希硫酸のpH及び導電率の土壌添加による変化とその土壌の酸中和容量測定への応用

概要

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The soil, collected from 10 points in Japan, was crushed to powder after air-drying at room temperature. The soil sample, 0.3g each, was added to titrate a 150ml of dilute sulfuric acid solution (pH 3.00). After the mixture was stirred for 1 minute and left for 9 minutes, its pH and conductivity were measured on upper part of the supernatant to make soil-pH and soil-conductivity titration curves. Usually 6g of soil was used in total by dividing into 20 fractions to make a titration curve. These titration curves of a soil sample gave one inflection point at a similar amount of soil added. Because the inflection point in the conductometric titration curve was much clear than that of pH, the former was used to determine the equivalent point for the neutralization of dilute sulfuric acid solution by soil samples. From the amounts of soil added and hydrogen ion consumed until the inflection point, acid neutralization capacity (ANC) was calculated for each soil sample. The values of ANC were compared with soil pH measured in de-ionized water and 1mol dm^<-3> potassium chloride in this work.
崇城大学の論文