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Humic Acid Adsorption Effect To Soil Heavy Metals
Mar 19, 2018

According to its adsorption mechanism, humic acid adsorption effect to soil heavy metals can be divided into ion exchange adsorption, chelate (adsorption) adsorption and special adsorption (selective adsorption). Humic acid, as a kind of large molecular negatively charged colloid, has a large cation exchange capacity. The surface adsorbed ions can easily occur ion exchange with heavy metal existed in soil solution to form ion exchange adsorption; Humic acid contains a large number of oxygen-containing functional groups, which can chelate with heavy metal to form complex(chelate) adsorption; Generally, it may show positive charge after the chelate of humic acid and heavy metal, it may bring electrostatic adsorption with the negatively charged soil colloidal surface to improve the adsorption ability of heavy metals. The adsorption capacity of humic acid to metal ions is Pb> Cu> Zn> Cd, which is mainly caused by its specific structure and functional groups, so the adsorption capacity to different metals are also different. The humic acid adsorption capacity to Pb and Ni is better than Cr. It shows that the difference of humic acid adsorption capacity to different heavy metal ions not only influenced by sorts of humic acid, but also influenced by environmental conditions (EG: PH) and some other factors.

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