物理化学学报 >> 1998, Vol. 14 >> Issue (03): 278-282.doi: 10.3866/PKU.WHXB19980318

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带电胶体离子扩散与交换动力学的比较

李航, 陈明树   

  1. 西南农业大学资源环境学院，重庆 400716|西南师范大学生物系，重庆 400716
  • 收稿日期:1997-05-19 修回日期:1997-10-24 发布日期:1998-03-15
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Study on the Comparison of the Kinetics of Ion Diffusion and Ilon Exchange in Charged Colloid

Li Hang, Chen Ming-Shu   

  1. College of Resources and Environment,Southwest Agricultural University,Chongqing 400716|Biology Department ,Southwest Teachers University,Chongqing 400716
  • Received:1997-05-19 Revised:1997-10-24 Published:1998-03-15
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关键词: 胶体, 粗分散体, 离子扩散, 离子交换, 动力学

Abstract:

Taking soil colloid and hydrated silica (quartz sand) as the experimental material, the comparative study has been made on the kinetics of ion diffusion and ion exchange in charged colloid and charged coarse disperse systems. The results showed that ion exchange kinetics in the two systems conform to the kinetic law of ion diffusion. Besides, through this comparative study on the kinetics of ion exchange and ion diffusion, a method has been advanced theoretically to estimate the quantity of adsorbed ion that is located in the inner of the Helmholtz layer. As far as hydrated silica is concerned , there were about 33 per cent of the total adsorbed quantity of Mg2+that were located in the inner of the Helmholtz layer under the given experimental conditions, bu tfor soil colloid the percentage was only 7.5.

Key words: Colloid, Coarse dispersion, Ion diffusion, Ion exchange, Kinetics