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Natural SciencesChemistryAnalytical ChemistryElemental AnalysisSpectroscopyElectrolyte AnalysisEmission SpectroscopyInstrumental AnalysisMineral AnalysisTrace Element AnalysisEmission Spectral AnalysisMineral Content DeterminationPotassium AnalysisQuantitative DeterminationUrinary Electrolyte AnalysisUrinary Sodium ExcretionUrine Electrolytes