乙醇介质制备载炭泡塑及其在地质样品金测定中的应用

Application of Carbon-loaded Polyurethane Foam Produced by Ethanol Media in Determination of Gold in Geological Samples

载炭泡塑相较于无负载泡塑,可有效提高泡塑对金的吸附能力,但现有制备载炭泡塑的方法制备效率不高。为了缩短制备载炭泡塑的时间,提高制备效率,本文采用活性炭-乙醇溶液制备载炭泡塑,通过优化制备条件,包括负载介质的种类、试剂浓度、浸泡时间,使得制备100个载炭泡塑的时间可以控制在30 min之内,并结合ICP-OES建立了测定地质样品中金的方法。实验结果表明:该方法的振荡时间可以缩短至20 min。金的质量浓度在0～100. 00μg/mL范围内与光谱强度呈良好的线性关系,相关系数为0. 9997,方法检出限(3σ)为0. 0066μg/g,测定结果相对标准偏差为0. 81%～2. 11%(n=10)。该方法经4个国家标准物质验证,准确度与精密度良好,能够满足地质样品中金的分析测试要求。

BACKGROUND:Compared with unloaded polyurethane foam,carbon-loaded polyurethane foam can effectively increase the adsorption capacity of gold,but the existing preparation method of carbon-loaded polyurethane foam is not efficient.OBJECTIVES:To shorten the preparation time of carbon-loaded polyurethane foam,improve the preparation efficiency,and optimize experimental conditions.METHODS:Activated carbon-ethanol solution was used to prepare carbon-loaded polyurethane foam.By optimizing conditions such as the load medium type,reagent concentration,and soaking time,the time for preparing 100 carbon-loaded polyurethane foams can be reduced to under 30 min.A method for the determination of gold in geological samples by Inductively Coupled Plasma-Optical Emission Spectrometry(ICP-OES)combined with carbon-loaded polyurethane foam is described.RESULTS:The experimental results show that the oscillation time can be shortened to 20 min.The mass concentration of gold has a good linear relationship with the spectral intensity in the range of 0-100μg/mL with the correlation coefficient of 0.9997.The detection limit(3σ)is 0.0066μg/g,and the relative standard deviations of the results are 0.81%-2.11%(n=10).CONCLUSIONS:Four certified reference materials of gold ore are used to evaluate the method.The results show good accuracy and precision,and the method meets the requirements of geological sample analysis.