采用微波消解法处理样品,用硝酸-双氧水(体积比6∶1)混合溶液作为消解剂进行微波消解,火焰原子吸收光谱法测定了市售3种珍珠粉中锌、钠、镁、铁、钙、铜、锰、锶等8种金属元素含量。8种元素检出限(3S/N)在0.000 6～0.024 8 mg/L,回收率95%～105%,相对标准偏差(n=10)<5%。试验结果表明:3种珍珠粉样品中8种金属含量的数值变化趋势较为一致,其中钙含量最高,含量均达34.15%以上,锰、锶、铁、钠的含量也较为丰富,均在94.74μg/g以上,而锌、镁、铜含量相对较少,均少于11.78μg/g。从珍珠粉的主要成分金属元素钙的含量测定结果可以推断出3种珍珠粉的品质有所差别,钙含量低的质量相对差。

Flame atomic absorption spectrometry(FAAS) was applied to determinate eight metal elements,Zn,Na,Mg,Fe,Ca,Cu,Mn,Sr,in three kinds of pearl powder bought from market.The samples were digested with a mixture of HNO3 and H2O2(6∶ 1,φ) in a microwave and then detected by FAAS.Detection limits(3S/N) for eight elements were in the range of 0.000 6~0.024 8 mg/L.The recoveries were in the range of 95%~105% and RSD(n=10) was lower than 5%.The distribution of 8 metal elements in 3 kinds of pearl powder were similar.Ca was the most which was more than 34.15%.Mn,Sr,Fe,Na were more than 94.74 μg/g while Zn,Mg,Cu were less than 11.78 μg/g.The content of Ca indicated the quality difference among 3 kinds of pearl powder.The lower the content of Ca was,the worse the pearl powder's quality was.This paper provides a new and useful method for quality assessment of pearl powder by the contents of metal elements.