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针对金精矿和氰渣中金含量的测定方法——封闭溶样活性炭吸附碘量法,在应用过程中存在样品溶解不彻底,分析结果偏低等问题,通过大量的调研和实验提出改进方案,即试样经硝酸脱硫,采用NH4HF2-HCl-KM-nO4溶解体系溶解样品中的金,使试样中的金完全被溶解,所得分析结果具有良好的重现性。该方法经国家一级标准物质验证,测定结果与标准物质吻合,其精密度(RSD,n=5)小于0.5%。该方法又与火法试金、其他实验室以及生产样品测试数据对比等,均获满意结果。
Aiming at the determination of gold content in gold concentrate and cyanide residue, closed-sample activated carbon adsorption iodine method, there are some problems in the process of application, such as incomplete dissolution of samples and low analysis results. Through a lot of research and experiments, , That is, the sample was desulfurized by nitric acid, NH4HF2-HCl-KM-nO4 dissolution system was used to dissolve the gold in the sample, so that the gold in the sample was completely dissolved. The obtained analysis result showed good reproducibility. The method is validated by the national first-class reference materials. The results are in good agreement with the standard materials and the precision (RSD, n = 5) is less than 0.5%. The method again with the fire test gold, other laboratories and production samples test data comparison, etc., are satisfied with the results.