Estimation of Fe2+/Fe3+ and Mn2+/Mn3+ Ratios by Electron Probe Micro Analyzer.
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Accession number;00A0194400
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| Title;Estimation of Fe2+/Fe3+ and Mn2+/Mn3+ Ratios by Electron Probe Micro Analyzer. |
| Author;
KIMURA YOSHIO
(Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN)
AKASAKA MASAHIDE
(Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN)
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Journal Title;Journal of the Mineralogical Society of Japan
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Journal Code:G0124A
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ISSN:0454-1146
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VOL.28;NO.4;PAGE.159-166(1999)
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| Figure&Table&Reference;FIG.2, TBL.2, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We have reinvestigated the relationship between the relative intensities of L.ALPHA. and L.BETA. X-ray emission peaks, [L.BETA./L.ALPHA.], and Fe2+/Fe3+ or Mn2+/Mn3+-ratios in silicate minerals. For Fe-bearing silicates, two kinds of regression lines were obtained; (1) 0.LEQ.[Fe2+/(Fe2++Fe3+)].LEQ.0.74: [L.BETA./L.ALPHA.]Fe=0.1414*[Fe2+/(Fe2++Fe3+)]+0.4121 (R2=0.986), (2) 0.74.LEQ.[Fe2+/(Fe2++Fe3+)].LEQ.1.00: [L.BETA./L.ALPHA.]Fe=0.8024*[Fe2+/(Fe2++Fe3+)]-0.0798 (R2=0.973). By using these regression lines, it is possible to estimate semiquantitative Fe2+/(Fe2++Fe3+)-ratio of Fe-silicates containing total FeO more than 5 wt.%. For Mn-bearing silicates, a regression line of [L.BETA./L.ALPHA.]Mn=0.46*[Mn2+/(Mn2++Mn3+)]+0.554 (R2=0.968) was obtained. However, even if samples contain total MnO more than 10 wt.%, standard deviation of [L.BETA./L.ALPHA.]Mn-ratio for each sample is large. Thus, [L.BETA./L.ALPHA.]Mn-ratio can not be used for semiquantitative determination of Mn2+/(Mn2++Mn3+)-ratio but gives us qualitative information. (author abst.) |
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