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(DOC) Geochemistry

By Gerald Diaz,2014-07-22 03:00
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Geochemistry

    Geochemistry

Vo1.25(Supp1.)2006CHINESEJ0URNALGE0CHEMISTRY21

    ;SeventoplayerrepresentativesedimentsamplesweretookfromtheWenruitangheRiverfromupstreamtodownstream.Spatial

    ;distributionofnitrificationanddenitrificationratesofsedimentwasreported.Ectofexternalpollutionalsource.including

    ;dischargeofleatherworkingfactory,architecturalwastedischargeanddomesticwastewateronthenitrificationanddenitrification

    ;ratesofsedimentwasreported.Thesedimentshaveadenitrificationrateofabout12ordersofthenitrificationrate.Theresultshows

    ;thatthenitrificationratesofsedimentsinthedescendingorder:sedimentnearthemidstreamofthemainrivercourseof

    ;Wenruitanghe(10.8mg’kg’L’h-),sedimentintheupstreamofWenruitanghe

    nearfarmlandarea(5.7mg’kg’.h),sediment

    ;nearthetanningfactory(4.2mg?kg

    ?L..?h),sedimentattheseriousdomesticandindustrywastewaterpollutantareawhichhasthe

    ;highestdenitrificationrate(3.4mg’kg’L

    .h),sedimentinthedownstreamofWenruitanghe(1.8mg.kg’L-1.h),sedime

    ntatthe

    ;seriousarchitecturalwasteandwastewaterpollutantareawhichhasthelowestdenitrificationrate(1.4mg’kg’L;.h)andsediment

    ;innearwaterpointfromtheOujiangRiver(0.7mg?kg..-L

    -h).Thesedimentattheseriousdomesticandindustrywastewater ;pollutantareahasthehighestdenitrificationrate(351.1mg-kg’L..?h),follow

    edbysedimentneartanningfactory(318.2

    ;mg?kg.1.L-1.h-1),sedimentinnearwaterpointfromtheOujiangRiver(211.1mg’kg’L-1.h-1),sedimentnearthemidstreamofthe

    ;mainrivercourseofWenruitanghe(196.5mg?kg;.L-1.h),sedimentofthem

    ainrivercourse(1l7.0mg’kg..’L-1.h),sedimentinthe

    ;upstreamofWenruitanghenearfarmlandarea(79.1mg?kg.L..-h),sedimentattheseriousarchitecturalwasteandwastewater

    ;pollutantareawhichhasthelowestdenitrificationrate(70.1mg?kg.1.L.h).Themoreseriousthepollutionstate,thehigherthe

    ;denitrificationrateofsediment.Sedimentwithalargedenitrificationratedoesnotalwayshavelownitrificationrate.

    ;Keywordssediment;nitrogen;nitrification;denitrification ;Geochemistryofsulfurandhazardoustraceelementsincoalsanditsbearingonhuman

    ;health

    ;ChenlinCH0U

    ;IllinoisStateGeologicalSurvey(Emeritus),Champa~n,1L,USA

;Mailingaddress:3007ValleyBrookDrive,Champa~n,1L61822,USA,”E-

    mail:chenlinchou@hotmaileom

    ;Hazardousairpollutants.includingcompoundsofsulfurandtoxictraceelements.areemittedduringcoalcombustion.Geochemical

    ;studiesoftheseconstituentsincoalsprovideinformationabouttheirspecies.regionaldistributionandorigins.Thedataareusefulin

    ;understandingthecauseandscopeofhumanhealthproblemsrelatedtothesehazardouselementsandindesigningpreventiveor

    ;remedialmeasures.Sulfurincoalisaproblembecausesulfurdioxideemittedduringcoalcombustionisamainsourceofacidrain.

    ;Thesulfurisotopicevidenceshowsthatsulfurinlowsulfurcoalisderivedpr

    imarilyfromparentplantmaterials.Sulfurenrichment

    ;inmediumandhighsulfurcoalsiscausedbythesulfateinseawater

    atfloodedthepeatswampduringcoalformation.Thesulfur

    ;contentofacoaliscontrolledprimarilybythedepositionalenvironmentofcoalseams.Onlypyriticsulfurcanberemovedby

    ;physicalcoalcleaningprocesses(coalpreparation).Sulfurdioxideemissioncanbereducedusingcleancoaltechnologies,suchas

    ;fluegasdesulfurization,fluidizedbedcombustion,andintegratedgasifi

    cationandcombinedcycle.

    ;CombustionofhighfluorinecoalscausesendemicfluorosisinsouthwesternChina.Recentstudiesshowthatfluorosismaybe

;causedbyfluorinerichclayswhichareusedasabinderinbriquettemakin

    gbylocalresidents.Endemicarsenicosiscausedby

    ;domesticburningofhigh.arseniccoalshasoccurredinsouthwesternGuizhou

    arseniccoa1.whichisdistributedin .China.Thehigh

    ;localizedareas.resultedfromhydrothermalmineralization.EndemicseleniumpoisoninginlocalitiesofHubeiandShaanxiprovinces,

    ;China.iscausedbyburninghighseleniumstonecoals(metamorphosedcar

    bonaceousshale).Coal-firedpowerplantsarethelargest

    ;sourceofhumancausedmercuryemissionintheUnitedStates.Waystomonitorandcapmercuryemissionarebeingimplemented.

    ;Compoundsofotherconstituentsincoals,includinglithophilessuchasBe,K,Mn,Cr,Co,Th,andUandchacophilessuchasCd,Sb,

    ;andPb.havealsobeenidentifiedashazardousairpollutants.Thelithophileelementsarerelativelylowincoalsascomparedwith

    ;Earth’suppercontinentalcrustfucc).ThechalcophileelementsaresignificantlyhigherinmanycoalsthantheUCC,buttheymay

    ;bereducedbyphysicalcoalcleaningprocessesbecauseoftheirassociationwithsulfdeminerals.

    ;Keywordsgeochemistry;sulfurandhazardoustraceelements;coal;humanhealth

    ;

    ;

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