石墨炉原子吸收在线浓缩技术测定食用油中的痕量铅镉

采用微波消解处理样品,用石墨炉原子吸收在线浓缩程序对食用油中Pb,Cd进行测定,对干燥步骤重复进行4次,待测样实际被浓缩5次,完成后继续灰化、原子化和净化步骤,使待测样品中Pb、Cd含量富集增高,从而保证测定结果准确性。该方法用于食用油中Pb、Cd的测定,RSD≤6.0,回收率≥95%。

Online Concentration Technology Determination of Lead and Cdmium in Oils by Graphite Furnace Atomic Absorption Spectrometry

A new method using microwave digestion technique and concentration technique was developed for the determination of Pb and Cd in oils by graphite furnace atmotic absorption spectrometry (GFAAS). The drying steps repeated four times and sample was concentrated five times, then ashed, atomized and purified. Through this process the contents of Pb and Cd were increased, so as to ensure accuracy of determination results. The method was applied to the determination of Pb and Cd in oils with satisfactory results. The RSD were lower than 6.0. The recoveries were more than 95%.