Mechanism of Adsorption of Organic Matter Amino-acids on Soil Minerals
As the behavior of adsorption of organic matter amino-acids on soil minerals would affect the carbon/nitrogen cycle,the study on the mechanism of adsorption of the organic matter by soil minerals is of environmental and scientific signif-icance.The adsorption behavior of five amino acids with different molecular weights on three typical soil minerals was investi-gated.FIRT and XRD characterization,as well as the comparative experiments,were used to explore the adsorption mecha-nism.Results of the study showed none of the adsorption of tryptophan and phenylalanine onto montmorillonite,kaolinite and hematite;on the other hand,tyrosine and thymus pentapeptide were similarly adsorbed on kaolinite and hematite at lower amounts,and both of them could be adsorbed on montmorillonite up to 30 mg/g and 38 mg/g,respectively.Adsorption of bovine serum albumin on minerals was in the order of decreasing magnitude as hematite＞kaolinite≈ montmorillonite.Adsorp-tion of amino acids on both hematite and kaolinite showed a trend:the greater molecular weight,the higher the adsorption capacity;and the regularity of adsorption of organic matters on montmorillonite showed an order of decreasing magnitude as oligopeptide＞amino-acid＞protein.
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