微波消解-电感耦合等离子体发射光谱测定铜精矿中的银

铜精矿试样利用HCl和HNO3混酸于微波消解仪中进行溶解,电感耦合等离子体发射光谱(ICP-OES)法测定铜精矿中的银含量。试验了不同比例消解体系的消解效果,研究了不同浓度铁、铜基体的影响,结果表明王水体系消解效果最佳,1 000mg/L以下的铁、铜或铁、铜的混合基体对银的测定没有影响,10%HCl体系作为测定酸度。该方法对银的线性范围为0.73~1 500g/t,标准物质测定值与标准值无显著性差异。该方法前处理试剂消耗少、速度快,分析浓度范围宽,可用于铜精矿中银的快速测定。

Determination of Silver in Copper Concentrates by Microwave Digestion and Inductively Coupled Plasma-Optical Emission Spectrometry

Copper concentrates samples were digested by the mixed acid of hydrochloric acid and nitric acid with the assistance of microwave digestion,and silver in copper concentrates was determined by inductively coupled plasma atomic emission spectrometry.The digestion conditions were optimized,and the effect of iron/copper matrix was studied.The aqua regia was employed for the digestion of the copper concentrates.Iron,copper or the mixed matrix of iron with copper less than 1 000 mg/L has no effect on silver determination.The linear range of the method for silver determination was found to be 0.73-1 500 g/t.There is no significant difference between determination value and certified value for certified materials.The method has the advantage of low reagent consumption,fast analysis and wide linear range,and could be applied for silver determination in copper concentrates.