玻璃标样结合硫内标归一定量技术在激光剥蚀-等离子体质谱分析硫化物矿物中的应用

以硬石膏矿物标样中Ca相对于S的灵敏度因子为基准,将玻璃标样中主量和痕量元素相对于Ca的灵敏度因子转换成元素相对于S的灵敏度因子,建立了多玻璃标样结合硫内标归一定量技术分析硫化物单矿物多元素的新方法。利用本方法分析了美国合成多金属硫化物矿物标样MASS-1中20种元素,主量元素分析结果的相对误差小于10%,痕量元素分析结果几乎都落在给定值±不确定度范围内。利用本方法对12个硫化物单矿物分析结果表明,绝大多数主量元素含量测定值的相对误差小于10%,且多数主量元素甚至优于以MASS-1为外标、内标归一定量法及内标校准法分析结果,而痕量元素与MASS-1校准结果较为一致。本方法克服了基体不匹配的问题,能比较准确地定量分析硫化物矿物中的主成分S,可用于定量校准硫化物矿物。

Quantitative Analysis of Sulfide Minerals by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Using Glass Reference Materials with Matrix Normalization Plus Sulfur Internal Standardization Calibration

A novel strategy for microanalysis of sulfides by laser ablation(LA)-ICP-MS was established.In this method,the relative sensitivity factor of Ca relative to S in anhydrite mineral reference material was taken as a transition bridge,by which the relative sensitivity factors of interesting elements in glass reference materials relative to Ca could be converted into relative sensitivity factors relative to S by the transition bridge,then the quantitative analysis of multi-elements in sulfide minerals by multi-glass reference materials with matrix normalization plus sulfur internal standardization calibration was carried out.20 elements in the American polymetal sulfide mineral reference material MASS-1 were analyzed using this new method.The relative errors of major elements in MASS-1 were less than 10%,and the results of trace elements with reference values were nearly within the uncertainty of the preliminary values.Multi-elements in 12 sulfide single minerals were analyzed by applying this new method.The relative errors of the greatest number of major elements were less than 10%,with which the results of most major elements were accurate than those obtained by MASS-1 as calibration standard with matrix normalization plus internal standardization or internal standard calibration.And the results to trace elements agreed well with the calibrated results by MASS-1 with matrix normalization plus internal standardization or internal standard calibration.This method overcomes the problem of non-matrix matched standards,enables to accurately determine the major composition of sulfur in sulfide minerals and suggests a new approach for analysis of sulfide minerals.