摘要
采用电感耦合等离子体质谱法(ICP-MS)测定地质样品中的痕量Au和Ag时会受到Zr,Nb,Ta,Hf元素的氧化物和氢氧化物的干扰,本研究利用碰撞反应池(DRC)技术,采用O_2作为反应气,将干扰物氧化成多氧化物和/或多氧氢化物以消除干扰,同时通入CH_4修饰Ar等离子体,提高Au和Ag的灵敏度,建立了ICP-MS同时测定地质样品中Au和Ag的方法。在反应气O_2流速为2.2 mL/min时,Ag在m/z 109处的干扰可以降低250多倍,Au在m/z 197处的干扰可以降低500多倍。修饰气CH_4流速为3 mL/min时,Au和Ag的灵敏度分别可以提高3倍和1.5倍。在优化的条件下,Au和Ag的定量限分别为0.01 ng/g和0.007 ng/g。该方法采用岩石标准参考物质进行了验证,结果令人满意。
Au and Ag are subjected to significant spectral interferences caused by high concentrations of Zr, Nb, Ta and Hf in inductively coupled mass spectrometry (ICP-MS) analysis for geological plasma at 3 mL/min, and the sensitivities of Au and Ag were increased by a factor of 3 and 1.5. Under the optimized experimental conditions, the limit of quantitation for Au and Ag were 0. 01 and 0. 007 ng/g, respectively. The proposed method was applied to the direct determination of Au and Ag in geological standard reference materials, and the results were found to agree well with the certified values.
作者
王家恒
刘冬云
WANG Jia-heng LIU Dong-yun(China Gezhouba Group Servey & Design Institute Co. Ltd, Yichang 44300)
出处
《分析试验室》
CAS
CSCD
北大核心
2017年第7期819-822,共4页
Chinese Journal of Analysis Laboratory
关键词
电感耦合等离子体质谱法
地质样品
金
银
动态反应池
Inductively coupled plasma mass spectrometry
Geological samples
Golden
Silver
Dynamic reaction cell