Closed Microwave Digestion- Inductively Coupled Plasma Mass Spectrometry with Standard Addition for Determination of Gold and Silver in Ore
Received:October 26, 2011  Revised:December 31, 2011
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DOI:10.3969/j.issn.2095-1035.2012.01.0011
KeyWord:microwave digestion; ICP-MS; ore; Au; Ag; standard addition
           
AuthorInstitution
CHENG Yong 攀钢集团研究院有限公司,成都 
YUANG Jinhong 攀钢集团研究院有限公司,成都 
XIAO Jun 攀钢集团研究院有限公司,成都 
HU Jinrong 攀钢集团研究院有限公司,成都 
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Abstract:
      A new method for simultaneous and direct determination of trace Ag and Au in ore by inductively coupled plasma mass spectrometry (ICP-MS) with closed microwave digestion has been established. The operating conditions of microwave sample digestion, matrix effect and mass interference have been investigated. The operating parameters of the ICP ionization source and mass spectrometer and microwave digestion conditions were optimized. Standard addition method was used in order to eliminate the matrix effects on signals during the analysis of complex and varied ores. Interference correction equations were applied to data treatment to eliminate mass overlapping effects caused by polyatomic ion. The results show that: the recovery of 197Au ,107Ag and 109Ag are in the range of 106% ~ 113%, 95% ~ 105%, 93% ~ 103%, respectively, with the relative standard deviation ( RSD) of <6% (n = 8). The detection limits of 197Au ,107Ag, 109Ag are 10,3 and 6 ng/g, respectively. The method has good applicability and is suitable to determine ultra-trace gold and silver in the different types of ores. In summary, the advantages of the method include simple analytical procedure, easy instrument operation, short time for obtaining accurate results.
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