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ID:52393739
大小:1.77 MB
页数:13页
时间:2020-04-05
《英语阅读选题作业.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、HeavyMetalPollutionContentsAddYourTextinhereMainFeaturesClassificationanddamageTreatmentsandoutlookFundamentalDefinitionContentsIntroductionPb------lead-----铅Cd------cadmium------镉Cu------copper-------铜Hg-----mercury-------汞Zn------zinc-------锌Cr------chromium----铬FundamentalDefinit
2、iontheproportionofheavymetalisbiggerthan5,suchasLead(Pb),cadmium(Cd),mercury(Hg)andsoonHeavymetalpollutionisoneofthemainpollutionsoftheenvironmentwhichiscausedbyheavymetalsandheavymetalcompoundsWhatistheheavymetal?heavymetalpollutionirreversibleenrichmentdangerItishardtodegradationi
3、ntheenvironmentTheharmofhumanbodyisgreatitisuselesstotreatfrompollutedsoilMainFeaturesairpollutionsoilpollutionwaterpollution.ClassificationTherearethreemainfieldofpollutioncausedbyheavymetal:airpollutionStatisticsreleasedbyWHOshowsthatmorethan2millionpeopledeadoftheairpollutioneach
4、yeararoundtheworld.Ithinkallofuscan`tforgetthe“Vulture'sdeath”causedbytheLosAngelessmogoccurredinthe1940sinAmerica.waterpollutionSomecompaniesdischargethewastewatercontainingheavymetaltotheriver,thisisawaringsignorconsequenceofsomeunderlyingeffects.Somefisheslivedinwaterwillabsorbth
5、ose,thenpeoplewhoeatthosefoodwillpoisoningTheincidenthappenedinJapan,peopleatepollutedfishescauseofMinamatadiseasesoilpollutionIfpersoncultivatecropsonthoseground,thosemetalwillbeabsorbedbycrops.Thosecropsalwaysbeusedforfood,sowhenpeopleeatthosemoreorlessheavymetalaccumulatinginthei
6、rbody.cadmium(Cd)riceeventasurveyshowed44%ricewhichcontentheavymetalinguangzhouSuchasItai-itaidiseaseisconsequenceofCadmiumpoisoningsoilpollutionIfsomeBrandscontainheavymetalsTreatmentsandoutlookInviewofthehugedamagescausedbyheavymetalpollution.wearesupposedtoappealtopeopletodrivepr
7、ivatecaraslittleaspossibleOneisthemicrobialorphysicaladsorption,anotherischemicaldegradation,andalsophytoremediationisabettermethodtoimprovethesoilBesidesgovernmentshouldalsotakesomemeasurestoimprovethequalityofenvironmentThankYou!
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