| This paper summarized 11 kinds of national standard determination methods of silver content in 6 categories of silver jewelry and alloy, discusses the determination principle, method characteristics, matters needing attention and possible problems of X-ray fluorescence spectrometry, potentiometric titration, volumetric method, fire assay weight method, turbidimetric method and flame atomic absorption spectrometry. Based on the results of the discussion, the turbidimetric method was optimized by fixing the concentration of sodium chloride and adjusting the sample weight. At the same time, the influence of the purity of standard silver and the sensitivity of absorption value on FAAS was studied. |
