Interactions of Humic Acids with Some Hydrophobic Compounds

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  • フミン酸と疎水性化合物との相互作用
  • フミンサン ト ソスイセイ カゴウブツ ト ノ ソウゴ サヨウ エイブン

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Interactions between humic acids and hydrophobic compounds pyrene and icosane were studied by water solubility enhancement and fluorescence measurements. Humic acids were extracted from marine sediments. Salts obtained commercially were also used.<BR>The solubility of pyrene in humic acid solution as determined by the so-called flask method was followed by spectrophotometry and found to increase with humic acid concentration. The addition of salts decreased the solubility of pyrene, paticularly so with CsCl. The solubilizing ability of humic acids was calculated as Ks which appeared to depend on the surface activity of marine humic acid. The association constant of pyrene with humic acids, Kb, was determined by the fluorescence quenching method. Kb for marine humic acids ranged in 2.2-10.4 × 104 L/kg and for commercial humic acids, 8.1 and 8.4 × 104 L/kg. The values.were related to the aromaticity of humic acid. The intensity ratio of pyrene fluorescence indicated the addition of humic acid to provide a less polar environment for pyrene. Humic acids are very complicated substances, and thus the results obtained using different method may indicate different kinds of interactions. The discrepancy in results on SJ-1 humic acid by two methods, for the largest Ks and smallest Kb, may be due to its specific structure.

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