Control of salt concentration of soil solution by the addition of synthetic hydrotalcite

Shin-Ichiro Wada, Kinya Masuda, Kinya Masuda

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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 CO2containing atmosphere. Since the adsorbed carbonate is essentially exchangeable, anion exchange reactions with other anions, e.g. nitrate, Y2CO3+2NO3-= 2YNO3+ CO3 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.

Original languageEnglish
Pages (from-to)377-381
Number of pages5
JournalSoil Science and Plant Nutrition
Issue number2
Publication statusPublished - Jan 1 1995


All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

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