Control of Salt Concentration of Soil Solution by the Addition of Synthetic Hydrotalcite
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概要
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Hydrotalcite(HT)is a unique Mg-Al hydroxide mineral having excess surface positive charge. Because of its high selectivity for carbonate ion, the positive surface charge is mostly neutralized by adsorbing carbonate ion under CO_2 containing atmosphere. Since the adsorbed carbonate is essentially exchangeable, anion exchange reactiorns with other anions, e.g.nitrate, [numerical formula]Y_2CO_3+2NO_3^-=2YNO_3+CO_3^<2-> (1) take place depending on the concentrations of nitrate and carbonate in the milieu. In Eq.1, Y is a fraction of HT carrying a unit positive charge. If the coexisting cation is calcium the reaction in Eq.1 will advance to a larger extent because of the elimination of released carbonate as calcium carbonate and, as a result, the salt concentration in a bathing solution will decrease. [numerical formula]Y_2CO_3+Ca^<2+>+2NO_3^-=2YNO_3+CaCO_3(S). (2) Major ions dissolved in soil solutions of many greenhouse soils are calcium and nitrate with accompanying magnesium, potassium, sodium, sulfate, and chloride(Okajima 1981). The salt concentration in greenhouses occasionally exceeds 0.2mol(+)L^<-1> due to intensive fertilizer application and absence of precipitation(Okajima 1981). These facts and the anion exchange properties of HT briefly described above lead to the idea that HT incorporated to greenhouse soils may function as a salt-buffer. In this study, we carried out model experiments to examine the effect of HT addition on the salt concentration of the soil solution.
- 一般社団法人日本土壌肥料学会の論文
著者
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Wada Shin-ichiro
Department Of Agricultural Chemistry
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Masuda Kinya
Department of Agricultural Chemistry, Kyushu University
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Masuda Kinya
Department Of Agricultural Chemistry Kyushu University:(present Address)hokkaido Agricultural Experimental Station
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