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《松花江沉积物重金属形态赋存特征研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(1):163—167JournalofAgro—EnvironmentScience松花江沉积物重金属形态赋存特征研究张凤英1,2,3,阎百兴1,朱立禄(1.中国科学院东北地理与农业生态研究所,长春130012;2.中国科学院地理科学与资源研究所,北京100101;3.中国科学院研究生院,北京100039)摘要:采用Tessier连续提取法分析了松花江表层沉积物中Cu、Pb、Zn、Mn4种重金属的赋存形态,并结合次生相富集系数法,探讨了沉积物中重金属的潜在生态风险及来源。结果表明,沉积物中C
2、u以残渣态为主(高于50%),其次为有机质结合态,从上游至下游,沉积物中Cu形态的稳定程度逐渐增加;沿程所有沉积物样品中可交换态Pb的含量均高于当地沉积物背景值,存在较高的可迁移性和二次释放风险;在二松大部分江段和松花江干流,zn主要以比较稳定的残渣态存在,不存在二次释放污染水体的风险;Mn的有效态含量均在流域沉积物背景值范围之内。对重金属次生相富集系数的研究表明,沿程沉积物中Cu、Pb均有一定程度的富集,主要来源于人为输入;Zn在二松中下游的哈达湾至松原江段有一定的富集,其余江段人为输入的zn较少;沉积物中的Mn主要为自
3、然来源。关键词:松花江;沉积物;重金属;形态;次生相富集系数中图分类号X522:文献标志码:A文章编号:1672—2043(2010)01—0163—05SpeciationofHeavyMetalsinSedimentoftheSonghuaRiver,NortheastofChinaZHANGFeng-yin91,2,3,YANBai-xin91,ZHULi-lul,3(1.NortheastInstituteofGeographyandAgriculturalEcology,CAS,Changchun130012,C
4、hina;2.InstituteofGeographyScienceandNaturalResourceResearch,CAS,Beijing100101,China;3.GraduateUniversityofChineseAcademyofSciences,Beijing100039,China)Abstract:ThechemicalpartitioningofCu,Pb,ZnandMninthesurfacesedimentsofSonghuaRiverweredeterminedbytheTessiersequ
5、en-tialextractionmethod.Thechemicalspeciationcharacteristics,pollutionstateandpotentialecologicaleffectsoftheheavymetalsweredis-cussedcombiningwiththephaseenrichmentfactorsanalysis.TheresultsshowedthatCumainlyexistedinresidualfraction,accountingformorethan50%ofits
6、totalcontent;andtheorganicfractionrankedthesecond.ThestabilityofCuinthedownstreamsedimentswashigherthanthatoftheupstreamsediment.Inallthesedimentsamples,thecontentofexchangeablefractionofPbwashigherthanitsbackgroundvalue,whichwaseasilymobileandcouldbringecological
7、risktothewaterecologicalsystemagain,andshouldbepaidmoreattentionto.ZninmostsedimentofthesecondarySonghuaRiverandtheSonghuaRiverwasmainlyassociatedwiththeresidualfraction,andthenwouldnotpollutetheriverheavily.ThecontentofeffectiveMnwaslowerthanitsbackgroundvalueofM
8、ninSonghuaRiver.Theresultsofphaseenrich-mentfactorsanalysisindicatedthatCuandPbaccumulatedinthesedimenttosomedegree,whileZnpollutionmainlyexistedfromthe
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