1981
DOI: 10.1071/sr9810333
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A comparison of the Langmuir, Freundlich and Temkin equations to describe phosphate adsorption properties of soils

Abstract: Four adsorption equations were fitted to phosphate isotherm data for 38 soils from northern New South Wales. The two-surface Langmuir equation provided the best fit to the data. The Freundlich equation, however, was almost as effective, provided that an estimate of native adsorbed phosphate was included. It required fewer adsorption points because the transformed data produced a straight line. A regression constant, a, from the Freundlich equation although underestimating adsorption capacity, calculated from t… Show more

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Cited by 93 publications
(55 citation statements)
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“…Like in water soluble P, the relationship between the EBS and the molar ratio (OLSEN and WATANABE 1957, KAILA 1963, BACHE and WILLIAMS 1971, MEAD 1981. Also these isotherms, generally applied to sorption studies, normally fit the sorption data only within a limited range of phosphate concentrations in solution (MEAD 1981).…”
Section: Resultsmentioning
confidence: 99%
“…Like in water soluble P, the relationship between the EBS and the molar ratio (OLSEN and WATANABE 1957, KAILA 1963, BACHE and WILLIAMS 1971, MEAD 1981. Also these isotherms, generally applied to sorption studies, normally fit the sorption data only within a limited range of phosphate concentrations in solution (MEAD 1981).…”
Section: Resultsmentioning
confidence: 99%
“…The goodness of the fit of the Langmuir equations was compared by single regression analysis of the actual and predicted As adsorption for each soil (e.g. Mead, 1981).…”
Section: Discussionmentioning
confidence: 99%
“…Metal concentrations of adsorbed heavy metals were estimated by C Adsorption isotherms were adjusted using the algorithm Fitfunc.bas (Barrow 1987), which adjusts non-linear equations to the results using the "minimum deviation" method (Mead, 1981;Shani et al, 1992) to calculate the maximum adsorption for each metal. In soils with high Cu adsorption, the isotherm could not be fitted to the experimental data even in the cases of small concentration in the solution (Ox1, Ox5, Oll and Alf1).…”
Section: Methodsmentioning
confidence: 99%