黄金基体多元素混合标准溶液的配制及其不确定度评定

传统电感耦合等离子体发射光谱法测定高纯金过程中需配制单一杂质元素的标准溶液,步骤繁琐,且存在基体干扰。研究建立了黄金基体多元素混合标准溶液的配制方法,并对配制过程产生的不确定度进行评定。将高纯金可能存在的18种杂质元素分为A系列和B系列,配制的黄金基体多元素混合系列标准溶液最高质量浓度为10.0 mg/L,最低质量浓度为1.00 mg/L,其特性值的扩展不确定度小于0.5%(k=2)。该混合标准溶液消除了电感耦合等离子体发射光谱法测定过程中的基体干扰,保证了测定结果的准确度。

Preparation of gold matrix multi-element standard solution and its uncertainty evaluation

Conventional ICP process for the determination of high purity gold needs the preparation of a single -el-ement standard solution ,which makes the process complex and is interfered by matrix .The research developed a prep-aration method for gold matrix multi-element standard solution and evaluated uncertainty of the process .18 impurity el-ement possibly in high purity gold are classified into A series and B series .The maximum mass concentration of the gold matrix multi-element standard solution prepared is 10.0 mg/L and the minimum of it is 1.00 mg/L.The relative expanded uncertainty of the feature is less than 0.5 %(k=2).This mixed standard solution eliminates the matrix in-terference to the determination of ICP process .The accuracy of the determination results is guaranteed .