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Impact of Soil Water on the Spectral Characteristics and Accuracy of Energy-Dispersive X-ray Fluorescence Measurement
Gu, Runyao1,2; Lei, Mei1,2; Chen, Tongbin1,2; Wan, Xiaoming1,2; Dong, Ziping1,2; Wang, Yuntao1,2; Qiao, Pengwei3
2019-05-07
Source PublicationANALYTICAL CHEMISTRY
ISSN0003-2700
Volume91Issue:9Pages:5858-5865
Corresponding AuthorLei, Mei(leim@igsnrr.ac.cn)
AbstractSoil water is a major interference in the on-site analysis of soil by energy-dispersive X-ray fluorescence. Apparent consequences of this interference include lowered readings for elemental concentrations and significant changes in spectral characteristics in wet soils compared with dry soils. A rigorous interpretation on this issue remains unresolved. Thus, this study evaluated the impact of soil water on the detection of Ca, Ti, Mn, Fe, Cu, Zn, As, Rb, Sr, and Pb. Specimens were prepared from 11 certified reference soils and 3 field soils with water contents from 0 to similar to 40 wt %. Results from three commercial models revealed that the readings were subjected to respective internal quantification algorithms; therefore, they could not provide a fundamental perspective of this issue. We analyzed the spectra to examine the mechanism underlying this phenomenon. The spectra of wet soils feature elevated baseline, increased Compton and Rayleigh scatter peaks, and lowered characteristic peaks of elements. Previous studies attributed the lowered characteristic peaks to the absorption of fluorescent X-rays by water and considered soil water and dry soil as separate layers in the calculation. This work argues that wet soils should be treated as mixtures. Water becomes part of the soil matrix and leads to lower attenuation capability, which could be explained by the matrix effect. Meanwhile, the mass fraction of analytes is lowered because of dilution. Results confirmed that dilution lowers the characteristic peaks, whereas the matrix effect heightens them. When estimating the elemental concentrations on a wet weight basis, the matrix effect becomes the major interference. The Compton compensation method provided satisfying results on correcting the matrix effect caused by soil water on Zn, As, Rb, Sr, and Pb.
DOI10.1021/acs.analchern.9b00201
WOS KeywordHEAVY-METAL POLLUTION ; FIELD PORTABLE XRF ; TRACE-ELEMENT ANALYSIS ; MATRIX CORRECTIONS ; MOISTURE ; SEDIMENTS ; SPECTROMETRY ; CALIBRATION
Indexed BySCI
Language英语
Funding Project863 State High Tech Development Plan of P.R.C.[2014AA06A513]
Funding Organization863 State High Tech Development Plan of P.R.C.
WOS Research AreaChemistry
WOS SubjectChemistry, Analytical
WOS IDWOS:000467642100055
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/59834
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLei, Mei
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Environm Protect Res Inst Light Ind, Beijing Key Lab Remediat Ind Pollut Sites, Beijing 100089, Peoples R China
Recommended Citation
GB/T 7714
Gu, Runyao,Lei, Mei,Chen, Tongbin,et al. Impact of Soil Water on the Spectral Characteristics and Accuracy of Energy-Dispersive X-ray Fluorescence Measurement[J]. ANALYTICAL CHEMISTRY,2019,91(9):5858-5865.
APA Gu, Runyao.,Lei, Mei.,Chen, Tongbin.,Wan, Xiaoming.,Dong, Ziping.,...&Qiao, Pengwei.(2019).Impact of Soil Water on the Spectral Characteristics and Accuracy of Energy-Dispersive X-ray Fluorescence Measurement.ANALYTICAL CHEMISTRY,91(9),5858-5865.
MLA Gu, Runyao,et al."Impact of Soil Water on the Spectral Characteristics and Accuracy of Energy-Dispersive X-ray Fluorescence Measurement".ANALYTICAL CHEMISTRY 91.9(2019):5858-5865.
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