TERRAPUB Geochemical Journal

Geochemical Journal, Vol. 51 (No. 6), pp. 583-588, 2017


Convenient analysis of chemical composition of clay fraction of sediment by electron probe microanalyzer

Youko Miyoshi,1,2* Kazuhiko Shimada,1 Hiroshi Sato,3 Seiichiro Uehara1 and Jun-ichiro Ishibashi1

1Graduate School of Science, Kyushu University, Japan
2Research institute for Geo-Resources and Environment, National institute of Advanced Industrial Science and Technology (AIST), Japan
3School of Business Administration, Senshu University, Japan

(Received September 30, 2016; Accepted March 23, 2017)

Abstract: We developed a convenient sample preparation method applicable to electron probe microanalysis (EPMA) of the clay fraction of sediment. The clay fraction separated from original sediment by elutriation was pasted evenly on an area of about 1 cm × 1 cm on a copper plate. After the sample had dried at room temperature, it was subjected to EPMA analysis using the maximum electron beam diameter (30 μm). This method provides adequate results, consistent with those obtained by X-ray fluorescence in the case of intensely hydrothermally altered sediments collected from a seafloor hydrothermal field. The major merit of this method is the small amount of clay fraction required (about 10 mg), which saves time in sample preparation. We call this method the "Cu-EPMA method."
Key words: clay minerals, convenient chemical analysis, copper plate, electron probe microanalyzer, X-ray fluorescence

*Corresponding author E-mail: youko-miyoshi@aist.go.jp

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