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Recent experiments in this Laboratory have shown that it is relatively easy to attain 100% current efficiency in the electrolytic reduction of various metal ions,1 and certain organic compounds,3 when the electrolysis is performed with a mercury cathode whose potential is controlled precisely These results suggested the possibility of basing an electroanalytieal method on the measurement of the quantity of electricity that must be passed through an electrolysis cell to achieve quantitative reaction at one of the elec-( 1)

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A new method for determination of manganese is based on the potentiometric titration of manganous ion with permanganate ion in neutral pyrophosphate solution. The method is applicable without any separations to a wide variety of manganiferous metallurgical products, and it yields very accurate results.

Studies on the Dropping Mercury Electrode 825 Table VI Reacting base Acetylethylenediamine Propionylethylenediamine Benzoylethylenediamine 2-Phenyl-4,5-dihydroimidazole ^-Toluylethylenediamine 2-£-Tolyl-4,5-dihydroimidazole Phenyl Ureas'* Phenylureido derivative l-Acetyl-2-phenylcarbonamidoethylenediamine l-Propionyl-2-phenylcarbonamidoethylenediamine 1-Benzoyl-2-phenylcarbonamidoethylenediamine 2-Phenyl-3-phenylcarbonamido-4,5-dihydroimidazole 1-^-Toluyl-2-phenylcarbonamidoethylenediamine 2-^-Tolyl-3-phenylcarbonamido-4,5-dihydroimidazoie M. p" °C. % N Kjeldahl corr.

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