A Rapid and Sensitive Method for On-Site Estimation of Small Amount of Carbonate in Soils
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I developed a simple, rapid, and sensitive method for the estimation of a small amount of carbonate in soils. An air-tight plastic bag containing soil sample is first evacuated, then filled with a definite volume of air followed by the addition of 2 mol L^<-1> HCl via an attached rubber septum by using a plastic syringe. After about 20 min, the CO_2 concentration of the air inside of the bag is determined by a CO_2-detector tube. The amount of CO_2 released from the soil sample is calculated by adding the amount of CO_2 in the air-phase and that dissolved in the aqueous phase, the latter of which is calculated with the aid of the Henry's law and the CO_2 concentration of the air in the bag. The method gave quantitative results with standard CaCO_3-quartz powder mixtures. The results for fifteen Ap soil samples agreed with those by the microdiffusion method.
- 一般社団法人日本土壌肥料学会の論文
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