Citrate adsorption can decrease soluble phosphate concentration in soil: Experimental and modeling evidence

Duputel, Marek; Hoye, Florence Van; Toucet, Joëlle; Gérard, Frédéric

doi:10.1016/j.apgeochem.2013.09.017

Cited by 26 publications

(13 citation statements)

References 66 publications

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“…The release of these ions was measured in an experiment of Duputel et al. () for an additional 100 µM of citric acid, and it was reported that, on the contrary, low citrate concentrations (< 20 µM) were responsible for a decrease of available phosphorus for the investigated soil. This was explained by a large adsorption of citrate, which enhanced Ca 2+ adsorption and facilitated the binding of phosphorus through Ca‐bridging reactions (citrate–Ca–P).…”

Section: Discussionmentioning

confidence: 99%

Crystallization of single and binary iron‐ and aluminum hydroxides affect phosphorus desorption

Gypser

Schütze

Freese

2019

J. Plant Nutr. Soil Sci.

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In acidic soils, phosphorus availability is affected by its strong affinity for mineral surfaces, especially Fe‐ and Al‐hydroxides. Plant roots have developed adaptive strategies to enhance the availability of phosphorus, including producing and exuding low molecular weight organic acids with a high affinity for phosphorus that competes with high molecular weight organic ligands formed during humification and mineralization. The aim of this study was to characterize the kinetics and mechanism of phosphorus desorption from Fe‐ and Al‐hydroxides of variable crystallinity, as well as binary Fe:Al‐hydroxide mixtures. Long‐term desorption experiments (56 days) were conducted with CaCl2, CaSO4, citric acid, and humic acid as competitive sorptives. CaCl2 and CaSO4 were selected as general inorganic sorptives and citric and humic acids were selected as organic ligands produced by organisms in the rhizosphere or following humification. The cumulative phosphorus desorption increased following the order CaCl2 < CaSO4 < humic acid < citric acid. Amorphous ferrihydrite and Fe‐rich Fe:Al‐hydroxides exhibited much less desorption when exposed to inorganic solutions than the crystalline and Al‐rich Fe:Al‐hydroxide mixtures. Models of the desorption data suggest phosphorus desorption with citric acid is diffusion‐controlled for ferrihydrite and Fe‐rich amorphous Fe:Al‐hydroxides. When humic acid was the sorptive, metal‐organic complexes accumulated in the solution. The results suggest organic compounds, especially citric acid, are more important for liberating phosphorus from Fe‐ and Al‐minerals than inorganic ions present in the soil solution.

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Section: Discussionmentioning

confidence: 99%

Crystallization of single and binary iron‐ and aluminum hydroxides affect phosphorus desorption

Gypser

Schütze

Freese

2019

J. Plant Nutr. Soil Sci.

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“…In soils incubated with P up to 60 days, Kaloí et al (2011) observed that the longer the incubation time, the lower was P recovery, inversely proportional to the content or clay weathering degree. Duputel et al (2013) used data modeling to assess the effects of citrate sorption on P availability and observed more effective competition of citrate in weathered soils, in the absence of 2:1 minerals and predominance of goethite. In Oxisols, they observed that the mineral with highest citrate sorption was goethite, leading to increased negative charges, especially at lower pH.…”

Section: Incubation Time and Soil P Desorptionmentioning

confidence: 99%

“…Phosphorus sorption in the soil was reduced in the presence of organic acids (Andrade et al, 2003;Souza et al, 2006;Duputel et al, 2013). Organic acids can be retained in the soil with high energy and block P sorption sites (Haynes, 1984).…”

Section: Introductionmentioning

confidence: 98%

Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils

Souza

Soares²,

Silva³

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe increase of organic acids in soils can reduce phosphorus sorption. The objective of the study was to evaluate the competitive sorption of P and citrate in clayey and sandy loam soils, using a stirred-flow system. Three experiments were performed with soil samples (0-20 cm layer) of clayey (RYL-cl) and sandy loam (RYL-sl) Red Yellow Latosols (Oxisols). In the first study, the treatments were arranged in a 2 × 5 factorial design, with two soil types and five combinations of phosphorus and citrate application (only P; P + citrate; and citrate applied 7, 22, 52 min before P); in the second, the treatments were arranged in a 2 × 2 factorial design, corresponding to two soils and two forms of P and citrate application (only citrate and citrate + P); and in the third study, the treatments in a 2 × 2 × 6 factorial design consisted of two soils, two extractors (citrate and water) and six incubation times. In the RYL-cl and RYL-sl, P sorption was highest (44 and 25 % of P application, respectively), in the absence of citrate application. Under citrate application, P sorption was reduced in all treatments. The combined application of citrate and P reduced P sorption to 25.8 % of the initially applied P in RYL-cl and to 16.7 % in RYL-sl, in comparison to P without citrate. Citrate sorption in RYL-cl and RYL-sl was highest in the absence of P application, corresponding to 32.0 and 30.2 % of the citrate applied, respectively. With P application, citrate sorption was reduced to 26.4 and 19.7 % of the initially applied citrate in RYL-cl and RYL-sl, respectively. Phosphorus desorption was greater when citrate was used. Phosphorus desorption with citrate and water was higher in the beginning (until 24 h of incubation of P) in RYL-cl and RYL-sl, indicating a rapid initial phase, followed by a slow release phase. This suggests that according to the contact time of P with the soil colloids, the previously adsorbed P can be released to the soil solution in the presence of O aumento de ácidos orgânicos pode induzir à redução da sorção de P em solos. Este trabalho objetivou avaliar a sorção competitiva de P e citrato em solos de textura muito argilosa e franco-arenosa, utilizando o sistema de fluxo contínuo (stirred-flow). Foram realizados três experimentos com amostras da camada de 0-20 cm de dois Latossolos VermelhoAmarelo, texturas muito argilosa (LVA_arg) e franco-arenosa (LVA_fa). No primeiro, os tratamentos foram definidos por fatorial 2 × 5, sendo dois solos e cinco configurações de aplicação de P e citrato no solo (apenas P, P + citrato e citrato 7, 22, 52 min antes do P); no segundo, os tratamentos foram determinados por fatorial 2 × 2, dois solos e duas formas de aplicação de P e citrato no solo (apenas citrato, citrato + P); e, no terceiro, os tratamentos foram definidos segundo um fatorial 2 × 2 × 6, sendo dois solos, dois extratores (citrato e água) e os seis períodos de incubação. O valor máximo da sorção de P no LVA_arg e LVA_fa foi observado na testemunha sem aplicação de citrato, correspondendo a 44 e 25 % ...

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“…One common low molecular weight organic acid for increasing P solubility is citrate. However, there are conflicting results in the literature regarding the effectiveness of low molecular weight organic acids such as citrate on P solubilization (Geelhoed et al, 1998; Duputel et al, 2013a; Siciliano et al, 2016; Bulmer et al, 2018). Specifically, some studies of citrate–P interaction show that citrate additions enhance P mobility whereas sometimes P mobility is decreased (Bolan and Naidu, 1994; Gao et al, 2010; Duputel et al, 2013b; Siciliano et al, 2016).…”

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confidence: 99%

“…Specifically, some studies of citrate–P interaction show that citrate additions enhance P mobility whereas sometimes P mobility is decreased (Bolan and Naidu, 1994; Gao et al, 2010; Duputel et al, 2013b; Siciliano et al, 2016). For soils with a high clay content, the mechanism for the decrease in P mobility on citrate addition has been proposed to be an increase in negative surface charges, leading to an increase in the adsorption of Ca 2+ ions onto the clay minerals (Duputel et al, 2013a).…”

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confidence: 99%

Effects of Citrate on the Rates and Mechanisms of Phosphate Adsorption and Desorption on a Calcareous Soil

Bulmer

Hamilton

Kar

et al. 2019

Soil Science Soc of Amer J

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Citrate and Ca influence the P sorption in calcareous soil. Labile Ca influences the citrate‐enhanced P desorption. The soil P reactions obey the pseudo‐second‐order kinetics. P sorption in calcareous soil is Ca‐concentration dependent. Adsorption at the soil–water interface is a fundamental chemical process that often controls the retention of compounds in soils. The rates of adsorption therefore have a vital role in the fate and transport of phosphate in the soil environment. In this study, the effects of a range of organic acid (citrate) levels and soil Ca levels on phosphate (PO43−) adsorption and desorption were investigated in detail through a combination of laboratory (miscible displacement kinetics) and synchrotron‐based X‐ray absorption spectroscopy. A pseudo‐second‐order kinetics model was applied to the data that provided good fits for the entire datasets (both adsorption and desorption) with a single set of equations. In general, it was observed that citrate directly competed for adsorption sites in soils with reduced levels of Ca but in soils high in labile Ca, citrate was not competitive in desorbing P. The most likely explanation for this is that citrate instead chelates with Ca to form soluble complexes when an excess of Ca is present.

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Citrate adsorption can decrease soluble phosphate concentration in soil: Experimental and modeling evidence

Cited by 26 publications

References 66 publications

Crystallization of single and binary iron‐ and aluminum hydroxides affect phosphorus desorption

Crystallization of single and binary iron‐ and aluminum hydroxides affect phosphorus desorption

Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils

Effects of Citrate on the Rates and Mechanisms of Phosphate Adsorption and Desorption on a Calcareous Soil

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