【摘要】 <正> 为了解重金属在水体中的迁移,探讨河口区域对它们的自净能力,我们曾研究过珠江口海域沉积物对汞、镉的吸附及其解吸作用,并找到了影响吸附作用的重要环境因素。本文仅是报道珠江口海域沉积物对汞、镉吸附的热力学和动力学的研究结果,这些结果对进一步弄清汞、镉在珠江口海域水体中的迁移机制是有益的。更多还原

【Abstract】 In this paper, we have studied the isothermal line of adsorption, heat of adsorption, isothermal equation of adsorption and activation energy of adsorption for Hg and Cd by the sediments in the Zhujiang estuarine area. The results indicate; (l)The adsorption isothermaI equation for Hg and Cd at 25℃ by the sediments in this area are:where x/m is the adsorption amount of Hg or Cd (μg/g), Ceq is the con-centration when the equilibrium of adsorption reaches (fig/1). (2)The adsorption heat for Hg is 23 kcal./mol. ,and that for Cd is 12kcal./mol. (3) The activation energy of adsorption for Hg is 5.2kcal./mol, and that for Cd is 8.5kcal./mol. (4) The adsorption for Hg and Cd by the sediments in the Zhujiang estuarine area is mainly chemical adsorption, and the average rate of adsorption for Hg is greater than that for Cd.更多还原