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首页> 外文期刊>Environmental toxicology and chemistry >Characterization of Pb, Cu, and Cd adsorption on particulate organic matter in soil.
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Characterization of Pb, Cu, and Cd adsorption on particulate organic matter in soil.

机译：表征土壤中颗粒有机物对Pb，Cu和Cd的吸附

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摘要

Evidence exists for significant metal enrichment in particulate organic matter (POM) compared to other soil constituents, but the relevant mechanisms are poorly understood. In the present study, adsorption of the heavy metals Pb, Cu, and Cd on a loamy soil and on POM separated from this soil was investigated. The adsorption kinetic data can be well described with a pseudo-second order model, whereas the equilibrium data are well fitted by a Langmuir model. Adsorption isotherms and kinetics data, in addition to the influence of pH on metal adsorption, showed that POM had a much higher adsorption capacity for Pb, Cu, and Cd compared to the whole soil. Ionic strength effects on metal adsorption, Fourier transform infrared spectroscopy, x-ray absorption spectroscopy x-ray absorption spectroscopy including x-ray absorption near-edge structure and extended x-ray absorption fine-structure spectroscopy were employed to elucidate the adsorption mechanisms. The results suggested that Pb and Cu adsorption on POM was mainly through inner-sphere complexes with carboxyl and hydroxyl groups. Cadmium was possibly adsorbed via outer-sphere complexation, indicated by the influence of ionic strength on Cd adsorption.
机译：有证据表明，与其他土壤成分相比，颗粒有机物（POM）中有大量的金属富集，但有关机理尚不清楚。在本研究中，研究了重金属Pb，Cu和Cd在壤土和从该土壤分离的POM上的吸附。吸附动力学数据可以用伪二级模型很好地描述，而平衡数据可以通过Langmuir模型很好地拟合。吸附等温线和动力学数据，除了pH值对金属吸附的影响外，还表明，与整个土壤相比，POM对Pb，Cu和Cd的吸附能力要高得多。离子强度对金属吸附的影响，傅立叶变换红外光谱，X射线吸收光谱，包括X射线吸收近边缘结构和扩展X射线吸收精细结构光谱的X射线吸收光谱被用来阐明吸附机理。结果表明，Pb和Cu在POM上的吸附主要是通过带有羧基和羟基的内球络合物。离子强度对Cd吸附的影响表明，镉可能通过外球络合吸附。

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