Deposition Kinetics and Critical Deposition Concentrations of Humic Acids with Different Molecular Weight

  • YAMASHITA Yuji
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • TANABE Yousuke
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • ADACHI Yasuhisa
    Graduate School of Life and Environmental Sciences, University of Tsukuba

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  • 分画分子量の異なるフミン酸の沈着速度と臨界沈着濃度
  • ブンカク ブンシリョウ ノ コトナル フミンサン ノ チンチャク ソクド ト リンカイ チンチャク ノウド

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Abstract

We obtained breakthrough curves of humic acids with different molecular weight (SHA, 30,000 - 100,000; LHA, 100,000 - 300,000) through the column packed with glass beads with various NaCl concentrations. Each breakthrough curve of each humic acid reached almost a stable plateau at which the relative concentration was less than unity. The relative concentrations at each plateau decreased with an increase in the NaCl concentration. From the experimental study, dimensionless deposition rate constants and collision efficiencies of humic acids were calculated. Collision efficiencies were plotted as a function of NaCl concentration to draw a colloidal stability curve. In both humic acids, the obvious boundary points, which were known as the critical deposition concentration (CDC), were obtained from the colloidal stability curve. The value of CDC of smaller molecular weight fraction was higher than that of larger one. In the slow deposition condition, the slope of the stability curve of larger molecular weight fraction was steeper than that of smaller one.

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