预览加载中，请您耐心等待几秒...

两种消解方法对测定沉积物中重金属含量的比较研究.docx

预览
1/3
2/3
3/3

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

两种消解方法对测定沉积物中重金属含量的比较研究 Title:ComparativeStudyonTwoDissolutionMethodsfortheDeterminationofHeavyMetalContentinSediments Introduction: Sedimentsareessentialpartsofaquaticecosystems,astheyserveassinksforvarioussubstances,includingheavymetals.Heavymetals,suchaslead(Pb),cadmium(Cd),andmercury(Hg),areofgreatconcernduetotheirtoxicityandpotentialtoaccumulateintheenvironment.Therefore,accuratedeterminationofheavymetalcontentinsedimentsiscrucialforassessingenvironmentalpollutionandpotentialrisks.Thisstudyaimstocompareandevaluatetwocommonlyuseddissolutionmethodsforanalyzingheavymetalcontentsinsediments. Methodology: Twodissolutionmethods,namely,aciddigestionandsequentialextraction,wereemployedtoanalyzetheheavymetalcontentinsedimentsamples.Aciddigestioninvolvedthetotaldissolutionofthesedimentsamplesusingstrongacids,whilesequentialextractionanalyzedtheheavymetals'mobilizationunderdifferentchemicalenvironmentssimulatingnaturalprocesses.Theexperimentutilizedrepresentativesedimentsamplescollectedfromvariouswaterbodies,includingrivers,lakes,oroceans,withknownorsuspectedheavymetalcontamination. ResultsandDiscussion: 1.AcidDigestionMethod: Aciddigestionisawidelyusedanalyticaltechniquethataimstodissolveallmetalspresentinthesediments.Thesedimentsamplesweresubjectedtoastrongacidmixture,suchasaquaregiaoracombinationofconcentratednitricandhydrochloricacid.Thismethodprovidesasinglemeasurementrepresentingthetotalconcentrationofheavymetalsinsediments.However,itisessentialtoconsiderthataciddissolutionmayalsoreleasemetalsboundtoorganicmatterormineralsthatarenotbioavailable.Theaciddigestionmethod'sresultswerecomparedwiththesequentialextractionmethodtoassessitsreliabilityandaccuracy. 2.SequentialExtractionMethod: Thesequentialextractionmethodinvolvesaseriesofchemicalextractionssimulatingdifferentenvironmentalconditions,suchastheexchangeable,carbonate-bound,ironandmanganeseoxide-bound,organicmatter-bound,andresidualfractions.Eachfractionrepresentsthepotentialbioavailabilityofheavymetalsunderdiffer