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Spectrophotometric DeterminationColorimetric DeterminationHot SpringsAnalytical ChemistryPaper ChromatographyAbsorption SpectraChemical AnalysisSolvent ExtractionAmino AcidsAqueous SolutionCatalytic HydrogenationChemical CompositionOrganic CompoundsThermal DecompositionSpectrochemical AnalysisSubstitution ReactionInfrared SpectraQuantitative AnalysisEffect of PressureUltraviolet Absorption Spectra