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首页> 外文期刊>International journal of soil science >A Comparison of the Langmuir, Freundlich and Temkin Equations to Describe Phosphate Sorption Characteristics of Some Representative Soils of Bangladesh
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A Comparison of the Langmuir, Freundlich and Temkin Equations to Describe Phosphate Sorption Characteristics of Some Representative Soils of Bangladesh

机译：孟加拉国代表性土壤磷吸收特性的Langmuir，Freundlich和Temkin方程的比较

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To study the phosphate sorption potential of soils, an experiment was conducted with eight different soil series of Bangladesh. The soils were equilibrated with 0.01 M calcium chloride solution containing 0, 1, 2, 4, 8, 16, 25, 50, 100 and 150 μg phosphorus mL-1 and the amount of phosphate sorbed was determined. Calcareous soils sorbed more phosphorus than non-calcareous soils. The sorption curves showed more or less similar pattern of changes. Langmuir model showed better fit to sorption data at higher P concentrations. Phosphate sorption was highly correlated with Fe oxide and clay content of the soils. Freundlich constant kf and n, Phosphorus Sorption Maximum (Smax) and EPC0 values were positively correlated with both the above soil properties . On the contrary, phosphate binding strength (b) was negatively correlated. It is suggested that Langmuir equation might be more suitable for commercial soil-testing laboratories for routine determination of phosphate sorption characteristics of soils.
机译：为了研究土壤对磷酸盐的吸附潜力，对孟加拉国的八个不同土壤系列进行了一项实验。用0.01 M氯化钙溶液平衡土壤，该溶液含有0、1、2、4、8、16、25、50、100和150μg磷mL -1 ，并测定了吸附的磷酸盐量。钙质土壤比非钙质土壤吸收更多的磷。吸附曲线显示或多或少相似的变化模式。 Langmuir模型显示出在更高的P浓度下更适合吸附数据。磷酸盐的吸附与土壤中的氧化铁和粘土含量高度相关。弗氏常数k f 和n，最大磷吸附量（S max ）和EPC 0 值与上述两种土壤特性均呈正相关。相反，磷酸盐结合强度（b）呈负相关。建议Langmuir方程可能更适合于商业土壤测试实验室，用于常规测定土壤的磷酸盐吸附特性。

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