银饰品及合金中银含量标准检测方法讨论

Discussion on the Standard Test Method of Silver Content in Silver Jewelry and Alloy

对银饰品及合金中银含量的6大类的11种国家标准测定方法进行汇总,讨论了X射线荧光光谱法、电位滴定法、容量法、火试金重量法、比浊法和火焰原子吸收光谱法的测定原理、方法特点、测定过程注意事项和可能出现的问题。基于讨论结果,采用实际样品测试,通过固定氯化钠浓度、调整称样量的方式优化了比浊法,同时通过实验研究了标银纯度、吸光值灵敏度大小对火焰原子吸收法的影响。

This paper summarized 11 kinds of national standard determination methods of silver content in6 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.