Rietveld quantification of montmorillonites in lead-contaminated soils

被引：18

作者：

Dermatas, D ^{[1
]}

Dadachov, MS ^{[1
]}

机构：

[1] Stevens Inst Technol, Ctr Environm Engn, WM Keck Geoenvironm Lab, Hoboken, NJ 07030 USA

来源：

APPLIED CLAY SCIENCE | 2003年 / 23卷 / 1-4期

关键词：

montmorillonite; Rietveld method; contaminated soil; lead; calcium; X-ray diffraction;

D O I：

10.1016/S0169-1317(03)00109-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Differences between the observed and calculated X-ray diffraction (XRD) patterns when a Rietveld phase quantification of Pb-contaminated montmorillonite soil was attempted were found to be attributed to a misfit of the montmorillonite diffraction input data. This was due to the scattering properties of Pb combined with the ill-defined structure of montmorillonite. X-ray powder diffraction data of pure Pb-exchanged montmorillonites suggest a structural ordering of interlayer Pb. Based on structural modeling of Ca-, (Ca,Pb)- and Pb ion-exchanged montmorillonite forms, an "observed" powder file was developed, which may be used as input to Rietveld quantification of Pb-exchanged montmorillonites. (C) 2003 Elsevier BY. All rights reserved.

引用

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页码：245 / 255

页数：11

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