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为探究有机酸对镉在纳米粒级土壤上的有效性及其形态的影响,基于超声—离心—冻融法,应用到四川省名山河流域老冲积黄壤中,获得纳米微粒(≤100 nm),分别研究不同分子量有机酸(柠檬酸、富里酸、EDTA)及其组合(柠檬酸+EDTA、柠檬酸+富里酸、富里酸+EDTA)对土壤纳米微粒吸附Cd~(2+)动力学特性的影响。结果表明,土壤纳米微粒对Cd~(2+)的动力学吸附量大小关系表现为:柠檬酸+EDTA>富里酸>柠檬酸+富里酸>柠檬酸>富里酸+EDTA>EDTA。总的来看,EDTA的抑制作用最强,最能降低土壤纳米微粒对Cd~(2+)的吸附。
In order to explore the effect of organic acids on the availability and morphology of Cd on NPs, the nanoparticles were applied to the alluvial yellow soil in the Miaoshanhe basin of Sichuan Province based on the ultrasonic-centrifugation-freeze-thaw method to obtain nanoparticles (≤100 nm) The kinetics of Cd 2+ adsorption on soil nano-particles by different concentrations of organic acids (citric acid, fulvic acid, EDTA) and their combinations (citric acid + EDTA, citric acid + fulvic acid, fulvic acid + EDTA) Impact. The results showed that the relationship between the amount of Cd 2+ and the adsorption kinetics of Cd 2+ by soil nanoparticles was as follows: citric acid + EDTA> fulvic acid> citric acid + fulvic acid> citric acid> fulvic acid + EDTA> EDTA. In summary, EDTA has the strongest inhibitory effect on the adsorption of Cd 2+ by soil nanoparticles.