应用化学专业英语 教学课件 作者 黄忠 谢普会 付颖 主编lesson 12 introduction to analytical chemistry.ppt

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1、Lesson12IntroductiontoanalyticalchemistryIntroductiontoChemicalAnalysisChemicalanalysisincludesanyaspectofthechemicalcharacterizationofasamplematerial.AnalyticalChemistry?“ScienceofChemicalMeasurements”AreasofChemicalAnalysisandQuestionsTheyAnswerQuantitation:Howmuchof

2、substanceXisinthesample?Detection:DoesthesamplecontainsubstanceX?Identification:Whatistheidentityofthesubstanceinthesample?Separation:Howcanthespeciesofinterestbeseparatedfromthesamplematrixforbetterquantitationandidentification?WhatdoChemicalAnalystDo?Analyst:Appliesk

3、nownmeasurementtechniquestowelldefinedcompositionalorcharacterizationquestions.ResearchAnalyticalChemistWhatdoChemicalAnalystDo?SeniorAnalyst:Developsnewmeasurementmethodsonexistingprinciplestosolvenewanalysisproblems.WhatdoChemicalAnalystDo?ResearchAnalyticalChemist:C

4、reatesand/orinvestigatesnoveltechniquesorprinciplesforchemicalmeasurements.orConductsfundamentalstudiesofchemical/physicalphenomenaunderlyingchemicalmeasurements.WhatisAnalyticalScience?AnalyticalChemistryprovidesthemethodsandtoolsneededforinsightintoourmaterialworld…f

5、oransweringfourbasicquestionsaboutamaterialsample?What?Where?Howmuch?Whatarrangement,structureorform?Fresenius’J.Anal.Chem.343(1992):812-813©GaryChristian,AnalyticalChemistry,6thEd.(Wiley)Qualitativeanalysisiswhat.Quantitativeanalysisishowmuch.Fig.1.1.Stepsinananalysis

6、Ananalysisinvolvesseveralstepsandoperationswhichdependon:theparticularproblemyourexpertisetheapparatusorequipmentavailable.Theanalystshouldbeinvolvedineverystep.©GaryChristian,AnalyticalChemistry,6thEd.(Wiley)Differentmethodsprovidearangeofprecision,sensitivity,selecti

7、vity,andspeedcapabilities.©GaryChristian,AnalyticalChemistry,6thEd.(Wiley)Thesamplesizedictateswhatmeasurementtechniquescanbeused.©GaryChristian,AnalyticalChemistry,6thEd.(Wiley)TrainingofChemicalAnalysts(AnalyticalChemists)Trainingfocusesonprinciplesandtechniquesforso

8、lvingmeasurementproblems…but…ChemicalanalystsinterfacemultipledisciplinestothesolutionofchemicalmeasurementproblemsPh