Rietveld quantification of montmorillonites in lead-contaminated soils
Source abstract
Abstract
Abstract 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: X-ray Diffraction in Crystallography · Clay minerals and soil interactions · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (39)
Show source-provided references
1. Bennet · 1986 · 161
2. Quantitative phase analysis using the Rietveld method10.1107/S0021889887009415 ↗
3. Quantitative mineralogical analysis using the Rietveld full-pattern fitting method
4. Quantitative analysis of mineral mixtures using linear programming10.1346/CCMN.1986.0340314 ↗
5. The effect of particle size and microabsorption on diffracted powder line intensities10.1080/14786444508520918 ↗
6. Brindley, G.W., 1961. Quantitative analysis of clay mixtures. In: Brown, G. (Ed.), X-ray Identification and Crystal Structures of Clay Minerals. Mineralogical Society London, Clay Minerals Group, pp. 489–514.
7. 1980 · 495
8. The structure of clay and its importance in foundation engineering
9. Computer-simulation of interlayer molecular structure in sodium montmorillonite hydrate10.1021/la00007a064 ↗
10. Correction of intensities for preferred orientation in powder diffractometry: application of the March model10.1107/S0021889886089458 ↗
11. Lattice structure of clay minerals and some properties of clays10.1086/625051 ↗
12. Kristallstruktur und Quellung von Montmorillonit (Das Tonmineral der Bentonittone)10.1524/zkri.1933.86.1.340 ↗
13. Molecular simulations of Zn-montmorillonite10.1180/000985598545552 ↗
14. Kraus · 1999
15. Larson · 1994
16. Layer lattices and base-exchange clays10.1524/zkri.1935.91.1.433 ↗
17. An algorithm for correction of intensity aberrations in Bragg–Brentano X-ray diffractometer data: its importance in the multiphase full-profile Rietveld quantitation of a montmorillonite clay
18. Intensity calibration curves for Bragg–Brentano diffractometers10.1017/S0885715600018297 ↗
19. A theoretical model for the correction of intensity aberrations in Bragg–Brentano X-ray diffractometers—detailed description of the algorithm10.1107/S0021889892010781 ↗
20. Mitchell · 1976
21. Studies of the dehydroxylated–rehydroxylated montmorillonite: structure of the layers and intercalation of water molecules
22. Hydraulic flow through saturated clay
23. The structure of interlayer water in Wyoming-montmorillonite studied by neutron diffraction with isotopic substitution
24. Quick clay microstructure10.1016/0013-7952(66)90019-6 ↗
25. A profile refinement method for nuclear and magnetic structures10.1107/S0021889869006558 ↗
26. Sposito · 1989
27. Computer programs for standardless quantitative analysis of minerals using the full powder diffraction profile10.1017/S0885715600016778 ↗
28. Absorption contrast effects in the quantitative XRD analysis of powders by full multiphase profile refinement10.1107/S002188989000841X ↗
29. A new method for rietveld clay analysis: Part I. Use of a universal measured standard profile for Rietveld quantification of montmorillonites10.1017/S0885715600014093 ↗
30. Simultaneous use of observed and calculated standard profiles in quantitative XRD analysis of minerals by the multiphase Rietveld method: the determination of pseudorutile in mineral sands products10.1017/S0885715600018510 ↗
31. Simultaneous use of observed and calculated standard patterns in quantitative XRD analysis of minerals by the multiphase Rietveld method: application to phase quantitation of mineral sands and portland cement
32. Terzaghi · 1948 · 566
33. A general recursion method for calculating diffracted intensities from crystal containing planar faults10.1098/rspa.1991.0062 ↗
34. The distribution of octahedral cations in the 2:1 layers of dioctahedral smectites studied by oblique-texture electron diffraction10.1180/claymin.1984.019.2.05 ↗
35. The nature of disorder in montmorillonite by simulation of X-ray powder patterns10.2138/am-2002-0720 ↗
36. Quantitative mineralogy of sandstones by X-ray diffractometry and normative analysis10.2110/jsr.69.1050 ↗
37. Fabric unit interaction and soil behavior
38. Yong · 1966
39. Electron diffraction study of the montmorillonite structure