Phosphorus sorption and desorption properties of soils developed on basic rocks under a subhumid Mediterranean climate

Horta, Carmo; Monteiro, Fernando; Madeira, Manuel; Torrent, J.

doi:10.1111/j.1475-2743.2012.00405.x

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…Unlike the present study, in other research conducted for Andosols ( Van Ranst et al, 2004 ; Auxtero, Madeira & Sousa, 2008 ) the best fit corresponded to Langmuir isotherms. Both the Langmuir and Freundlich models well describe P sorption on a variety of Australian soils ( Singh & Gilkes, 1991 ), Thai Oxisols and Ultisols ( Wisawapipat et al, 2009 ), soils developed from basic rocks in Portugal ( Horta et al, 2013 ), and forest and vineyard soils from Galicia, Spain ( Romar-Gasalla et al, 2016 ). The Langmuir, Freundlich and Temkin models can be used to describe P sorption on various Chinese soils ( Wang et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

González-Rodríguez

Fernández-Marcos

2018

PeerJ

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Volcanic soils cover 1% of the Earth’s surface but support 10% of the world’s population. They are among the most fertile soils in the world, due to their excellent physical properties and richness in available nutrients. The major limiting factor for plant growth in volcanic soils is phosphate fixation, which is mainly attributable to active species of aluminium and iron. The sorption and desorption of phosphate is studied on the surface horizons of two African agricultural soils, a silandic Andosol (Rwanda) and a vitric Andosol (São Tomé and Principe). Both soils are slightly acid. The silandic Andosol is rich in active aluminium forms, while the vitric Andosol has high amounts of crystalline iron and aluminium oxides. Sorption isotherms were determined by equilibrating at 293K soil samples with phosphate solutions of concentrations between 0 and 100 mg P L−1 in NaNO3; phosphate was determined by visible spectrophotometry in the equilibrium solution. To study desorption, the soil samples from the sorption experiment were equilibrated with 0.02 M NaNO3. The isotherms were adjusted to mathematical models. In almost all the concentration range, the adsorption of phosphate by the silandic Andosol was greater than 90% of the amount added, being lower in the vitric Andosol but always higher than 65%. The high sorption by the silandic Andosol is attributed to its richness in non-crystalline Fe and Al, while in the vitric Andosol crystalline iron species seem to play a relevant role in the adsorption. The sorption isotherms of both soils fitted to the Temkin model, the adjustment to the Langmuir or Freundlich models being unsatisfactory; throughout the range studied, the sorption increases with increasing phosphorus concentration, a maximum sorption is not predictable (as occurs when the sorption is adjusted to the Langmuir model). For an added P concentration of 100 mg L−1 (3.2 mmol L−1), the sorption is 47.7 µmol P g−1 in the silandic Andosol and 41.6 µmol P g−1 in the vitric Andosol. The desorption is low and the comparison of the sorption and desorption isotherms reveals a pronounced hysteresis, that is, the irreversibility of the sorption. The high phosphate sorption and its irreversibility are comparable to those published for other volcanic soils with high contents of allophane, active aluminium and free iron. The strong phosphate adsorption is a serious limiting factor for plant growth, which requires a careful management of phosphorus fertilization.

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Section: Discussionmentioning

confidence: 99%

Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

González-Rodríguez

Fernández-Marcos

2018

PeerJ

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“…Lower values of R 2 could be caused by the non-exhaustion of the maximum sorption capacity of the materials in the established range of contaminants. The results of phosphate removal (R 2 from 0.548 to 0.986) were described least precisely, despite the fact that numerous authors have shown the usefulness of the Langmuir isotherm for the description of phosphate sorption on minerals and organic materials [78,79]. This could be caused by the low abilities of the applied materials for the removal of such contaminants.…”

Section: Equilibrium Testsmentioning

confidence: 93%

The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

Fronczyk

Mumford

2019

Applied Sciences

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Appropriate management of urban stormwater requires consideration of both water quantity, resulting from flood control requirements, and water quality, being a consequence of contaminant distribution via runoff water. This article focuses on the impact of temperature on the efficiency of stormwater treatment processes in permeable infiltration systems. Studies of the removal capacity of activated carbon, diatomite, halloysite, limestone sand and zeolite for select heavy metals (Cu and Zn) and biogenes (NH4-N and PO4-P) were performed in batch conditions at 3, 6, 10, 15, 22, 30 and 40 °C at low initial concentrations, and maximum sorption capacities determined at 3, 10, 22 and 40 °C. A decrease in temperature to 3 °C reduced the maximum sorption capacities (Qmax) of the applied materials in the range of 10% for diatomite uptake of PO4-P, to 46% for halloysite uptake of Cu. Only the value of Qmax for halloysite, limestone sand and diatomite for NH4-N uptake decreased slightly with temperature increase. A positive correlation was also observed for the equilibrium sorption (Qe) of Cu and Zn for analyses performed at low concentrations (with the exception of Zn sorption on limestone sand). In turn, for biogenes a rising trend was observed only in the range of 3 °C to 22 °C, whereas further temperature increase caused a decrease of Qe. Temperature had the largest influence on the removal of copper and the smallest on the removal of phosphates. It was also observed that the impact of temperature on the process of phosphate removal on all materials and ammonium ions on all materials, with the exception of zeolite, was negligible.

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“…Unlike the present study, in other research conducted for Andosols (Van Ranst et al, 2004;Auxtero et al, 2008) the best fit corresponded to Langmuir isotherms. Both the Langmuir and Freundlich models well describe P sorption on a variety of Australian soils (Singh and Gilkes, 1991), Thai Oxisols and Ultisols (Wisawapipat et al, 2009), soils developed from basic rocks in Portugal (Horta et al, 2013), and forest and vineyard soils from Galicia, Spain (Romar-Gasalla et al, 2016). The Langmuir, Freundlich and Temkin models can be used to describe P sorption on various Chinese soils (Wang et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Peer Review #3 of "Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa (v0.1)"

2018

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Volcanic soils cover 1% of the Earth's surface but support 10% of the world's population. They are among the most fertile soils in the world, due to their excellent physical properties and richness in available nutrients. The major limiting factor for plant growth in volcanic soils is phosphate fixation, which is mainly attributable to active species of aluminium and iron. The sorption and desorption of phosphate is studied on the surface horizons of two African agricultural soils, a silandic Andosol (Rwanda) and a vitric Andosol (São Tomé and Principe). Both soils are slightly acid. The silandic Andosol is rich in active aluminium forms, while the vitric Andosol has high amounts of crystalline iron and aluminium oxides. Sorption isotherms were determined by equilibrating at 293K soil samples with phosphate solutions of concentrations between 0 and 100 mg P L-1 in NaNO 3 ; phosphate was determined by visible spectrophotometry in the equilibrium solution. To study desorption, the soil samples from the sorption experiment were equilibrated with 0.02 M NaNO 3. The isotherms were adjusted to mathematical models. In almost all the concentration range, the adsorption of phosphate by the silandic Andosol was greater than 90% of the amount added, being lower in the vitric Andosol but always higher than 65%. The high sorption by the silandic Andosol is attributed to its richness in non-crystalline Fe and Al, while in the vitric Andosol crystalline iron species seem to play a relevant role in the adsorption. The sorption isotherms of both soils fitted to the Temkin model, the adjustment to the Langmuir or Freundlich models being unsatisfactory; throughout the range studied, the sorption increases with increasing phosphorus concentration, a maximum sorption is not predictable (as occurs when the sorption is adjusted to the Langmuir model). For an added P concentration of 100 mg L-1 (3.2 mmol L-1), the sorption is 47.7 μmol P g-1 in the silandic Andosol and 41.6 μmol P g-1 in the vitric Andosol. The desorption is low and the comparison of the sorption and desorption isotherms reveals a pronounced hysteresis, that is, the irreversibility of the sorption. The high phosphate sorption and its irreversibility are comparable to those published for other volcanic soils

show abstract

Phosphorus sorption and desorption properties of soils developed on basic rocks under a subhumid Mediterranean climate

Cited by 10 publications

References 33 publications

Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

Peer Review #3 of "Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa (v0.1)"

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