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.
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页码：245 / 255
页数：11
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