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几种可变电荷土壤中氧化铁类型与磷吸附特性 被引量:7

TYPES OF Fe OXIDES AND THEIR PHOSPHATE SORPTION CHARACTER IN SOILS WITH VARIABLE CHARGE
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摘要 应用X射线衍射和化学分析等手段研究了红壤、砖红壤和黄棕壤中氧化铁类型及其与磷吸附和解吸的关系。结果表明:①黄棕壤中的氧化铁是针铁矿型,砖红壤和红壤是以赤铁矿为主、棕红壤是以针铁矿为主的针-赤混合型。②针铁矿的MCD值一般小于赤铁矿的MCD值,前者的比表面积大,后者的小。砖红壤中的赤铁矿晶体薄,红壤中的厚。③针铁矿型氧化铁的磷吸附量明显高于针-赤混合型氧化铁的磷吸附量,并随粘粒中G/(G+H)值增大而提高。赤铁矿晶体愈薄,吸附的磷量愈少。④磷的解吸率随氧化铁中G/(G+H)值增加而降低,赤铁矿形貌对磷的解吸率影响不明显。 The types of Fe oxides and their relation to phosphate adsorption or desorption on clay fractions were investigated by means of XRD and chemical analysis methods. Results indicated that the type of Fe oxide was only goethite in yellowbrown soil. The dominant Fe oxide was hematite in latosol and red soil, and was goethite in brown red soil. The MCD values of goethite were generally smaller than those of hematite, but the specific surface areas of the former were greater than those of the latter. The P adsorption of goethite was much greater than that of the mixture of goethite and hematite, and the P adsorption increased with increasing the G/(G+H) value in Fe oxides. The thinner the hematite crystal was, the less the P adsorbed would be. The P adsorbed on goethite was desorbed more difficulty than that on hematite. The difference of hematite morphology hardly influenced the desorbing ratio of P adsorbed by hematite.
出处 《华中农业大学学报》 CAS CSCD 北大核心 1993年第5期450-454,共5页 Journal of Huazhong Agricultural University
基金 国家自然科学基金
关键词 氧化铁 针铁矿 赤铁矿 吸附 Fe oxide, goethite, hematite, phosphate adsorption
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