Identification of Saltwater Cultured Pearls and Freshwater Cultured Pearls by Using X-ray Fluorescence Spectroscopic Technique
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摘要: 采用X荧光能谱技术研究珍珠中微量元素的种类及其质量分数,以达到无损鉴别淡水珍珠和海水珍珠的目的。利用X射线荧光能谱仪优选适合的激发工作条件,通过设定相同的工作条件,获得珍珠主量元素和微量元素的能量色散图谱,定性分析其主量元素和微量元素的组合关系。其中,Mn的特征峰与Sr/Ca计数比率对鉴别珍珠品种有重要的指示意义。研究表明,在电压为30~35kV、电流为0.50~0.80mA、滤光片PdThick的测试条件下,淡水珍珠一般具有Ca+Sr+Mn的组合关系,海水珍珠具有Ca+Sr的组合关系;淡水珍珠中的Sr/Ca介于0.14~0.37,海水珍珠中的Sr/Ca介于0.46~0.71。综合利用元素的组合关系和Sr/Ca计数比率,可快捷、无损地鉴别珍珠品种。Abstract: X-ray fluorescence spectroscopic technique(XRF) is used for studying the varieties and contents of trace elements of pearls in order to distingush the freshwater cultured pearls from saltwater cultured pearls.The optimizing working conditions of XRF for detecting the main and trace elements of pearls are also studied. The characteristic peaks of Mn and the values of Sr/Ca could be qualitatively analysed for distinguishing the varieties of pearls. With the working conditions of voltage being 30~35 kV,current being 0.50~0.80 mA and Pd Thick filter,element combination is Ca+Sr+Mn and the ratio of Sr/Ca is in a range from 0.14 to 0.37 for the freshwater cultured pearls; the element combination is mainly Ca and Sr,and the ratio of Sr/Ca is in a range from 0.46 to 0.71 for saltwater cultured pearls.Combined with element constituents and the ratio of Sr/Ca,saltwater cultured pearls could be nondestructively and quickly identified from the freshwater cultured pearls.
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