微波消解-火焰原子吸收光谱法测定土壤中的铅、镍、铜

Determination of lead,nickel and copper in soil by flame atomic absorption spectrometry

应用微波消解和火焰原子吸收光谱法测定土壤中的铅、镍、铜。考察了土壤的最佳微波消解条件,样品用HNO3-HClO4-HF混合酸经微波消解后,溶解时间由原来的3～5h缩短到3min。以原子吸收光谱法测定土壤中铅、镍、铜。铅、镍、铜的测定波长分别为283.3、232.0、324.8nm;检出限分别为0.000 5、0.000 4、0.000 1μg/mL;工作曲线的线性范围为0.002～30.00μg/mL,0.001～50.00μg/mL,0.001～6.00μg/mL。方法用于土壤样品的分析,铅、镍、铜的相对标准偏差分别小于0.31%、1.52%、3.29%,回收率在98.00%～102.00%。

Soil Samples were digested in an inclosed microwave system, then flame absorption spec-trometry was applied to determination of lead, nickel and copper in soil samples. Selected the best soil conditions of microwave digestion, after digestion with HNO3-HC104-HF mixed acid by microwave,dissolution time from 345 h reduced to 3 min. The wavelengths of determining lead, nickel and copper were 283.3,232.0,324. 8 nm;respectively. The detection limits were 0. 000 5,0. 000 4 and 0. 000 1μg/mL. respectively,and the linear ranges were 0. 002～30.00μg/mL,0. 001～50. 00 μg/mL,0. 001～6.00 μg/mL,respectively. The method has been applied for the determination of lead, nickel and copperwith the relative standard deviation less than 0.31%, 1.52%, 3.29% respectively, and the e recovery of 98.00%～102.00%.