污灌区土壤中多环芳烃的垂直分布及可能来源_姚林林.pdf

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1、第34卷第4期环境科学Vol．34，No．42013年4月ENVIRONMENTALSCIENCEApr．，2013污灌区土壤中多环芳烃的垂直分布及可能来源*姚林林，张彩香，李佳乐，廖小平，王焰新(中国地质大学(武汉)环境学院，武汉430074)摘要:用气相色谱-质谱联用(GC/MS)的方法分析太原市小店污灌区9个土壤剖面中16种多环芳烃(PAHs)含量及垂直分布特征．结果表明，小店污灌区表层土(0～10cm)中PAHs平均含量变化趋势为背景区＜沼泽区＜清灌区＜污灌区;大部分剖面土中PAHs含量随土层深度增加呈减少趋势，PAHs含量变化幅度较大的位置集中在地表以下0～40c

2、m范围内;高环(4～6环)PAHs大量富集在距地表0～50cm土壤内，清灌区土壤对4～6环PAHs的富集能力强于污灌区;不同环数PAHs与TOC和砂粒呈正相关关系(rmax=0.791，P=0;rmax=0.882，P=0)，与pH呈负相关关系(rmin=－0.1，P=0.702);距地表0～40cm范围内的土壤中PAHs的主要污染来源为小店区煤的燃烧;燃烧产生PAHs的污染途径一是直接沉降至土壤中，二是沉降至水体中，吸附在固体颗粒表面，随着灌溉污水流动而在土壤中大量富集．关键词:多环芳烃;剖面土;污灌区;垂直分布;理化性质;可能来源中图分类号:X53文献标识码:A文章编号

3、:0250-3301(2013)04-1553-08VerticalDistributionandPossibleSourcesofPolycyclicAromaticHydrocarboninSewageAreaSoilYAOLin-lin，ZHANGCai-xiang，LIJia-le，LIAOXiao-ping，WANGYan-xin(SchoolofEnvironmentalStudies，ChinaUniversityofGeosciences，Wuhan430074，China)Abstract:Nineprofilesoilsampleswerecollect

4、edfromXiaodiansewageirrigationarea，Taiyuancity，China．Theconcentrationsof16polycyclicaromatichydrocarbons(PAHs)wereanalyzedbygaschromatographyequippedwithamassspectrometrydetector(GC/MS)．TherankorderoftheaverageconcentrationsofPAHsinthe0-10cmuppersoillayerwasbackgroundarea＜swamparea＜groundw

5、aterirrigationarea＜sewageirrigationarea．TheconcentrationsofPAHsinmostprofilesoilsdecreasedwiththeincreaseofdepth，andthePAHsweremainlyaccumulatedinthesurfacesoillayer(0-40cm)．4-6ringsofPAHsweremainlyaccumulatedinthe0-50cmsoillayer，andtheaccumulationcapacityingroundwater-irrigationareawasbet

6、terthanthatinsewageirrigationarea．ThecorrelationbetweendifferentringsofPAHsandTOCwaspositive(rmax=0.791，P=0)，andthesamesituationwasfoundforPAHsandsand(rmax=0.882，P=0)．ThecorrelationbetweenPAHsandpHwasnegative(rmin=－0.1，P=0.702)．ThemainsourceofPAHsinthesurfacesoillayer(0-40cm)ofstudyareawas

7、coalcombustion．ThereweretwopollutionwaysofPAHsinsoil，onewassettledintosoildirectly，theotherwasfirstsettledintowaterandabsorbedonthesurfaceofsolidparticles，andthengotenrichmentinsoilasirrigationwaterflew．Keywords:polycyclicaromatichydrocarbons(PAHs);profilesoil