欢迎来到天天文库
浏览记录
ID:52404657
大小:448.85 KB
页数:8页
时间:2020-03-27
《北京东南郊再生水灌区土壤PAHs污染特征.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(4):666—673JournalofAgro—EnvironmentScience北京东南郊再生水灌区土壤PAHs污染特征何江涛,金爱芳,陈素暖,魏永霞(中国地质大学(JL京)水资源与环境学院,北京100083)摘要:采用Eijkelkamp土壤采样器对北京东南郊再生水灌区进行了3个钻孔剖面采样,同时采集了灌溉用水及地下水样品,并采用气相色谱一质谱联用仪对16种多环芳烃(PAHs)进行定量分析。结果表明,表层土壤中有14种PAHs检出,浓度在0.4~53.1斗g
2、·kg。之间,PAHs平均含量为206.7Ixg·kg~,达到了土壤污染临界值;表层以下PAHs的检出种类和含量显著减少,以中、低环的萘、菲、芴、荧蒽、芘为主,Y
3、,PAHs仅占表层的3.8%~12.0%,从剖面PAHs含量变化可以判断,低环PAHs较易迁移,迁移性强弱顺序为萘、芴>菲>芘、荧蒽;污灌区表土中PAHs组成与大气降尘接近,但与再生灌区有明显差异,这种差异主要由于灌溉用水不同所造成;再生水灌区表土以下土壤剖面检出的PAHs与再生水中的PAHs一致,说明再生水灌溉是导致土壤剖面PAHs
4、污染的主要原因,同时地下水中检出的PAHs种类也与土壤剖面基本一致,但含量较高,可能是早期污水灌溉所造成。关键词:再生水灌溉;多环芳烃;垂向剖面;污染特征中图分类号:X53文献标志码:A文章编号:1672—2043(2010)04—0666—08DistributionCharacteristicsofSoilPAHsinReclaimedWaterIrrigationAreaintheSoutheasternSuburbofBeijingHEJiang—tao,JINAi-fang,CHENS
5、u-nuan,WEIYong—xia(SchoolofWaterResourcesandEnvironment,ChinaUniversityofGeosciences,Beijing100083,China)Abstract:Samplesofsoils,groundwaterandreclaimedwaterwerecollectedfromthereclaimedwaterirrigationareainthesoutheasternareaofBeijing.Thesoilsamples
6、werecollectedfromthreeboreholeprofilesbyEijkelkampsoilsampler.TheresultsofGC—MSanalysesshowedthat14PAHsweredetectedinthetopsoilsandtheirconcentrationwasinarangeof0.4to53.1Ixg·kg.TheaveragetotalcontentofPAHsinthetopsoilwas206.7斗g·kg,whichisverycloseto
7、thecontaminationthresholdofsoilproposedbyMaliszewska—Kordybach.Belowthetop—soil.bothspeciesandcontentsofdetectedPAHsdropveryfast.Only2to4-ringPAHs(i.e.,naphthalene,fluorene,phenanthrene,fluoran—theneandDvrene)weredetectedandthetotalcontentPAHswasonly
8、3.8%~12.0%of山atintlletopsoil.ThecontentdistributionofPAHsinthesoilprofilesindicatedthatPAHswithlessringswereeasiertomigratethanthePAHswithnlorerings.Thesequenceofthemigrationca—pabilitiesfromstrongtoweakwasnaphthalene,fluorene>phenanthrene>fluoranthe
9、ne,pyrene.ThedetectedPAHscomponentsintopsoilsinwastewaterirrigationareawerequitesanletothoseofthedustfall,butdifferentfromthoseinthetopsoilofthereclaimedwaterirrigationarea.Thedifferencewasmainlycausedbytlleditierenceoftheirrigationwaters.However,tll
此文档下载收益归作者所有