内秦淮河沉积物中重金属的污染特征及吸附与释放规律研究的中期报告.docx

内秦淮河沉积物中重金属的污染特征及吸附与释放规律研究的中期报告
【摘要】
本研究以江苏省南京市内秦淮河沉积物为研究对象，对沉积物中铅、镉、铬等重金属元素的污染特征及其分布规律进行了系统研究。结果显示，内秦淮河沉积物中铅、镉、铬等重金属元素的含量均超过了国家土壤环境质量标准，其中铅的污染最为严重；沉积物中重金属元素的含量呈现出从江心到两岸逐渐减小的趋势，且在沉积物深度方向上也存在一定的变化规律。通过静态吸附实验和动力吸附实验，进一步研究了内秦淮河沉积物对重金属元素的吸附和释放规律。结果表明，沉积物中的有机质对重金属元素的吸附和释放起着关键作用，其吸附和释放过程可以用准二级动力学模型进行描述。
【关键词】内秦淮河；沉积物；重金属污染；吸附与释放规律
【Abstract】
Inthisstudy,thecharacteristicsanddistributionpatternsofheavymetalpollutantssuchaslead,cadmium,andchromiuminthesedimentoftheinnerQinhuaiRiverinNanjing,JiangsuProvinceweresystematicallystudied.Theresultsshowedthatthecontentsofheavymetalelementssuchaslead,cadmium,andchromiuminthesedimentoftheinnerQinhuaiRiverexceededthenationalsoilenvironmentalqualitystandards,amongwhichleadpollutionwasthemostserious.Thecontentofheavymetalelementsinsedimentshowedagradualdecreasefromthemiddleoftherivertobothbanks,andtherewasalsoacertainvariationruleinthedepthdirectionofsediment.TheadsorptionandreleasecharacteristicsofheavymetalelementsinthesedimentoftheinnerQinhuaiRiverwerefurtherstudiedthroughstaticadsorptionexperimentsanddynamicadsorptionexperiments.Theresultsshowedthatorganicmatterinsedimentplayedakeyroleintheadsorptionandreleaseofheavymetalelements,andtheadsorptionandreleaseprocesscouldbedescribedbyaquasi-second-orderkineticmodel.
【Keywords】InnerQinhuaiRiver;Sediment;Heavymetalpollution;Adsorptionandreleasecharacteristics