The construction of a microdetector, based on the principle of polarography with a dropping mercury electrode, for high speed, high efficiency liquid chromatography in columns is described. Sensitivity, noise, linear dynamic range and speed of response are discussed. The polarographic detector has been applied to the analysis of a mixture of parathion, methyl parathion and p-nitrophenol. Concentrations in the order of 10−8 mol/l can be determined in a few minutes. In quantitative analysis a standard deviation of better than 2% can be obtained.
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Koen et al. (1970) studied this question.