Quantitative elemental microanalysis of rough-surfaced soil specimens in the scanning electron microscope using a peak-to-background method

L. A. Sullivan, R. T. Bush

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Scanning electron microscopy is very useful for morphological examination of pedofeatures. Whenever quantitative elemental microanalysis of pedofeatures has been required during such morphological examinations, either thin sections or polished resin-impregnated blocks across similar pedofeatures have had to be prepared to satisfy the smooth flat surface requirement of currently used electron microanalytical methods. This pre-requisite has been accompanied by both conceptual and technical problems. A direct method for obtaining quantitative elemental microanalyses of rough-surfaced soil specimens in the scanning electron microscope is examined here. This method is based on the use of peak-to-background ratios in energy dispersive X-ray spectra. Analysis of a pyrite standard at a range of geometrys of analysis and of the iron sulphide minerals in two Holocene sediments indicates that the peak-to-background method can be used to obtain reliable quantitative elemental compositions of rough-surfaced soil specimens in the scanning electron microscope. Under ideal operating conditions (i.e., flat, polished specimens), the peak-to-background method will not be as accurate as the currently used peak integral methods; however, the results here indicate that the peak-to-background method has, for the analysis of soil, the important advantage of being able to directly provide reliable quantitative elemental microanalyses of pedofeatures on rough-surfaced soil specimens in the scanning electron microscope.

Original languageEnglish
Pages (from-to)749-757
Number of pages9
JournalSoil Science
Volume162
Issue number10
DOIs
Publication statusPublished - 1997
Externally publishedYes

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scanning electron microscopes
electron
soil
methodology
sulfide minerals
soil analysis
iron sulfide
resins
method
quantitative analysis
thin section
X-radiation
scanning electron microscopy
electrons
resin
pyrite
iron
sediments
Holocene
energy

Cite this

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abstract = "Scanning electron microscopy is very useful for morphological examination of pedofeatures. Whenever quantitative elemental microanalysis of pedofeatures has been required during such morphological examinations, either thin sections or polished resin-impregnated blocks across similar pedofeatures have had to be prepared to satisfy the smooth flat surface requirement of currently used electron microanalytical methods. This pre-requisite has been accompanied by both conceptual and technical problems. A direct method for obtaining quantitative elemental microanalyses of rough-surfaced soil specimens in the scanning electron microscope is examined here. This method is based on the use of peak-to-background ratios in energy dispersive X-ray spectra. Analysis of a pyrite standard at a range of geometrys of analysis and of the iron sulphide minerals in two Holocene sediments indicates that the peak-to-background method can be used to obtain reliable quantitative elemental compositions of rough-surfaced soil specimens in the scanning electron microscope. Under ideal operating conditions (i.e., flat, polished specimens), the peak-to-background method will not be as accurate as the currently used peak integral methods; however, the results here indicate that the peak-to-background method has, for the analysis of soil, the important advantage of being able to directly provide reliable quantitative elemental microanalyses of pedofeatures on rough-surfaced soil specimens in the scanning electron microscope.",
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AU - Bush, R. T.

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AB - Scanning electron microscopy is very useful for morphological examination of pedofeatures. Whenever quantitative elemental microanalysis of pedofeatures has been required during such morphological examinations, either thin sections or polished resin-impregnated blocks across similar pedofeatures have had to be prepared to satisfy the smooth flat surface requirement of currently used electron microanalytical methods. This pre-requisite has been accompanied by both conceptual and technical problems. A direct method for obtaining quantitative elemental microanalyses of rough-surfaced soil specimens in the scanning electron microscope is examined here. This method is based on the use of peak-to-background ratios in energy dispersive X-ray spectra. Analysis of a pyrite standard at a range of geometrys of analysis and of the iron sulphide minerals in two Holocene sediments indicates that the peak-to-background method can be used to obtain reliable quantitative elemental compositions of rough-surfaced soil specimens in the scanning electron microscope. Under ideal operating conditions (i.e., flat, polished specimens), the peak-to-background method will not be as accurate as the currently used peak integral methods; however, the results here indicate that the peak-to-background method has, for the analysis of soil, the important advantage of being able to directly provide reliable quantitative elemental microanalyses of pedofeatures on rough-surfaced soil specimens in the scanning electron microscope.

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