碘量法测定金泥中的金

介绍了采用活性炭吸附碘量法测定金泥中金含量的实验研究，先用王水溶解试样中的金，经活性炭吸附后炭化、灰化，再采用Na₂S₂O₃标准溶液滴定法测定金泥中的金含量。实验提出了碘量法的最佳条件选择，探讨了活性炭的加入量、过滤速度、碘化钾的加入量、温度和试样的均匀性对金分析结果的影响，并对金泥样品进行了加标回收率实验，金的回收率在97%～108%之间，进行精密度实验（RSD，n=6），测定相对标准偏差均＜0.50%，对氰化金泥金含量为10%~30%的样品分析结果与火试金重量法结果相吻合。该方法快速准确、低成本且污染小。

Determination of Gold in Gold Mud by Iodimetry Method

The determination of gold in gold mud by activated carbon absorption and iodimetry method was carried out.The gold mud was dissolved by aqua regia and ashed after activated carbon absorption,and then the gold was measured by Na2S2O3 titration.The optimum analytical conditions were ascertained.In this paper,the main analytical conditions such as the addition of activated carbon,speed of filtration,addition of KI,temperature and uniformity of samples were discussed on the effect of gold analysis.Gold mud was used for addition recovery tests by the method,the recoveries for gold were in the range of 97%-108%.The relative standard deviation of the sample determination results（RSD,n=6）were less than 0.50%.The analysis results in cyanidation gold mud between 10% and 30% were consistent with fire assay weight method.The method is suitable for gold in gold mud in range of 10%-30%,and has the advantage of quick,accurate,low cost and low pollution.