贵阳市大气中气态汞形态分布特征的初步研究

BulletinofMineralogy,PetrologyandGeochemistryVol.22No.2,2003Apr.:20030115,0315:!(40273041):(1979∀),,,商立海1,2,冯新斌1,郑伟1,2,阎海鱼1,21,550002;2,100039:2002年3月份我们对贵阳市大气的气态汞形态进行了采样分析大气气态总汞用Tekran2537A大气自动测汞仪采集测定活性气态汞用镀KCl扩散管采集,热还原法分解并以冷原子荧光法(CVAFS)分析结果显示,采样期间贵阳市气态总汞平均浓度为7.09ngm3,活性气态汞平均含量38.3pgm3气态总汞浓度远高于全球背景浓度值;活性气态汞浓度稍高于欧洲和美国的边远地区活性气态汞浓度与大气相对湿度呈负相关关系,相关系数为-0.39(0.01)由于大气相对湿度较高,活性气态汞只占气态总汞的0.5%原子态汞和活性气态汞的基本来源是燃煤释放:气态总汞;活性气态汞;镀KCl扩散管法:X16:A:10072802(2003)0201560395%[1],(Hg0)(RGM)1.5~2.0ngm3[2];pgm3[3,4],,,,,:W.J.StrattonS.E.Lindberg[5,6];KCl[7~9],KCl1实验200233~25,,,[10]20kmTekran2537A,5min,1.5LminKCl,1Lmin,6~10h,(Tekran2500)(GL300BWeatherstationGlobalLogger#B)()5min,Tekran2537A2结果与讨论21,19;123.2∃18.7%,2Fig.2TemporalvariationofTGMandRGMconcentrationsduringthesamplingperiod3Fig.3CorrelationbetweenRGMandrelativehumidity1Fig.1ComparisonofRGMmeasurementsfromtwoparallellines,0.26(0.05)(2),7.09ngm338.3pgm31.5~2.0ngm3,3~4[3,4],,,(3),-0.39(0.01)[11,12]S.Tang[13],HgCl2,0.5%,(6%)[13]157Hg0,,Hg0;,,[12,14]199910,,,(453.8pgm3)(3.9%),,,[12,14],3结论,,(Hg0):(Referrence)[1]MuntheJ,WngbergI,PirroneN,IverfeldtA,FerraraR,EbinghausR,FengX.Intercomparisonofmethodsforsamplingandanalysisofatmosphericmercuryspecies[J].Atmos.Environ.,2001,35:3007-3017.158[2]MasonR,FitzgeraldWF,MorelMM.Thebiogeochemicalcyclingofelementalmercury:anthropogenicinfluences[J].Geochim.Cosmochim.Acta,1994,58:3191-3198.[3]SommarJ,FengXB,GardfeldtK,LindqvistO.MeasurementsoffractionatedgaseousmercuryconcentrationsovernorthwesternandcentralEurope,1995-99[J].J.Environ.Monit.1999,1:435-439.[4]LindbergSE,StrattonWJ.AtmosphericMercurySpeciation:ConcentrationandbehaviorofReactivegaseousmercuryinambientair[J].Environ.Sci.Technol.,1998,32:49-57.[5]StrattonWJ,LindbergSEUseofarefluxingmistchamberformeasurementofgasphasemercury(%)speciesintheatmosphere[J].WaterAirSoilPollut.,1995,80:1269-1278.[6]StrattonWJ,LindbergSE,PerryCJ.AtmosphericMercurySpeciation:LaboratoryandFieldEvaluationofaMistChamberMethodforMeasuringReactiveGaseousMercury[J].Environ.Sci.Techno.,2001,35:170-177.[7]XiaoZ,SommarJ,WeiS,LindqvistO.SamplinganddeterminationofgasphasedivalentmercuryintheairusingaKClcoateddenuder[J].Fresenius&J.Anal.Chem,1997,358:386-391.[8]FengXB,SommarJ,GrdfeldtK,LindqvistO.ImproveddeterminationofgaseousdivalentmercuryinambientairusingKClcoateddenuders[J].Fresenius&J.Anal.Chem.2000,366:423-428.[9]LandisMS,StevensRK,SchaedlichF,PrestboEM.SpeciationofaqueouschromiumbyuseofsolidphaseextractionsinthefieldEnviron.Sci.Technol.,2002,36:3000-3009.[10]FengX,TangS,ShangL,YanH.TotalgaseousmercuryintheatmosphereofGuiyang,PRChina[J].Sci.TotalEnviron.,2003.Submmitted.[11]FengX,HongY.ModesofcccurenceofmercuryincoalfromGuizhou,Pepoles&sRepublicofChina[J].Fuel,1999,78:1181-1188.[12]FengX,SommarJ,LindqvistO,HongY,Occurrence,emissionanddepositionofmerciryfromcoalcombustionintheProvinceGuizhou,China[J].Water,Air,andSoilPollut.,2002,139:311-324.[13]TangS,FengX,ShangL,MercuryspeciationandemissionsfromasmallscalecoalfiredboilerinGuiyang,PRChina[J].J.Phys.,2003.Submitted[14],JonasSommar,OliverLindqvist,.[J].,2003,.FengXinbin,JonasSommar,OliverLindqvist,ZhuYongxuan.ImproveddeterminationofgaseousdivalentmercuryinambientairusingKClcoateddenuders[J].ChineseJournalofAnalyticalChemistry,2003.Submitted.PreliminarystudyofthedistributionofgaseousmercuryspeciesintheairofGuiyangCity,ChinaSHANGLihai1,2,FENGXinbin1,ZHENGWei1,2,YANHaiyu1,21StateKeyLaboratoryofEnvironmentalGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,China;2GraduateSchooloftheChineseAcademyofSciences,Beijing100039,ChinaAbstract.TGMandRGMconcentrationsinambientairatonesiteofGuiyangCityweredeterminedinMarch2002.TGMconcentrationsweremonitoredusinganautomatedmercuryvaporanalyzerTekran2537A,andRGMinambientairwassampledusingKClcoatedtubulardenuders.ThesampledRGMdenuderswereanalyzedusingthermaldesorptioncoupledwithCVAFSdetection.TheaverageconcentrationsofTGMandRGMare7.09ngm-3and38.3pgm-3,respectively,duringthesamplingperiod.TheprimaryanthropogenicsourceforbothHg0andRGMiscoalcombustioninthestudyarea.TGMconcentrationsaresignificantlyelevatedcomparingtotheglobalbackgroundvalues,whereasRGMconcentrationsareonlyslightlyhigherthanthereportedvaluesinremoteareasinEuropeandUS.RGMonlyconstitutes0.5%ofTGMintheairatthesamplingperiod.ThereisasignificantnegativecorrelationbetweenRGMconcentrationandrelativehumidity(RH),withacoefficientcorrelationof-0.39(0.01).HighrelativehumidityduringthesamplingisresponsiblefortherelativelylowRGMconcentrationsobserved.Keywords:TGM;RGM;KClcoateddenuder