目的：建立微波消解－石墨炉原子吸收光谱法测定土壤中铅和镉含量的方法。方法利用硝酸－盐酸－氢氟酸作消解液，土壤样品经微波消解，采用石墨炉原子吸收光谱法测定土壤中铅和镉的含量。结果在优化实验条件下，铅（2．0～50μg／L）、镉（0．1～1．0μg／L）的吸光度（A）与浓度（C）呈良好的线性关系（r值分别为0．9962，0．9971，），检出限分别为1．48μg／L和0．062μg／L ，回收率为92．40％～102．6％，RSD为2畅63％～5畅62％。结论该方法样品处理效率高、准确性好，用于土壤中铅和镉的测定，结果令人满意。%Ob j ective To establish a method for the determination of lead and cadmium in soil using microwave digestion by atomic absorption spectrometry (AAS) .Methods Using nitric acid‐hydrochloric acid‐hydrofluoric acid as remove fluid ,soil samples were digested by microwave ,then the contents of lead and cadmium in soil were detected by atomic absorption spectrometry (AAS) .Results There was a good linear relationship at the concen‐tration of 2 .0~50μg/L for Pb and at 0 .1 ~1 .0μg/L for Cd;the correlation coefficient of Pb was 0 .9962 and that of Cd was 0 .9971 .The detection limits of lead and cadmium were 1 .48μg/L和0 .062μg/L ,respectively ,and the recovery rates were 92 .40% ~102 .6% ,the RSDs were 2 .63% ~5 .62% .Conclusion The method was efficient for sample reatment and accurate .The method was employed for measurement of Pb and Cd in soil ,and satisfacto‐ry results were obtained .
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