Phosphate Sorption by Some Alfisols of Greece as Described by Commonly Used Isotherms

Polyzopoulos, N. A.; Keramidas, V. Z.; Kiosse, Helen

doi:10.2136/sssaj1985.03615995004900010016x

Cited by 39 publications

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“…The Freundlich model had significantly better fit to the experimental data than the Langmuir model, as indicated by the higher R 2 and lower SE values when compared to the Langmuir model for all three soils (p < 0.01). This could be explained by the assumptions inherited in the Langmuir model, which may not be valid for heterogeneous soil colloids (Polyzopoulos et al, 1985).…”

Section: Sorption Equilibrium Modelmentioning

confidence: 99%

Reducing Copper Availability in Contaminated Soils Using Drinking Water Treatment Residuals

Moharem

Elkhatib

Elgammal

2013

Soil and Sediment Contamination: An International Journal

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Copper mobility and availability in soil environments is largely controlled by Cu sorption reactions as well as its chemical forms. In this study, equilibrium, kinetic batch experiments, and a chemical fractionation scheme were carried out to evaluate effects of drinking water treatment residual (DWTR) application on sorption and bioavailability of Cu in three arid zone soils having different properties. Distinct differences in the amounts of Cu sorbed among the different soils were observed where highest sorption was associated with clay, OM, and CEC contents. The quantity of Cu sorbed on the three studied soils drastically increased as a result of increasing rates of DWTR application from 2% to 12% (w/w). Freundlich distribution coefficient (K f ) values indicate that Cu sorption affinities for the studied soils followed the trend Typic torrifluvent (TF) > Typic calciorthids (CO) > Typic torripsamment (TP) soils. The sorption of Cu was initially fast with 95, 92, and 73% of Cu sorbed on TF and CO and TP unamended soils, respectively, in the first 60 min. Following the initial fast reaction, the sorption reaction continued for 63 h, after which only a small amount of additional sorption occurred (2-6%). The parabolic diffusion law and the power function models described Cu sorption kinetics in all the sorbents studied equally well as the R 2 values were quite high and SE values were low. Addition of DWTR drastically reduced non-residual (NORS) Cu and simultaneously increased residual (RS) Cu fractions. At 12% application rate, DWTR decreased NORS-Cu in nonamended soils from 10.9 to 4.2, from 50.2 to 21.5, and from 78.6 to 33.3% in TF, CO, and TP soils, respectively. Our results suggest that as the application rate of DWTR to Cu-contaminated soils increased, more Cu was associated with the residual fractions, which decreased potential Cu mobility and bioavailability in these soils.

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Section: Sorption Equilibrium Modelmentioning

confidence: 99%

Reducing Copper Availability in Contaminated Soils Using Drinking Water Treatment Residuals

Moharem

Elkhatib

Elgammal

2013

Soil and Sediment Contamination: An International Journal

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“…Langmuir, Freundlich and Tempkin models are commonly used in the determination of P sorption capacity (Fitter and Sutton, 1973;Polyzopoulos et al, 1985;Kuo, 1988;Lopez et al, 1990;Pierzynski, 2000;Comfort and Eghball, 2002), while successive extractions with dilute calcium chloride (CaCl 2 ) are commonly used for the determination of P desorption capacity (McDowell and Sharpley, 2001). The modelling of P adsorption isotherms by the Langmuir equation is preferred to other models because it provides a value of P sorption maxima (Woodruff and Kamprath, 1965;Graetz and Nair, 2000).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus sorption maxima and desorbability in selected soils with andic properties from the Azores, Portugal

Auxtero¹,

Madeira²,

Sousa³

2008

Geoderma

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“…Because of their common occurrence and high P-sorption capacity, the P sorption characteristics of red soils continue to be investigated. Several workers in Greece have dealt with P sorption in various soils (Nychas and Kosmas, 1984;Simonis, 1986;Keramidas and Polyzopoulos, 1983;Polyzopoulos et al, 1985). However, there has not been research^ specifically focused on the P sorption by these red soils.…”

Section: Introductionmentioning

confidence: 99%

Phosphate sorption by red mediterranean soils from Greece

Tsadilas

Samaras

Dimoyiannis

1996

Communications in Soil Science and Plant Analysis

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In nineteen surface horizons of red Mediterranean soils from various locations of Greece, phosphorus (P) sorption experiments were conducted and the sorption characteristics were studied in relation to soil properties. Phosphate sorption data were fitted both to the Langmuir and Freundlich equations. From these equations, the following P sorption parameters were determined from the Freundlich equation, X = AC n , the parameters A (the phosphate sorbed at C = 1 mg P/L), n (the P sorption intensity), the P sorption index (PS = X/log C) and maximum P sorption (Xmfr). From the Langmuir equation, C/X = 1/KXm + C/Xm, the parameters K (showing the bonding energy), maximum P sorption (Xmla), the quantity of P adsorbed at a standard concentration of 0.2 mg P/L (P0.2), and P maximum buffering capacity (PMBC). The Freundlich parameter A was strongly correlated to the clay and sesquioxides ("free" iron and aluminum oxides and amorphous iron oxides) content. Seventy-four percent of the variance of this parameter was explained by clay and "free" iron (Fe) content. The Freundlich parameter n was significantly correlated with pH and amorphous iron oxides content, while 52% of its variance was explained by amorphous Fe and dithionite extractable aluminum (Al). The P sorption maxima calculated from the Freundlich equation were in general lower than those calculated by the Langmuir equation. Both these parameters were strongly correlated with clay and more slightly with sesquioxides content. About 50% of their variance was explained by clay content of the soils. The P sorption index was strongly correlated with the clay content and less strongly with dithionite-extractable Fe and Al. The P-buffering capacity calculated from the data of Langmuir equation was also strongly correlated with 2279

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Phosphate Sorption by Some Alfisols of Greece as Described by Commonly Used Isotherms

Cited by 39 publications

References 0 publications

Reducing Copper Availability in Contaminated Soils Using Drinking Water Treatment Residuals

Reducing Copper Availability in Contaminated Soils Using Drinking Water Treatment Residuals

Phosphorus sorption maxima and desorbability in selected soils with andic properties from the Azores, Portugal

Phosphate sorption by red mediterranean soils from Greece

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