Domov technika Quantitative

Quantitative



Definition

QuantitativeAnattributereferstoanattributethatexistsintheformofaquantityandcanthereforebemeasured.Theresultofthemeasurementisexpressedbytheproductofaspecificquantity(calledaunit)andanumber.Takingphysicalquantitiesasanexample,distance,quality,andtimeareallquantitativeattributes.Manyattributesexaminedinsocialsciences,suchasability,personalitycharacteristics,etc.,arealsoregardedasquantitativeattributesforresearch.

Quantitativeanalysis

Theanalyticalmethodthatneedstodeterminetherelativecontentofeachcomponentinasubstance(compound)isquantitativeanalysis.

Generally,itisnecessarytoperformqualitativeanalysisfirsttodeterminethematerialcomposition,andthenselecttheappropriateanalysismethodforquantitativeanalysis,becausetherearedifferenteffectiveanalysismethodsfordifferentcomponentelementsorions.Whetheritcontainsinterferingionsorelementsisalsoafactortobeconsideredwhenchoosingananalysismethod.Sincequantitativeanalysiscandeterminethecontentofcomponents,ithasverygreatpracticalapplicationsignificance.

Qualitativeanalysis

Themaintaskofqualitativeanalysisistodeterminethecompositionofthesubstance(compound).Onlyafterthecompositionofthesubstanceisdetermined,cantheappropriateanalysisbeselectedThemethodperformsquantitativeanalysis.Ifitisonlytodetecttheexistenceofacertainionorelement,itisaseparateanalysis;ifaseriesofreactionsarerequiredtoremoveotherinterferingionsorelementsoritisrequiredtoknowwhichotherionsorelementsexist,itisasystematicanalysis.

Qualitativeanalysisincludeschromatography.

Accordingtothetypeofsubstance,qualitativeanalysisisdividedintoqualitativeinorganicanalysisandqualitativeorganicanalysis.

See

  • Quantitativeanalysis

  • Qualitativeandqualitativeanalysis

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