Title Quantitative analysis of major elements in igneous

Title
Quantitative analysis of major elements in igneous rocks with X-ray
fluorescence spectrometer “ZSX primus II” using a 1:10 dilution glass
bead
Author(s)
Kusano, Yuki; Umino, Susumu; Kobayashi, Jinya; Mizukami, Tomoyuki;
Okuno, Masayuki; Arai, Shoji
Citation
The science reports of the Kanazawa University = 金沢大学理科報告, 58:
31-44
Issue Date
2014
Type
Departmental Bulletin Paper
Text version
publisher
URL
http://hdl.handle.net/2297/41282
Right
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*著作権法に規定されている私的使用や引用などの範囲を超える利用を行う場合には，著作権者の許諾を得てください。ただし，著作権者
から著作権等管理事業者（学術著作権協会，日本著作出版権管理システムなど）に権利委託されているコンテンツの利用手続については
，各著作権等管理事業者に確認してください。
http://dspace.lib.kanazawa-u.ac.jp/dspace/
32
QuantitativeanalysisofmajorelementsinigneousrockswithXRF
11ntroduction
AwavelengthdispersiveX-rayfluorescencespectrometer(XRF)ZSXprimusII
(RigakuComoration)hasbeenlaunchedinEarthScienceCourse,SchoolofNatural
Systems,CollegeofScienceandEngineering,KanazawaUniversitysinceNovember
2013.TheinstrumentwasusedfOrscientificstudiesbyresearchersofKanazawa
University(Otsukaetal.,2014a;Hamadaetal.,2014)andvisitors,andfOreducationof
undergraduatestudentsinthefirstyear.Becausesamplepreparationishandyandthe
originalprogramsofqualitativeandsen-quantitativeanalysesinstalledintheZSX
primusllareeasyfOrabeginnertouse,theinstrumenthasbeen廿equentlyusedfOr
researchesinmaterialengineeringandarcheology.However,theresultsofthesemquantitativeanalysesofsomeultramaficrockglassbeadsgivetwiceashighNiandCr
contentsastherecommendedvalues.Becausetheseelementsarecriticalinthefieldof
earthsciences,theanalyticalproceduresarerequiredtobemoreaccuratefOr
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andbasalticrocks,andultramaficrocks.
34
QuantitativeanalysisofmajorelementsinigneousrockswithXRF
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36
QuantitativeanalysisofmajorelementsinigneousrockswithXRF
SAnalyticalConditions
3､1InstrumentCondition
Aglassbeadissetonastainlesssteelsampleholderwiththemeasurementsurfaceup.
Thebeadisscreweduptobeincontactwithasamplemaskwithahole30nnnin
diameterinthecenter.Afterpassingthroughtheheightchecker,thesampleholderisset
onthesamplestage.48sampleholderscanbesetonthestage.Weusuallysetasample
usedfbrcalibrationofthePulseHeightAnalyzer(PHA)onthestageno.H-1.Unknown
samplesaresetonother47stages.
TheZSXprimusllisequippedwithanend-windowX-raytubeandarhodiumanode,
andiscontrolledbyZSXsoftwarerunonawindows7personalcomputer.AsZSXis
runandX-rayistumedon,ZSXautomaticallysetstheaccelerationvoltageandelectric
currentto50kVand50mA,respectivelyandadjuststheX-raycounterbymeasuring
thecalibrationsampleonthestageno.H-1.
3.2MeaSuringbasaltandandesitewith66Majorl2''
3.2.1Calibrationlines
TenmajorelementsSi,Ti,Al,Fe,Mn,Mg,Ca,Na,KandPareanalyzedbyan
applicationprogram"Majorl2''inlOnnutes.The加strumentconditionsofeach
elementarelistedinTable3.
ElevenGSJstandardandonesyntheticsamplesareusedtomakecalibrationlines.A
regressioncalculationwasdonebytheZSXsoftware.KUlinesofSi,Fe,Mg,CaandK
aremeasuredfbr40secondsatpeakpositionsonlybecausepeaktobackgroundX-ray
countratiosarelargesothatthedifferencesofthegrossandnetpeakcountsare
negligible.BothpeakandbackgroundX-rayintensitiesaremeasuredfOrKUlinesofTi,
Al,Mn,NaandP,basedonwhichbackgroundcorrectionsaremade.Thegrossandnet
countratesarelinearlycorrelatedwiththemass廿actiOnofoxides,yieldinglinear
calibrationlinesofallmajorelements(Figurel).However,JG-2showshigherPKq
intensitythanthatexpectedfbrtheP205concentrationofthereconnnendedvalue.Since
repeatedmeasurementsofJG-2showhigherPintensities,JG-2wasexcludedfromP205
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fiactionsofmajorelementoxidesarebetterthanO．99fOrallelements.Asshowninthe
enlargedplotsofA1203andMgO,X-rayintensitiesandthemass廿actionsofoxidesare
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ThecalibrationrangesandaccuracyofeachelementareshowninTable4.The
accuracyofacalibrationlineisgivenby

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