欢迎来到天天文库
浏览记录
ID:36560735
大小:3.98 MB
页数:124页
时间:2019-05-12
《辽宁地区土壤中多环芳烃的污染特征、来源及致癌风险》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、大连理工大学博士学位论文辽宁地区土壤中多环芳烃的污染特征、来源及致癌风险姓名:王震申请学位级别:博士专业:环境工程指导教师:陈景文20070801辽宁地区土壤中多环芳烃的污染特征、来源及致癌风险以大连地区为例,应用概率致癌风险评价的方法分析了土壤中PAl-Is对人体的致癌风险。对三种直接接触途径,皮肤接触私吞食土壤的累计概率为90%的终生致癌风险(ILCR)超过1矿,表明会对人体造成潜在的致癌风险,而呼吸土壤颗粒物的累计概率为90%的ILCRJ远小于1旷,表明因呼吸土壤颗粒物而引起的致癌风险可以忽略。并且由于生
2、理特征和生活习惯的差异,不同年龄段的人群0h童、青年和成年人)对不同接触方式导致的尼CRs有所不同。通过对不确定性的灵敏度分析,发现对致癌风险评价结果影响最大的是土壤中PAHs的基于BaP的当量浓度和暴露于土壤的皮肤面积的比例。该结果表明,若要降低致癌风险评价中的不确定性,首先应降低PAHs当量浓度的不确定性。关键词:多环芳烃;土壤;非负约束因子分析;概率致癌风险评价;源解析;大连Ⅱ大连理工大学博士学位论文RegionalstudyonsoilpolycyclicaromatichydrocarbonsinLi
3、aoning:patterns,sourcesandcancerrisksAbstractPolycycliearomatichydrocarbons(PAHs),agroupofubiquitouspersistenttoxicsubstancespossessingcarcinogenic,mumgenieandimmunotoxicproperties,havebecomeanissueofin.easingconceminrecentdecades.PAHsaremainlyoriginatedfrom
4、incompletecombustionoffossilfuelandbiomass.PAllstendtobestronglyadsorbedtosoilandaredifficulttodissipateowingtotheirhighoctonal·waterpartitioncoefficients.Duetoitshi曲storagecapacity,soiliscomideredasamajorenvironmentalreservoirforPAHs.Liaoningprovinceisoneof
5、typicaltraditionalindustrialbasesinChina.Overthelastcentury,increasesinpopulationandindustryintheregionhaveresultedinhi曲consumptionoffuel.Inaddition,biomaasbumingisatraditionalpracticeforheatingandcookinginruralareas.Thus,itisexpectedthatLiaoningsufferedfrom
6、severePAHspollution.However,thestudiesonPAHsinthisareaareverylimited.SotheinvestigationonPAHlevelsinsoilsisveryimportanttounderstandthespatialdistribution,sources,characterofcompositionofPAHsandrisksontheecologicalandhumanhealth.ThelevelsanddistributionsofPA
7、HsinDaliansoilswereinvestigated.ThePAHconcentrationswerehi曲and/orcomparable、】I,ithotherregiOIlS.SoilPAHconcentrationsshowedanurban‘。suburban‘。ruralgradient,withtotalconcentrationsupto30timeshigherintheurbanareasthanthoseintheruralareas.PAHswith4-ringweredomi
8、natedintheurbansoils.while3-ringPAl-Isintheruralareas.ThecompositionprofilesofPAHsalsodisplayedtheurban—suburban—ruralgradientowingtotheirdifferenttransportpotential.Thecrossplotsofselecteddiagn
此文档下载收益归作者所有