摘要
Ag同位素比值主要应用于早期太阳系定年和含Ag物质的示踪,目前Ag同位素比值测定方法十分有限,已有方法的测定过程较为繁琐.因此建立了以Pd为内标、Ag同位素标准品SRM 978a为标样,结合标准-样品交叉(SSB)技术校正质量歧视,用多接收器电感耦合等离子体质谱仪(multicollector-inductively coupled plasma mass spectrometry,MC-ICPMS)快速准确测定Ag同位素比值的方法.该方法在Pd含量为2.0 mg/kg,样品与标准溶液的Ag含量比值匹配范围为0.25~5.0,且待测样品中Ag含量不低于5μg/kg时方能得到精确的比值;含复杂基体的环境样品则需用AG1X8强碱性阴离子交换树脂柱多次分离.用该方法对人工和环境样品中Ag同位素比值的测定结果表明不同来源的Ag存在同位素分馏,因此Ag同位素比值可用于含Ag物质的示踪.
The isotopic ratio of silver(Ag)is mainly used in dating the early solar system and tracking Ag-containing substances.However,current determination methods of Ag isotopic ratio,are very limited and the existing methods are quite complicated.In this study a method with standard-sample bracketing,internal palldium(Pd)normalization,and SRM 978a Ag as the isotopic standard combined to correct the mass bias occurring in the determination of Ag isotopic ratio,was established using multicollector-inductively coupled plasma mass spectrometry(MC-ICPMS).The content of Pd was 2.0 mg/kg.The Ag content in samples had to match the standard solution within 0.255.0 folds and had to be≥5μg/kg.Ag in samples with complex matrix was purified with several AG1X8 strong alkaline anion exchange resin columns.The method was successfully applied to the determination of Ag isotopic ratio in engineered and environmental samples.The isotopic fractionation of Ag from different sources showed that Ag isotopic ratio can be used in tracing Ag-containing substances.
作者
朱祖浩
郑爱榕
杨璐
ZHU Zuhao;ZHENG Airong;YANG Lu(Coastal Blue Carbon Laboratory,Fourth Institute of Oceanography,Ministry of Natural Resources,Beihai 536000,China;College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China;Institute of Measurement Science and Standards,National Research Council Canada,Ottawa K1A0R6,Canada)
出处
《厦门大学学报(自然科学版)》
CAS
CSCD
北大核心
2020年第2期263-270,共8页
Journal of Xiamen University:Natural Science
基金
广西自然科学基金(2019GXNSFBA185036)
广西科技基地和人才专项(2018AD19280)
北海市科技计划项目(201995037)
自然资源部第四海洋研究所博士科研启动项目(201804)
国家海洋局海洋公益性项目(20150534)。
关键词
Ag同位素比值
多接收器电感耦合等离子体质谱仪
质量歧视校正
环境样品
silver isotopic ratio
multicollector-inductively coupled plasma mass spectrometry(MC-ICPMS)
mass bias correction
environmental sample