资源描述：
《文献阅读问题答案》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、文献阅读问题Introduction1・Howdoheavymetalsentrythesoils?Answer:Entiyofsoil-bomemetal(loid)sintothefoodchaindependsontheamountandsourceofmetal(loid)sinput,thepropertiesofthesoil,therateandmagnitudeofuptakebyplants,andtheextentofabsorptionbyanimals.2.Canyougiveadefinitiontoheavymetalandgi
2、veustheexamples?Answer:Thetermheavymetalreferstoanymetallicchemicalelementthathasarelativelyhighdensityandistoxic,highlytoxicorpoisonousatlowconcentrations.Examplesofheavymetalsincludemercury(Hg),cadmium(Cd),arsenic(As),chromium(Cr),thallium(Ti),andlcad(Pb).Historically,heavymetal
3、(loid)stoxicitytohumanhealthreceivedattentionprimarilyasaresultofseriesofwidespreadpoisoning・3.Whyhumankindpaysattentiontoheavymetal(loid)stoxicity?Answer:Historically,heavymetal(loid)stoxicitytohumanhealthreceivedattentionprimarilyasaresultofseriesofwidespreadpoisoning.4.Canyoude
4、scribecharacteristicsofheavymetal(loid)sinsoil?Answer:Unlikeorganiccontaminants,metal(loid)sdonotundergomicrobialorchemicaldegradation,andthetotalconcentrationofthesemetal(loid)spersistforalongtimeaftertheirintroductioninsoils・5.Canyoutellusthedifferencebetweenphytoextractionandph
5、ytostabilization?Answer:Phytoextractionprocessisusedtoremovemetal(loid)sinsoil;phytostabilizationisusedtoimmobilizemetal(loid)sinsoil.Sourcesofheavymetal(loid)s1•Wheredocsheavymetalinthesoilcomefrom?Answer:Heavymetal(loid)sreachthesoilenvironmentthroughbothpedogenicandanthropogeni
6、cprocesses・Dynamicsofheavymetal(loid)sinsoils1.Dometal(loid)ssubjecttovolatilizationlosses?Answer:Althoughmostmctal(loid)sarcnotsubjecttovolatilizationlosses,somemetal(loid)ssuchasAs,Hg,andSetendtoformgaseouscompounds]・2.Pleasetellthedifferencebetweenspecificadsorptionandnon-speci
7、ficadsorption.Answer:Ingeneralterms,non-specificadsorptionisaprocessinwhichthechargeontheionsbalancesthechargeonthesoilparticlesthroughelectrostaticattraction,whereasspecificadsorptioninvolveschemicalbondformationbetweentheionsinthesolutionandthoseinthesoilsurface・3.Pleasetellusth
8、erelationshipbetweenbioavailabili
