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Simultaneous Mineralogical Quantification and Chemical Characterization of Soil Clays

Published online by Cambridge University Press:  28 February 2024

D. A. Laird  and
R. H. Dowdy
D. A. Laird
Affiliation:
USDA-Agricultural Research Service-National Soil Tilth Laboratory, 2150 Pammel Drive, Ames, Iowa 50011
R. H. Dowdy
Affiliation:
USDA-Agricultural Research Service-Soil and Water Management Research Unit, 1991 Upper Buford Circle, St. Paul, Minnesota 55108
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Abstract

A new chemical mass balance technique has been developed for simultaneous mineralogical quantification and chemical characterization of soil clays. The procedure includes separation of the whole clay (<2 μm fraction) into six particle size fractions (<0.02, <0.06, <0.2, 0.02–0.06, 0.06–0.2, and 0.2–2 μm fractions), chemical analysis of the whole clay and each of the six fractions, and fitting of a nonlinear chemical mass balance model to the chemical analyses. As written, the chemical mass balance model is valid only for samples containing mixtures of quartz, kaolinite, illite, and mixed-layered smectiteillite. Samples containing carbonates and free iron compounds may be analyzed using the technique if these phases are chemically removed prior to particle size fractionation. Accuracy of the new technique was tested using synthetic data and found to depend on the quality of the input data; however, clay phase quantification within three percentage points of known values was readily achieved. Precision of the technique was evaluated by independently preparing and analyzing five samples of the same soil clay. Standard deviations for clay phase percentages (w:w) in the <2 μm fraction were all less than one percent. The new technique yields accurate determinations of chemistry for the smectitic and illitic phases in mixed-layered smectiteillite, and qualitative estimates for the chemistry of 10 Å-illite. The elemental compositions of quartz and kaolinite are assumed a priori and treated as constants within the non-linear chemical mass balance model.

Keywords

ChemistryIlliteMass-balanceProtoilliteQuantifySmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 6 , December 1994 , pp. 747 - 754
Copyright
Copyright © 1994, Clay Minerals Society

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References

Alexiades, C. A., and Jackson, M. L.. 1965 . Quantitative determination of vermiculite in soils. Soil Sci. Soc. Am. Proc. 29: 522–527.CrossRefGoogle Scholar
Alexiades, C. A., and Jackson, M. L.. 1966 . Quantitative clay mineralogical analysis of soils and sediments. Clays & Clay Miner. 14: 35–52.CrossRefGoogle Scholar
Barak, P. J. A. E., Molina, A. Hadas, and Clapp, C. E.. 1990 . Optimization of an ecological model with the Marquardt algorithm. Ecol. Modell. 51: 251–263.CrossRefGoogle Scholar
Bevington, P. R., 1969. Data reduction and error analysis for the physical sciences. New York: McGraw-Hill, 336 pp.Google Scholar
Bish, D. L., 1993. Studies of clays and clay minerals using X-ray powder diffraction and the Rietveld Method. In CMS Workshop Lectures, Vol. 5, Computer Applications to X-ray Powder Diffraction Analysis of Clay Minerals. C. Reynolds, R. Jr. and Walker, J. R., eds. Boulder, Colorado: The Clay Mineral Society, 79–121.Google Scholar
Braun, G. E., 1986. Quantitative analysis of mineral mixtures using linear programming. Clays & Clay Miner. 34: 330–337.CrossRefGoogle Scholar
Brindley, G. W., 1980. Quantitative mineral analysis of clays. In Crystal Structures of Clay Minerals and Their X-ray Identification. Brindley, G. W., and Brown, G., eds. London: Mineralogical Society, 411–438.CrossRefGoogle Scholar
Calvert, C. S., Palkowsky, D. A., and Pevear, D. R.. A combined X-ray powder diffraction an chemical method for the quantitative mineral analysis of geologic samples. In CMS Workshop Lectures, Vol. 1, Quantitative Mineral Analysis of Clays. Pevear, D. R., and Mumpton, F. A., 1989 eds. Boulder, Colorado: The Clay Minerals Society, 154–166.Google Scholar
Dixon, J. B., 1966. Quantitative analysis of kaolinite and gibbsite in soils by differential thermal and selective dissolution methods. Clays & Clay Miner. 14: 83–89.CrossRefGoogle Scholar
Engler, P., and Iyengar, S. S.. 1987 . Analysis of mineral samples using a combined instrument (XRD, TGA, ICP) procedures for phase quantification. Amer. Mineral. 72: 832–838.Google Scholar
Gold, C. M., Cavell, P. A., and Smith, D. G. W.. 1983 . Clay minerals in mixtures: Sample preparation, analysis, and statistical interpretation. Clays & Clay Miner. 31: 191–199.CrossRefGoogle Scholar
Hodgson, M., and Dudeney, A. W. L.. 1984 . Estimation of clay proportions in mixtures by X-ray diffraction and computerized chemical mass balance. Clays & Clay Miner. 32: 19–28.CrossRefGoogle Scholar
Johnson, L. J., Chu, C. H., and Hussey, G. A.. 1985 . Quantitative clay mineral analysis using simultaneous linear equations. Clays & Clay Miner. 33: 107–117.CrossRefGoogle Scholar
Kolka, R. K., Laird, D. A., and Nater, E. A.. 1994 . Comparison of four elemental mass balance methods for quantitative clay mineralogy. Clays & Clay Miner. 42: 437–443.CrossRefGoogle Scholar
Kunze, G. W., and Dixon, J. B.. 1986. Pretreatment for mineralogical analysis. In Agronomy Monogr. 9, Methods of Soil Analysis, Part 1, 2nd ed. A Klute, ed. Madison, Wisconsin: ASA and SSSA, 91–100.Google Scholar
Laird, D. A., Barak, P., Nater, E. A., and Dowdy, R. H.. 1991a . Chemistry of smectitic and illitic phases in interstratified soil smectite. Soil Sci. Soc. Amer. J. 55: 1499–1504.CrossRefGoogle Scholar
Laird, D. A., Dowdy, R. H., and Munter, R. C.. 1991b . Suspension nebulization analysis of clays by inductively coupled plasma-atomic emission spectroscopy. Soil Sci. Soc. Amer. J. 55: 274–278.CrossRefGoogle Scholar
Laird, D. A., and Nater, E. A.. 1993 . Nature of the illitic phase associated with randomly interstratified smectite/illite in soils. Clays & Clay Miner. 41: 280–287.CrossRefGoogle Scholar
Nadeau, P. H., Tait, J. M., McHardy, W. J., and Wilson, M. J.. 1984 . Interstratified XRD characteristics of physical mixutres of elementary clay particles. Clay Miner. 19: 67–76.CrossRefGoogle Scholar
Pearson, M. J., 1978. Quantitative clay mineralogical analyses from the bulk chemistry of sedimentary rocks. Clays & Clay Miner. 26: 423–433.CrossRefGoogle Scholar
Slaughter, M., 1989. Quantitative determination of clays and other minerals in rocks. In CMS Workshop Lectures, Vol. 1, Quantitative Mineral Analysis of Clays. Pevear, D. R., and Mumpton, F. A., eds. Boulder, Colorado: The Clay Minerals Society, 120–151.Google Scholar
Theissen, A. A., and Harward, M. E.. 1962 . A paste method for preparation of slides for clay mineral identification by X-ray diffraction. Soil Sci. Soc. Amer. Proc. 26: 90–91.CrossRefGoogle Scholar