The mobility and bioavailability of heavy metals depend heavily on their physical and chemical forms and their interactions with the different soil phases. The sorption capacities of different soils (sandy, lime, clay) using Cu(II) as model ion were studied. At first the equilibration time between solid and liquid phases was determined and for practical convenience, 48 h was applied. The optimum initial pH-range was found as pH=3,5 6 and it was very much dependent on the soil type. From the pH changes taking place during the equilibration process it was concluded that either protons or hydroxyl ions were released into the solution. The study of the effect of ionic strenght on the adsorption of metal ions yielded that Na ions showed two different effects, they decreased the adsorption of Cu(II) ions by occupying the sorption sites and, on the other hand, the Na ions considerably destroyed the mineral phases of the soils and increased the adsorption capacity. The effect of changes of the concentration on the adsorption process was investigated in the range of 1 -10 mmol/dm3 initial concentration using the optimum pH values. Linear langmuir isotherm was fitted onto the initial part of the adsorption isotherms for 1-4,5 mmol Cu(II) ion/dm3.
|Number of pages||9|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Dec 1 1999|
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