The Analyst · 1980 · 34 citations · 0 references
Direct Blue 84EngineeringCalibration GraphsPolar EnvironmentsChemistryBiological SignificancePhosphorescence ImagingBioanalysisAnalytical ChemistryDyeingBiophysicsBiochemistryAcid Red 73Polarographic BehaviourAzo DyesBiologyNatural SciencesSpectroscopyColorimetryPigment
The polarographic behaviour of the azo dyes CI Direct Orange 34, Acid Red 73, Direct Blue 84 and Direct Red 80 over the pH range 1–13 was studied. Mechanisms of reduction are postulated, the optimum pH ranges for the determination of the dyes by differential-pulse polarography are selected and the appropriate linear ranges deduced from calibration graphs.