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ID:49921481
大小:1.43 MB
页数:8页
时间:2020-03-05
《污灌区土壤中多环芳烃的垂直分布及可能来源_姚林林.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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