原子荧光光谱法测定皮革中9种重金属元素的含量

AFS Determination of 9 Heavy Metal Elements in Leather

皮革样品经硝酸-高氯酸(4+1)混合酸湿法消解后,用氢化物发生-原子荧光光谱法测定其中砷、锑、汞、铅和镉的含量;样品经干法灰化后,用火焰原子荧光光谱法测定其中铬、钴、铜和镍的含量。对各元素的稀释介质、还原剂和仪器工作条件作了详细的叙述。9种元素的质量浓度与吸光度分别在一定的范围内呈线性关系;砷、锑、铅、钴和镍的检出限(3S/N)为0.5 mg·kg^(-1),汞、镉和铜的检出限(3S/N)为0.05 mg·kg^(-1),铬的检出限(3S/N)为5.0 mg·kg^(-1)。应用此法分析了皮革样品,以标准加入法做回收试验,回收率在89.2%～106%之间。

Sample of leather was digested with a mixed acid of HNOa and HC104 （4＋1）, and the contents of As, Sb, Hg, Pb and Cd in sample solution were determined by HG-AFS; and sample was treated by ashing, and the contents of Cr, Co, Cu and Ni were determined by FAFS. The dilution mediums, reductive and working conditions of instrument were described in detail. Linear relationships between values of absorbance and mass concentration of the 9 elements found were in definite ranges. Values of detection limit （3S/N） found were 0. Smg. kg^-1 for As, Sb, Pb, Co and Ni; 0.05 mg. kg^-1 for Hg, Cd and Cu; 5. 0 mg· kg^-1 for Cr. The proposed method was applied to the analysis of sample of leather, and values of recovery found by standard addition method were in the range of 89. 2%--106%.