ポーラログラフの肥料分析への応用(第一報, 第二報)

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Of late, manganese has used as fertilizers. Both the volumetric and the gravimetric method of the determination of manganese in the separation of Mn and Fe need the double and triple precipitation. So we studied the method that mangane is measured polarographically with the separation of iron, and manganese in fertilizers was possible to estimate in 0.2 n KCN. This method is rapid in time and simple in process and accueate. 1) E.T. Vertier ; Anodic oxidation of Mn-tartratete and its analytical application. Collection, 11 (1939) 233. 2) E.T. Vertier ; The electrodeposition of Mn from Cyanide solutions, Collection, 11(1939), 216. On the determination of iron by polarograph, fluoride, mannitol, complex cyanides, thiocyanate, citric acid, tartaric acid, oxalic acid, etc. have been examined. And although oxalic acid is most ideal of all on the form of the wave, it precipitates calcium in phosphate rocks. On this point malonic acid COOHCH_2COOH does not precipitate it and the form of its wave is as ideal as oxalic acid. So malonic acid was examined on the determination of iron in phosphate rocks and a desirable result was brought. 5c.c. of the solution of a calculated phosphate rocks decomposed with aqua regia is brought into 25c.c measuring flask and diluted to the mark with 1 mol malonic acid-solution neutralized with KOH to pH ca. 5.0 and the cathodic wave from ferric complex to ferrous was measured polarographically in comparison with it of a known iron solution, the content of iron in phosphte rocks was determined directly. This method is rapid in time and simple in process and small in error in comparison with gravimteric or volumetric procedures. With small percentages of iron, the method is inherently accurate and also it is able to determine each of ferric and ferrous ion at the same time.
社団法人日本土壌肥料学会の論文
1950-03-31

ポーラログラフの肥料分析への応用(第一報, 第二報)

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