北京东南郊再生水灌区土壤PAHs污染特征.pdf

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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