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应用X射线衍射和化学分析等手段研究了中南地区几种地带性土壤中的氧化铁类型与钼吸附的关系，结果表明：供试土壤粘粒的氧化铁以晶质氧化铁为主，非晶质氧化铁含量低；砖红壤和赤红壤中的晶质氧化铁以赤铁矿为主．其次为针铁矿；红壤、棕红壤中针铁矿含量比赤铁矿含量稍高，黄棕壤中的晶质氧化铁全为针铁矿；针铁矿的平均晶粒大小（MCD）一般比赤铁矿的小，而比表面积却比赤铁矿的大；针铁矿型氧化铁的钼吸附量比针－赤混合型氧化铁的高，从砖红壤到黄棕壤．单位重量的晶质氧化铁的钼吸附量随G／（G＋H）比值的升高而增大．
The relationship between the type of iron oxide and molybdenum adsorption in several zonal soils of central-southern China was studied by means of X-ray diffraction and chemical analysis. The results show that the iron oxides of the clay for test soil mainly consist of crystalline iron oxide, The content of iron oxide is low; the hematite is the main iron oxide in brick red soil and kryptonite. Followed by goethite. In red soil and brown-red soil, the content of goethite was slightly higher than that of hematite, while the crystalline iron oxide in yellow-brown soil was all goethite. The average grain size (MCD) of goethite was generally It is smaller than hematite and its specific surface area is larger than that of hematite. The gypsum-type iron oxide has higher molybdenum sorption capacity than red-iron mixed iron oxide from brick red soil to yellow brown soil. The amount of molybdenum per unit weight of crystalline iron oxide increases with the increase of G / (G + H) ratio.