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Chemical states of phosphorus adsorbed on goethite surfaces at various phosphate concentrations

机译：不同磷酸盐浓度下针铁矿表面吸附的磷的化学态

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Phosphorus (P) is one of the three mest important elements that support the growth of crops. The fixation of P by iron (Fe) and aluminum (Al) oxides is a main reason for low phosphorus efficiency in variable charge soils. Previous studies on the mechanism of P fixation on soil surfaces were mainly performed through the routine chemical analyses of equilibrium adsorption, readsorption and desorption of P on Fe oxide surfaces, and through the investigations of hydroxyl types and charge amount on the Feoxide surface. It could be inferred from the studies that P concentration could influence the tightness and bonding ways between P and the surfaces of Fe and Al oxides: monodentate coordination compounds (complexes) were formed at a higher P concentration, which were desorbed easily; binuclear (bridging) coordination compounds were formed at a lower P concentration, which were desorbed difficultly. So far, there are only a few reports on the chemical states of P adsorbed on Fe and Al oxide surfaces atdifferent P concentrations. This note directly surveys the structural information and chemical states of goethite surfaces binding P at different P concentrations by X-ray photoelectron spectroscopy (XPS) techniques so as to reveal the P fixing mechanisms of Fe and Al oxides in variable charge soils and provide a scientific basis for the reasonable utilization of P fertilizer and the regulation of P states in the soils
机译：磷（P）是支持农作物生长的三个最重要的元素之一。铁（Fe）和铝（Al）的氧化物固定磷是可变电荷土壤中磷效率低的主要原因。先前对土壤表面固磷的机理的研究主要是通过常规化学分析法对铁氧化物表面上磷的平衡吸附，再吸附和解吸，以及对羟基氧化物类型和表面上电荷的研究。从研究中可以推断出P的浓度会影响P与Fe和Al氧化物表面之间的紧密度和键合方式：在P较高的浓度下会形成单齿配位化合物（配合物），并且容易脱附;在较低的P浓度下会形成双核（桥联）配位化合物，难以解吸。到目前为止，只有很少的报道报道了在不同的P浓度下，Fe和Al氧化物表面吸附的P的化学状态。本说明通过X射线光电子能谱（XPS）技术直接调查了在不同P浓度下结合P的针铁矿表面的结构信息和化学状态，从而揭示了可变电荷土壤中Fe和Al氧化物的P固定机理，并提供了科学依据。磷肥合理利用和土壤磷素调控的基础

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