過塩素酸法による配合肥料中の加里簡易定量法に就て

概要

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As a simple and rapid method for determining potash in mixed fertilizer, we have ascertained that a good result can be obtained by the following process with the aid of perchloric acid : - 2.5-5g of the sample are taken into a 250 cc graduated flask with 150 cc of water containing a small quantity of sodium hydroxide and boiled for 30 minutes to expel ammonia. The quantity of sodium hydroxide to be used is sufficient to keep the solution alkaline through the whole course of boiling, using phenolphtalein as indicator. Furthermore, a piece of litmus paper is supported near the top of the flask in order to know exactly the comming out of ammonia of the flask. The solution is then made acidic by adding hydrochloric acid and sulphate are precipitated with Ba-chloride solution. After the complete precipitation the flask is filled up to the mark with water and filtrated. 50 cc of the filtrate are then taken for the determinatin of potash by the perchlorate method as used in the German Potash Industry. The mathod was applied to many samples of various mixed fertilizers containing potash and the results obtained by the method were compared with those obtained by the chloroplatinate method.
社団法人日本土壌肥料学会の論文
1938-02-20