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稀土元素在红壤、黄棕壤及淋溶黑钙土中赋存形态的研究(英文).docx

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稀土元素在红壤、黄棕壤及淋溶黑钙土中赋存形态的研究(英文) ResearchontheOccurrenceFormofRareEarthElementsinRedSoil,YellowBrownSoil,andWeatheredBlackCalcareousSoil Introduction Rareearthelements(REEs)refertoagroupof17elementsthathaveuniqueproperties,includingmagnetic,luminescenceandcatalyticproperties.Theyarewidelyusedinfieldssuchasmilitary,aerospace,electronicsandmetallurgy(Prasadetal.,2016).Chinaistheworld'sleadingproducerofREEs,accountingformorethan80%ofglobalproduction.TheoccurrenceformofREEsinsoilsiscloselyrelatedtotheiravailabilityandenvironmentaleffects.Inthisstudy,theoccurrenceformofREEsinredsoil,yellowbrownsoilandweatheredblackcalcareoussoilwereinvestigated. MaterialsandMethods Soilsampleswerecollectedfromthreesoiltypes:redsoil,yellowbrownsoilandweatheredblackcalcareoussoil.Thesoilsampleswereair-dried,crushedandpassedthrougha2mmsieve.ThetotalREEswereextractedusingamixtureofhydrochloricacid(HCl)andnitricacid(HNO3).TheextractedREEswereanalyzedusinganinductivelycoupledplasmamassspectrometer(ICP-MS).ThesequentialextractionmethodwasusedtodeterminetheoccurrenceformofREEsinthesoils. Results ThetotalREEsconcentrationinthethreesoilswas60.65mg/kginredsoil,54.25mg/kginyellowbrownsoiland37.67mg/kginweatheredblackcalcareoussoil.TheaverageconcentrationofREEsinthesoilfollowsthesequenceofredsoil>yellowbrownsoil>weatheredblackcalcareoussoil.TheoccurrenceformofREEsinthethreesoilswasdifferent. Inredsoil,theexchangeableandcarbonateformsweredominant,withanaverageproportionof40.52%and35.04%,respectively.Thismaybeduetothestrongweatheringandleachingofthesoil,whichleadstotheenrichmentofREEsintheupperlayerofthesoil.TheproportionofREEsintheresidualformwasthelowestinredsoil,accountingforonly3.65%. Inyellowbrownsoil,theresidualformdominated,withanaverageproportionof45.62%.Theproportionsofexchangeableandcarbonateformswere22.94%and23.23%,respectively.ThehighproportionofresidualformmaybeduetothelowpHvalueandhighorganicmattercontentofthesoil,whichleadstothelowmobilityofREEs. Inweatheredblackcalcareoussoil,thecarbonatef