The Effect of Organic Compounds on Si Concentration in Soil Solution - the Comparision of Poly(N-vinylpyrrolidone) and N-methyl-2-pyrrolidone -

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  • ETOU Mayumi
    Department of Chemistry, Faculty of Science, Kyushu University
  • NISHIDA Ikuko
    Department of Chemistry, Faculty of Science, Kyushu University Kurita Water Industries Ltd.
  • BAI Shuqin
    College of Environmental and resources, Inner Mongolia University
  • OKAUE Yoshihiro
    Department of Chemistry, Faculty of Science, Kyushu University
  • YOKOYAMA Takushi
    Department of Chemistry, Faculty of Science, Kyushu University

Bibliographic Information

Other Title
  • 土壌溶液中のケイ酸濃度に及ぼす有機物の影響に関するモデル実験－ピロリドン系モノマーとポリマーの比較－
  • 年間特集「土」 土壌溶液中のケイ酸濃度に及ぼす有機物の影響に関するモデル実験--ピロリドン系モノマーとポリマーの比較
  • ネンカン トクシュウ ツチ ドジョウ ヨウエキ チュウ ノ ケイサン ノウド ニ オヨボス ユウキブツ ノ エイキョウ ニ カンスル モデル ジッケン ピロリドンケイ モノマー ト ポリマー ノ ヒカク

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Description

The dissolution of amorphous silica in aqueous solution in the presence of organic compounds was investigated as a preliminary experiment to elucidate the effect of organic compound on the Si concentration in soil solution. The organic compounds used in this study were Poly-N-vinylpyrrolidone (PNVP) and N-methyl-2-pyrrolidone (NMP) with carbonyl group that is a common functional groups of natural organic compounds. The dissolution rate and solubility of amorphous silica in each solution containing the organic compounds were investigated and compared with those of pure water under same condition. In PNVP solution, the dissolution of amorphous silica was retarded by covering PNVP adsorbed on silica surface. This fact may be due to stabilization by simultaneous and many hydrogen bonds between silanol groups on silica and carbonyl groups in PNVP. In contrast, in NMP solution, the solubility of amorphous silica increased compared with that in pure water, suggesting the formation of NMP-silicic acid complex. The DFT calculation showed that the stability energy of NMP–silicic acid complex was lager than that of silicic acid-water complex {Si(OH)4 + NMP > Si(OH)4 + H2O} in gas phase, suggesting that NMP-silicic acid complex may be stabilized in aqueous solution.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 60 (2), 97-102, 2011

    The Japan Society for Analytical Chemistry

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