微波消解-石墨炉原子吸收光谱法测定土壤样品中镉的含量  

Determination of Cadmium in Soil Samples by Microwave Digestion Graphite Furnace Atomic Absorption Spectroscopy

作　　者：李伟明[1] LI Wei-ming(Geological Team of Anhui Provincial Bureau of Geology and Mineral Exploration,Huangshan 245000,China)

机构地区：[1]安徽省地质矿产勘查局332地质队,安徽黄山245000

出　　处：《安徽化工》2024年第1期140-143,共4页Anhui Chemical Industry

摘　　要：建立了微波消解-石墨炉原子吸收光谱法测定土壤样品中的镉元素含量的方法。采用微波消解和HNO3-HF-H2O2酸系消解样品的前处理方法效果相对较好,消解速度快,能很好地处理土壤中有机质。通过正交实验优化了升温程序,灰化温度选择680℃,原子化温度选择1 600℃,同时通过对基体改进剂的比选,选择0.50μg/mL氯化钯溶液作为基体改进剂时效果相对较好。该方法镉的检出限为0.018 ng/mL,测定下限为0.072 ng/mL,方法精密度(RSD值)为0.9%~2.4%,加标回收率为97.0%~102.7%,符合岩石矿物分析规范的要求。微波消解-石墨炉原子吸收光谱法测定土壤中镉含量的方法具有操作简便、检出限低、干扰少、精密度高、准确度好的特点。A method for the determination of cadmium in soil samples by graphite furnace atomic absorption spectrosco-py was established.The pre-treatment methods of microwave digestion and HNO3-HF-H2O2 acid digestion have relative-ly good results,fast digestion speed,and can effectively treat organic matter in soil.This article optimized the heating program through orthogonal experiments.The ashing temperature was selected as 680℃,and the atomization tempera-ture was selected as 1600℃.At the same time,through the comparison of matrix modifiers,0.50μg/mL palladium chloride solution was selected as the matrix modifier,which showed relatively good results.The detection limit of cadmi-um in this method is 0.018 ng/mL,the lower limit of determination is 0.072 ng/mL,the precision(RSD value)of the method is in the range of 0.9%to 2.4%,and the spiked recovery rate is in the range of 97.0%to 102.7%,which meets the requirements of rock and mineral analysis specifications.The method of microwave digestion graphite furnace atomic absorption spectroscopy for the determination of cadmium in soil is characterized by simple operation,low detection lim-it,less interference,high precision and good accuracy.

关 键 词：镉 石墨炉 微波消解 土壤 

分 类 号：O657.31[理学—分析化学]