封闭溶样-泡塑富集火焰原子吸收法测定矿石中的金

本次研究用王水封闭溶解试样中的金，经泡沫塑料富集后硫脲解脱，采用火焰原子吸收法测定矿石中金的含量。同时，探讨了泡塑富集酸度、富集温度、富集时间、硫脲解脱液浓度及解脱时间等因素对分析结果的影响，得出了最佳实验条件。此外，通过对比分析泡塑富集与活性炭富集、封闭溶样富集与敞口溶样富集这2对方法，得出封闭溶样—泡塑富集具有操作简便、快速、成本低、易掌握、准确度高及干扰元素少等优点。本方法的检出限为0.02 mg/L，精密度（RSD，n=6)为0.80%~4.71%，加标回收率98.57%~101.75%，金矿石测定结果与标准值相符。

Determination of Gold in Ore Samples by Flame Atomic Absorption Spectrometry of Sealed Dissolution-foam Enrichment

The determination of gold in ore samples was sealed dissolved by aqua regia and extracted by thiourea solution after foam enrichment,and then was measured by FAAS.The main influencing factors were discussed,such as the acidity of foam enrichment,temperature of enrichment,time of enrichment and the concentration of thiourea solution,time of disengagement etc.The best conditions was obtained through the experiment.The foam enrichment was compared with activated carbon enrichment,and sealed dissolution was compared with opened dissolution.The sealed dissolution-foam enrichment is convenient,fast,low-cost,easy to operate and the result is accurate,the interference element is fewer.The detection limit of this method is 0.02 mg/L,RSD is in the range of 0.80%～ 4.71% and the recovery of standard addition is 98.6%～101.8%.The method was applied to the determination of national standard reference materials and the results are in agreement with the certified values.