岩矿测试2025，Vol.44Issue(3)：447-459,13.DOI:10.15898/j.ykcs.202412250277
铁钙和有机质基体效应对能量色散X射线荧光光谱法测定土壤中镉含量的影响
Effects of Iron-Calcium and Organic Matter Matrix on Cadmium Detection in Soil by Energy Dispersive X-Ray Fluorescence Spectroscopy
摘要
Abstract
Cadmium(Cd)is a toxic and harmful heavy metal,and energy dispersive X-ray fluorescence spectroscopy(EDXRF)technology is widely used to detect Cd content in contaminated soil.However,matrix components such as coexisting elements and organic matter in soil may interfere with Cd detection results through X-ray absorption enhancement,spectral line overlap or scattering effect,and the influence of different soil components on the detection results has not been fully studied,which poses a challenge to the detection precision and accuracy of the instrument.Different concentrations of iron(Fe),calcium(Ca)and humic acid were added to diatomite as the matrix to evaluate the interference of these components on the Cd fluorescence signal,and the effects of overlapping interference deduction and correction methods on the Cd fluorescence intensity under different element content conditions were discussed.The results showed that the presence of Fe and Ca in the soil matrix(＞5％)could lead to the underestimation of the EDXRF measurement of Cd through the inter-element absorption effect,while the presence of humic acid(＞10％)could raise the low-energy scattering background in the spectral pattern and increase the determination error of low-concentration Cd.Based on the orthogonal experimental design,Fe,Ca and humic acid were introduced as correction factors,and a multiple linear regression correction model was established,which significantly improved the accuracy of EDXRF in determining Cd content in soil samples.The average relative error between the measured value of Cd content and the standard value decreased from 20.67％ without correction to 7.64％ after correction.This study demonstrates that the application potential of EDXRF technology in different types of soil through reasonable correction measures can be significantly improved,and an efficient,convenient and accurate detection method for environmental monitoring can be established.关键词
镉/能量色散X射线荧光光谱法/共存元素/有机质/基体效应/校正模型Key words
cadmium/energy dispersive X-ray fluorescence spectrometry/coexisting elements/organic matter/matrix effects/correction model分类
资源环境引用本文复制引用
蒋奡松,吴龙华,周通,李柱,王晶晶,黄玉娟..铁钙和有机质基体效应对能量色散X射线荧光光谱法测定土壤中镉含量的影响[J].岩矿测试,2025,44(3):447-459,13.基金项目
国家重点研发计划项目(2022YFC3700805) （2022YFC3700805）
