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时间:2020-03-25
《我国污灌污水中重金属含量特征及年代变化规律.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2011,30(1I):2271—2278JournalofAgro—EnvironmentScience我国污灌污水中重金属含量特征及年代变化规律辛术贞,李花粉,苏德纯+(中国农业大学资源与环境学院,北京100193)摘要:通过杳阅文献数据库,统计发表的我国各地污灌污水中的重金属含量,并对数据进行统计分析,总结近30a来我国污灌污水中重金属的含量特征及年代变化规律。文献数据统计结果表明,近30a来我闲污灌污水中重金属Pb、cr、zn、Ni的含量均值或中位值随年代逐步降低,Hg、As平均含量呈先上升后
2、下降的趋势,cu、cd平均含量则是呈现先下降后上升的趋势;近30a来污灌污水中8种重金属浓度的平均值或中位值均低于农}}I灌溉水质标准(GB5084--2005),但污灌污水中重金属浓度的90%分位值均超过该农田灌溉水质标准,污灌污水中重金属浓度75%Y)-位值20世纪80年代Hg、Pb、cd超标,90年代Hg、Cr、As超标,近10aCd、As超标。对污灌污水中Hg、Cd、As在污染源头控制中需要优先控制。关键词:污灌污水;重金属;含量特征;年代变化中图分类号:X832文献标志码:A文章编号:1672—2043(2
3、011)11-2271—08ConcentrationCharacteristicsandHistoricalChangesofHeavyMetalsinIrrigationSewageinChinaXINShu—zhen,UHua—fen,SUDe—chun‘(CollegeofResourcesandEnvironmentalSciences,ChinaAgriculturalUniversity,Beijing100193,China)Abstract:Sewageirrigationisoneofthemai
4、nfactorswhichcouldcausecontaminationofheavymetalsinthefarmland.Inthisstudy,Wecol-lectedthepublisheddataconcerningtheconcentrationsofheavymetalsinirrigationsewagealloverthecountryfromliteraturedatabases,thenanalyzedallthedataandsummarizedtheconcentrationcharacte
5、risticofheavymetalsandtheirhistoricalchangesinthepast30years.TheresultsshowedthatthemeanormedianvaluesofPb,Cr,Zn,Niconcentrationsintheirrigationsewagedecreasedgraduallywiththeageinthelastthreedecades.ThemeanconcentrationsofHgandAsincreasedfirstlyanddecreasedthe
6、n,however,themeanconcentrationsofCuandCddecreasedatthebeginningandincreasedafterwards.Themeanconcentrationsoftheeightheavymetalswerealllowerthanthestandardsprescribedin“Standardsforirrigationwaterquality”(GB5084--2005)innearlythreedecades,butabout10%ofheavymeta
7、lsconcentrationswerehigherthanthisstandard.About25%ofHg,Pb,Cdconcentrationsin198伊一1989werehigherthanthestandard,25%ofHg.Cr,Asconcentrationsin1990_一1999alsohigherthanthestandardandthesameas25%ofCdandAsconcentrationsin200m一2009.Insummary,Hg,CdandAsshouldbeconside
8、redasapriorityinpollutionsourcecontrolofheavymetalsinirrigationsewage.Keywords:irrigationsewage;heavymetal;concentrationcharacteristic;historicalchanges水资源是人类生存和经济社会发展的物质基础,
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