基于能量色散XRF光谱的土壤重金属As与Pb同时定量分析方法  

Simultaneous Quantitative Analysis of Soil Heavy Metals As and Pb Based on Energy Dispersive XRF Spectroscopy

作　　者：叶紫琪 甘婷婷 吴文涛[1] 赵南京[2,3,4,5] 殷高方 方丽 岳正波[1] 王进 盛若愚[2,3,4] 汪颖[2,3,4] 李唐虎 YE Zi-qi;GAN Ting-ting;WU Wen-tao;ZHAO Nan-jing;YIN Gao-fang;FANG Li;YUE Zheng-bo;WANG Jin;SHENG Ruo-yu;WANG Ying;LI Tang-hu(School of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Optical Monitoring Technology for Environmental of Anhui Province,Hefei 230031,China;Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院环境光学与技术重点实验室,安徽合肥230031 [3]中国科学技术大学,安徽合肥230026 [4]环境光学监测技术安徽省重点实验室,安徽合肥230031 [5]安徽大学物质科学与信息技术研究院,安徽合肥230601

出　　处：《光谱学与光谱分析》2024年第9期2494-2500,共7页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划项目(2022YFC3700804);国家自然科学基金项目(61805254)资助。

摘　　要：针对能量色散XRF光谱难以实现土壤重金属Pb与As的同时准确定量检测问题,基于Pb元素Lα、Lβ及As元素Kα、Kβ的谱峰特性,提出了一种能量色散XRF光谱土壤重金属As与Pb同时定量分析方法。该方法通过构建不同浓度Pb元素Lα与Lβ特征峰强度关系,根据实测样品Pb元素Lα与As元素Kα重叠峰强度信息,准确解析Pb元素Lα及As元素Kα特征峰强度,基于已建立的定量分析曲线实现土壤样品中Pb与As的准确反演。通过对不同浓度Pb与As共存土壤样品定量检测,相比ICP-MS测量结果,本文方法对20.25~844.84mg·kg-1重金属Pb检测的相对误差在0.86%~11.09%之间,平均相对误差为6.17%;对26.99~825.93mg·kg-1重金属As检测的相对误差在0.10%~14.72%之间,平均相对误差为8.11%,实现了Pb与As共存土壤中Pb与As含量的同时准确定量分析,为发展土壤重金属现场快速XRF精准检测设备提供了方法。This paper proposes a simultaneous quantitative analysis method for Pb and As in soil based on the spectral peak characteristics of Lαand Lβof the Pb element and Kαand Kβof the As element,aiming at the difficulty of accurately quantifying Pb and As in soil simultaneously by energy-dispersive XRF spectrometry.The method constructs the relationship between the characteristic peak intensities of Lαand Lβof Pb element at different concentrations,accurately analyzes the characteristic peak intensities of Lαof Pb element and Kαof As element according to the overlapping peak intensity information of Lαof Pb element and Kαof As element in the measured sample,and realizes the accurate back calculation of Pb and As in the soil sample based on the established quantitative analysis curve.Through quantitative detection of Pb and As coexisting soil samples with different concentrations,compared with the results measured by ICP-MS,the relative error of this method for detecting 20.25~844.84 mg·kg^(-1)heavy metal Pb is between 0.86%and 11.09%,with an average relative error of 6.17%;the relative error for detecting 26.99~825.93mg·kg^(-1)heavy metal As is between 0.10%and 14.72%,with an average relative error of 8.11%.This method achieves the simultaneous accurate quantitative analysis of Pb and As contents in soil coexisting with Pb and As,and provides a method for developing rapid XRF precision detection equipment for soil heavy metals on site.

关 键 词：X射线荧光 铅 砷 重叠峰解析 同时定量检测 

分 类 号：O657.34[理学—分析化学]