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时间:2020-04-25
《南淝河不同排口表层沉积物DOM光谱特征-论文.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、中国环境科学2014,34(9):2351~2361ChinaEnvironmentalScience南淝河不同排口表层沉积物DOM光谱特征沈烁,王育来,杨长明,杨殿海(同济大学,教育部长江水环境重点实验室,上海200092)摘要:在南淝河15个排口采集了表层沉积物样品,在测定了其中溶解性有机碳(SDOc)含量的同时,采用紫外一可见吸收光谱和三维荧光光谱分析方法,并结合PARAFAC模型对沉积物中溶解性有机质(DOM)的荧光组分和来源进行了解析.结果表明:南淝河不同排口表层沉积物SDOC的含量在0.28~0.95gg之间,平均为0.63g/kg;~样点沉积物SDOC明显高于
2、其他河段,特别是靠近污水厂尾水排放口沉积物SDOC明显高于其他采样点.南淝河沉积物紫外可见光吸收系数a可以很好表征沉积物DOM含量相对大小,而光谱斜率&75295和光谱斜率比SR反映出各采样点沉积物DOM中自生源组分的差异;利用PARAFAC模型解析出DOM四种荧光组分,其中较老的自生源腐殖质C2和新近类蛋白C4所占比例高.南淝河不同排口沉积物DOM自生源组分比例存在显著差异,其中老城区排口沉积物DOM以自生源组分为主,而上游排口沉积物DOM陆源组分所占比例较高,雨污排口和污水,一尾水排口虽以自生源为主,但陆源的贡献不可忽略.结果表明,光谱分析方法能够有效表征城市河道不同排
3、口污染源强.关键词:南淝河;污水排口;表层沉积物;溶解性有机质(DOM);紫外一可见吸收光谱:三维荧光光谱中圈分类号:X131文献标识码:A文章编号:1000—6923(2014)09~235卜t1Spectralcharacteristicofdissolvedorganicmatter(DOM)inthesurfacesedimentsfromdifferentdischargingpointsalongtheNan~iRiverinHefeiCitY,AnhuiProvince.SHENShuo,WANGYu—lai,YANGChang—ming’,YANGDian-
4、hai(KeyLaboratoryofYangtzeWaterEnvironmentofMinistryofEducation,Ton~iUniversity,Shanghai200092,China).ChinaEnvironmentalScience,2014,34(9):2351~2361Abstract:Thesurfacesedimentssampleswerecollectedfrom15dischargepOnsofNanfeiRiver,anurbanriverinHefei.AnhuiProvince.Thefluorescencecomponentsan
5、dthesourcesofdissolvedorganicmatter(DOM)insedimentswereanalyzedbytheusesofdissolvedorganiccarbon(SDoc)measurement,ultraviolet—visibleabsorptionspectrum,andthree-dimensionalexcitationemissionmatrixfluorescencespectroscopy(3D—EEM)combinedwithparallelfactoranalysis(PARAFCT).Theresultsshowedth
6、atthecontentsofSDOCrangedfromO.28to0.95g/kgwiththeaverageof0.63g/kg.ThecontentsofSDOCintheoldtownwereobservedsignificantlyhigherthanothers.especiallyforthedischargingportsnearsewageplantefluents.ItwasfoundthattheUV-Visibleabsorptioncoeficient()reflectedwelltherelativequantityofDOMextracted
7、fromthesediments.Thespectralslop(53andthespectralsloperatio()couldbeusedtodistinguishthedifferenceinchemicalcompositionofsedimentDOMfromdifferentdischargingports.Further3D—EEManalysisandPARAFACmodestudiesrevealedthattherewerefourfluorescencecomponents,andtheau
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