. Through experimental data, detection limits and precision of each phase is RSD (n=10), water extraction phase is 0.079mg/L and 13.90%~22.49%, clay adsorbed phase is 0.275mg/L and 11.99%~23.29 %; organic contact phase is 0.362mg/L and 10.70%~57.27%; iron and manganese oxide phase is 0.230 mg/L, 17.83%~38.61%. The method is convenient to operate and the precision is better. This method is applied in field prospecting experiment of Beilou concealed copper deposit. It is showed that integrated anomaly circled by using detection results are confirm with Horizontal projection of actual ore bodies, and achieved a satisfied test result. This method can be applied in different geological landscape areas.