化成肥料の水溶性加里定量法に就て

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This paper deals with methods for the determination of water-soluble potassium in some compound fertilizers which I have recently obtained. Three methods - boiling, washing, shaking with water, - were applied to the determination of these samples and the results of analyses showed remarkable differences among them. While the differences between the washing method and shaking method were hardly acknowledged, the results of the boiling method were gained considerably less than the other two methods. After various experiments I confirmed that the differences were chiefly due to the following two factors. 1) The occlusion of the water-soluble potassium in the precipitate of gypsum which was formed by boiling the sample solution. 2) The formation of the double salt, potassium calcium sulphate (syngenite) according to boiling the sample solution.
社団法人日本土壌肥料学会の論文
1935-09-20