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Volume 12 Issue 2
Jun.  2010
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LI Su-qing. Evaluation of Measurement Uncertainty in Determination of Silver by Volhard Method[J]. Journal of Gems & Gemmology, 2010, 12(2): 21-25.
Citation: LI Su-qing. Evaluation of Measurement Uncertainty in Determination of Silver by Volhard Method[J]. Journal of Gems & Gemmology, 2010, 12(2): 21-25.
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Evaluation of Measurement Uncertainty in Determination of Silver by Volhard Method

  • National Jewellery Quality Supervision and Inspection Center, Beijing 100101, China

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  • Received Date: March 24, 2010
  • Revised Date: May 09, 2010
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    • Abstract
  • The measurement uncertainties of silver content in silver jewelry are evaluated by Volhard method in this paper.Taking a piece of 925-silver jewelry for example,the resources of the measurement uncertainties are analysed,which affect the measurement uncertainties of silver content by Volhard method,and each quantity of the measurement uncertainties is quantized.In the evaluation process,the expanded uncertainties are gotton with the Excel program.The result is expressed as followed:wAg=(92.55±0.24)%,k=2.It provides the credible theoretical basis for the quality controlling of silver jewelry by Volhard method.
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    • References (4)
  • [1]
    JJF1059-1999,测量不确定度评定与表示[S].
    [2]
    GB/T11886-2001,首饰含银量化学分析方法[S].
    [3]
    J Kragten.Calculating standard deviations and confidencein-tervals with a universally applicable spreadsheet technique[J].Analyst,1994,(119):2161—2166.
    [4]
    中国实验室国家认可委员会.化学分析中不确定度的评估指南[M].北京:中国计量出版社,2002.
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