青岛霾天气下大气汞的污染特征分析
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2020-02-28 15:32:40
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中国环境科学2014,34(8):1905-1911ChinaEnvironmentalScience青岛霾天月山]豸里气下大气汞的污染特征分析张玉卿,一,刘汝海,,崔雪晴,-,周建平,一,王艳1,2(1冲国海洋大学环境科学与工程学院山东青岛266100;2.中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100)摘要:2013年1月14~17日青岛市经历了一次大范围的霾污染过程,采集并测定大气气态汞和颗粒态汞,研究汞的污染特征.结果表明,气态汞(TGM)的平均浓度为(2.8+0.9)ng/m3,颗粒汞(PHg)的平均浓度为(245±174)pg/m3.在霾发生的14、15日PHg/TSP的比值明显高于16、17日.且TGM与PHg浓度呈负相关关系,霾日气象条件有利于TGM向PHg转化.大气汞浓度与温度、相对湿度正相关,与风速负相关.TGM与SO2、NO2显著正相关,化石燃料的燃烧是大气汞的主要来源.对大气气团的后向轨迹进行聚类分析,将其分为5类,霾日大气中的汞主要来自近距离传输,受山东本地污染影响,气态汞含量最高.关键词:大气汞:雾霾;青岛;轨迹分析中图分类号:X131.1文献标识码:A文章编号:1000—6923(2014)08一l905—07ThecharacteristicanalysisofatmosphericmercuryduringhazedaysinQingdao.ZHANGYu-qing“,LIURu-hai,CUIXue.qing‘,ZHOUJian.ping,WANGYan。(1_CollegeofEnvironmentalScienceandEngineering,OceanUniversityofChina,Qingdao266100,China;2.KeyLaboratoryofMarineEnvironmentalScienceandEcology,MinistryofEducation,OceanUniversityofChin~Qingdao266100,China).ChinaEnvironmentalScience,2014,34(8):1905~1911Abstract:Inordertoinvestigatethecharacteristicsofatmosphericmercurypollution,totalgaseousmercury(TGM)andparticulatemercury(PHg)sampleswerecollectedinQingdaoduringJanuary14—17,2013,whenaserioushazeeventoccurred.TheresultsshowedthattheaverageconcentrationsofTGMandPHginQingdaodunngthishazeeventwere(2.8~0.9)nrdmand(245~174)pg/m,respectively.Onhazedays(January14and15),therewasanegativecorrelmionbetweenTGMandPHg,andTGM/PHgratioswerehigherthanthatonnon-hazedays(January16and17),indicatingthatmeteorologicalconditionswouldpromotethetransformationofTGMtoPHg.CorrelationanalysisbetweenmercuryconcentrationsandenvironmentalfactorsshowedthatbothTGMandPHgwerepositivelyco.elatedwithtemperatureandrelativehumidity,andnegativelycorrelatedwithwindspeed.TGMWaspositivelycorrelatedwithSO2andNO2,suggestingfossilfuelcombustionWasitsmajorsource.Thepathwaysofairmassesassociatedwiththemercurysampleswereclassifiedinto5categoriesbasedclusteranalysis.AtmosphericmercuryinQingdaoduringthiseventwasmainlyinfluencedbyshon-rangetransport.theinfluenceoflocalpollutionfromShandongareacontributedtothehighest
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