Simultaneous determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol by phase-sensitive ac polarography.
Phase-sensitive ac polarography was applied to the simultaneous quantitative determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol in alkaline solutions. Certain experimental precautions are necessary to determine each compound in the presence of the other two. Thus, 4-nitrocatechol is determined indirectly by forming a yellow ratio chelate with cupric ions, wheras 4-nitroansole is determined directly by the reduction waves of the nitro group. For the determination of 4-nitrophenol, the interferency by the simultaneously present 4-nitrocatechol must be eliminated by masking it by the addition of magnesium ions. The method described permits a qualitative and quantitative analysis of all three compounds in one solution since linear calibration curves are obtained.
D000840:Anisoles / Q000032:analysis*; D002396:Catechols / Q000032:analysis*; D003300:Copper; D006863:Hydrogen-Ion Concentration; D008274:Magnesium; D008722:Methods; D009574:Nitro Compounds / Q000032:analysis*; D009596:Nitrophenols / Q000032:analysis*; D011048:Polarography
D000840:Anisoles; D002396:Catechols; D009574:Nitro Compounds; D009596:Nitrophenols; D003300:Copper; C005306:4-nitroanisole; D008274:Magnesium; C001833:4-nitrocatechol