Research on the Fixation Capacity in Situ of Organic-inorganic Complex to the Heavy Metal-Cu2+ in Contaminated Soil
[Objective] The reference for the problem - solving of heavy metals' pollution in soil was provided. [Method] The organic -inor ganic complex in bentonite was improved with DTPA prepared with the technology of wetting method and the best value of the affecting factor (temperature, humidity, number of adsorption and desorption in the adsorbent for metal ion - Cu2+ in soil was determined with the design of sin gle - factor experiment. [ Result ] In the experiment in the adsorbent of metal ion - Cu2 * in soil, the optimum temperature was 20 ℃ ; the opti mum moisture(soil water holding capacity), 90% ; the optimum number of the adsorption and desorption of organic - inorganic complex, 3 times, and the adsorption capacity was significantly decreased if the number of the adsorption and desorption was beyond three times and the sup plement or the replacement of new adsorbent was needed for the improvement of its adsorption capacity. [ Conclusion] The theoretical basis of the control of non - point source pollution of heavy metal in soil was provided through the research.
Organic - inorganic complexContaminated soilFixation in situ
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