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1、AnalysisofSoilintheFieldusingportableFTIRAHJeanRobertson,HRachaelHill,AngelaMMainInternationalWorkshop“SoilSpectroscopy:thepresentandfutureofSoilMonitoring”FAOHQ,Rome4-6December2013FTIRofSoil•AnFTIR(FourierTransformInfrared)spectruminthemidinfrared(MIR)region,producedwheninfrar
2、edradiationisabsorbedbyasoilsample,givestheoverallchemicalprofileofthesoil•Importantly,FTIRspectracanprovideinformationaboutboththeorganicandmineralcomponentsofthesoil•AbsorptionbandsintheIRspectrum(4000to400cm-1)relatetofundamentalvibrationsofthefunctionalgroupspresentinthesam
3、pleNontronite%TransmittanceFrequency(cm-1)InterpretationofanFTIRspectrumofSoilTheIRspectrumofasoilsamplecanbereadilyinterpretedtogiveinformationonthenatureandproportionsofthesoilorganicmatterandthemineralspresentFTIRorNIRforsoilanalysis?NIRspectrum•Todate,theNIRspectralrange,wi
4、thdiffusereflectancespectra,hasbeenmorewidelydevelopedthantheFTIRtechniqueusingAlbichisticPodzoltheMIRrange•ItisseenasbeingcheaperandhavingtechnologythatismoreeasilyFTIRspectrumtransferabletothefieldCalibrationsofIRspectraagainstsoilproperties•Calibrations,developedbycorrelatin
5、gthespectrato“wetchemistry”soilanalyses,givethepotentialtopredictawholerangeofattributesofasoilfromasinglespectrum•CalibrationshavebeendevelopedforbothNIRandFTIRspectra,includingoneforSoilBulkDensity(BD)ForthebestFTIRBDequationdeveloped,predictedversusactualresultsforanindepend
6、entvalidationsetof55soilshadthefollowingstatistics:R2=0.903,SEP=0.101,bias=-0.0105andRPD(SD/SEP)=3.29ForthebestNIRBDequationdeveloped,predictedversusactualresultsforanindependentvalidationsetof55soilshadthefollowingstatistics:R2=0.865,SEP=0.126,bias=-0.021andRPD(SD/SEP)=2.6Port
7、ableFTIRLabBasedFTIRAllFTIRfeaturesincorporatedintoSchematicofantheExoScan(Agilent),ahandheldFTIRSpectrometerdevicePortableFTIRMovingFTIRAnalysisintotheField•ThehandheldFTIRallowsinsitucharacterisationofsamples•Nosamplepreprequired•Nondestructive•Forsoilanalysis,however,problem
8、screatedbyvariablesoilmoistureandvariableparticlesizei
