<報文>種々のモデル環境水に溶解した塩化水銀(II)の表層土における吸・脱着特性

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Adsorption of mercury （II）chloride on a subsurface soil was studied at 25℃ using various model waters as sea water, ground water, sewage and rain water including trace amounts of HgCl2, respectively. The adsorptive ability toward HgCl2 was discussed in terms of instability partition coefficient KINS，which is defined by the following equation: KINS=（ppm of HgCl2 in a solution）/（ppm of HgCl2 in an adsorbent） The reciprocal of KINS shows a degree of adsorption of HgCl2 on an adsorbent. Moreover to investigate how much amounts of HgCl2 adsorbed on the subsurface soil could be desorbed by the various model waters, and desorption curves by them were also examined. The following results were obtained: 1）As the stable species of mercury （II） were changed according to the concentrations of HgCl2 in an aqueous solution, the adsorption data were expressed by the three kinds of the Freundlich isotherms. 2）KINS for ground water, sewage containing surface active agents and rain water at the initial HgCl2 concentration of 50mg/1 at 25℃ were determined to be 1.4×10－4, 3．2×10-4 and 2．6×10-4, but KINS for sewage containing a slight amount of Cl- to be 4.9×10-2 which was higher than above-mentioned values. Adsorption of HgCl2 on the subsurface soil was rarely found in the case of sea water, because of the repulsion of HgC13- and HgCl42- formed by the reactions between HgCl2 and Cl- toward negatively charged subsurface soil. 3）The desorption of HgCl2 by the model water for seawater was easiest of all the model waters. On the basis of results 2） and 3）, it was estimated that the desorptive ability in various model waters could be compared by using Kins instead of examining the desorption curves.
横浜国立大学の論文

<報文>種々のモデル環境水に溶解した塩化水銀(II)の表層土における吸・脱着特性

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