Effect of Inorganic Electrolytes on the Stability of Allophane in Aqueous Solutions of Anionic Xanthan Polysaccharide
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概要
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The polymeric (a) weak-stabilization (PWST), (b) flocculation (PFL), and (c) stabilization (PST) of allophane with the anionic xanthan (GX) polysaccharide (He and Horikawa 1996a, b: Soil Sci. Plant Nutr., 42, 603-612, 637-644) were investigated further with respect to the effect of 1-1, 2-1, and 1-2 electrolytes (MA). At pH 4.5, the PST was (i) high in 0.1 m_M NaCl, MgCl_2, ZnCl_2, and PbCl_2 solutions, whereas (ii) considerably low in 100 m_M NaCl, 0.1 m_M Na_2SO_4 and NaH_2PO_4 solutions, respectively. At pH 6.5 (i.e.p.), the flocculated allophane showed (i) a very low PWST in 0.01 m_M NaCl, MgCl_2, and Na_2SO_4 solutions, and also (ii) a low PST in 0.01 m_M MA except for NaH_2PO_4. In 0.01 m_M PbCl_2 and NaH_2PO_4 solutions, allophane was well dispersed, respectively, and marked PFL and PST were observed with further addition of xanthan. The changes and decrease of PWST and PST were discussed in relation to the floeculation of allophane due to the (a) effect of MA on the diffuse double layer of the particles, (b) specific adsorption of phosphate and lead ions on the surface, and (c) weakening of the repulsive force between anionic GX chains by MA.
- 社団法人日本土壌肥料学会の論文
著者
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HORIKAWA YUKIYA
Faculty of Agriculture, Kochi University
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Horikawa Yukiya
Faculty Of Agriculture Kochi Univers
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He Ming
Faculty Of Agriculture Kochi University
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