Simultaneous Polarographic Determination of a System of o-Nitroanisole, o-Chloronitrobenzene and o-Nitrophenol

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1) The solution of o-nitroanisole, o-chloronitrobenzene and o-nitrophenol is investigated polarographically with the intention of their simultaneous determination. 2) The most suitable supporting electrolyte solution for the above object is the mixture of 4 parts of 1 N sodium hydroxide and 1 part of methanol. 3) Although this solution is not buffered, the variation of concentration of one component does not exert appreciable influence upon the wave-heights and the relative positions of the waves of other two components. 4) o-Nitrophenol can be determined directly from the ordinary polarogram. The accuracy of determination is under ±10%. 5) The residual current compensation gives aid to the determination of o-nitroanisole and o-chloronitrobenzene. By passing the compensating current very excessively, their reduction waves become better defined. The accuracy of determination is +8∼－17% for o-nitroanisole and －24∼－9% for o-chloronitrobenzene. 6) The half-wave potentials of three compounds, 5×10－4 M/l. in 1 N sodium hydroxidemethanol (4:1) solution are as follows; (Remark: Graphics omitted.) These values would give some indications for the estimation of the separation of waves.
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