《白色金合金标准样品》的研制

由于目前国内白色K金样品成分复杂、配方更新较快、缺乏可用于生产控制和检测工作使用的白色金合金标准样品，特别是含钯配方的标准样品。采用特殊的熔炼铸造工艺研制了主要成分为金、银、铜、锌、镍、钯、铟和铁等8种元素，金的质量分数范围为80%~37.5%的白色金合金标准样品。利用能量色散型X射线荧光光谱仪(XRF)、波长色散型XRF、电感藕合等离子体发射光谱仪(ICP-AES)和电位滴定仪等仪器设备对标准样品进行均匀性检验、稳定性测试、化学定值等，结果表明标准样品的均匀性和稳定性良好，定值准确，工作曲线线性良好。因此，该标准样品作为国家标准样品，可应用于白色金合金饰品的分析方法的确认及检测过程中的质量控制。

LAN Yan1, CHEN Shichang2, WANG Xiaoqing1*, LIU Luoyuan3, ZHANG Xiaohu1, GUAN Fuzheng3, ZOU Zhenyu4, CHEN Wenjuan4, LUO Zhigao4, LI Xunhe1

Due to the complex composition and fast formula update of white gold alloy samples in China, there was shortage of Certified Reference Material (CRMs) for white gold alloy, especially the ones containing palladium to be used in production control and testing. Therefore, the CRMs for white gold alloy with the major ingredient of Au, Ag, Cu, Zn, Ni, Pd, In, Fe and Au mass fraction of 80%~37.5% were developed by the project team. The homogeneity, stability and certification of standard samples were tested by XRF spectrometry, ICP-AES, muffle and potentiometric titration. The results confirm that the homogeneity, stability and linearity of working curve of the standard samples are satisfactory, and the certification is accurate. Therefore, the standard samples as the national standard samples can be applied to the detection of white gold alloy jewelry, the validation of analytical methods and quality control in the production process.