Influence of humic substances on phosphate adsorption by aluminium and iron oxides

Borggaard, Ole K.; Raben‐Lange, B.; Gimsing, Anne Louise; Strobel, Bjarne W.

doi:10.1016/j.geoderma.2004.12.011

Cited by 257 publications

(112 citation statements)

References 28 publications

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“…6a) underlines the high affinity of phosphate for surface hydroxyl sites of the am-Al(OH) 3 . Similarly, Borggaard et al (2005) showed that phosphate sorption by am-Al(OH) 3 was not affected even at high concentrations of humic acids, thus highlighting the strong competitiveness of phosphate compared with OM. Obviously, solution phosphate can become a major factor in determining the microbial stability of sorbed OC if few mineral sites are available (Figs.…”

Section: à2mentioning

confidence: 91%

Sorptive stabilization of organic matter by amorphous Al hydroxide

Schneider

Scheel

Mikutta

et al. 2010

Geochimica et Cosmochimica Acta

115

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Sorptive stabilization of organic matter by amorphous Al hydroxideSchneider, M.P.W.; Scheel, Th.; Mikutta, R.; van Hees, P.; Kaiser, K.; Kalbitz, K. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ) with OM extracted from organic horizons under a Norway spruce and a European beech forest. The stabilization of OM by sorption was analyzed by comparing the CO 2 mineralized during the incubation of sorbed and non-sorbed OM. The mineralization of OM was evaluated based in terms of (i) the availability of the am-Al(OH) 3 , thus surface OM loadings, (ii) spectral properties of OM, and (iii) the presence of phosphate as a competitor for OM. This was done by varying the solid-to-solution ratio (SSR = 0.02-1.2 g L À1 ) during sorption. At low SSRs, hence limited am-Al(OH) 3 availability, only small portions of dissolved OM were sorbed; for OM from Oa horizons, the mineralization of the sorbed fraction exceeded that of the original dissolved OM. The likely reason is competition with phosphate for sorption sites favouring the formation of weak mineral-organic bindings and the surface accumulation of N-rich, less aromatic and less complex OM. This small fraction controlled the mineralization of sorbed OM even at higher SSRs. At higher SSRs, i.e., with am-Al(OH) 3 more available, competition of phosphate decreased and aromatic compounds were sorbed selectively, which resulted in pronounced resistance of sorbed OM against decay. The combined OC mineralization of sorbed and non-sorbed OM was 12-65% less than that of the original DOM. Sorbed OM contributed only little to the overall OC mineralization. Stabilization of OC increased in direct proportion to am-Al(OH) 3 availability, despite constant aromatic C ($30%). The strong stabilization at higher mineral availability is primarily governed by strong Al-OM bonds formed under less competitive conditions. Due to these strong bonds and the resulting strong stabilization, the surface loading, a proxy for the mineral's occupation by OM, was not a factor in the mineralization of sorbed OM over a wide range of C sorption (0.2-1.1 mg C m À2). This study demonstrates that sorption to am-Al(OH) 3 results in stabilization of OM. The mineral availability as well as the inorganic solution chemistry control sorptive interactions, thereby th...

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Section: à2mentioning

confidence: 91%

Sorptive stabilization of organic matter by amorphous Al hydroxide

Schneider

Scheel

Mikutta

et al. 2010

Geochimica et Cosmochimica Acta

115

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“…5). HA adsorbs to Fe oxydroxides via ligand exchange or H-bonding with carboxyl/hydroxyl groups, association with aliphatic or aromatic carbon, and electrostatic interactions (Borggaard et al, 2005;Fein et al, 1999;Gu et al, 1994;Tipping, 1981;Yang et al, 2013). Adsorbed HA concentration (q) was found to increase with increasing dissolved HA concentration (Ceq) at low HA concentration range but levelled off at high HA concentration range (Fig.…”

Section: Ha Adsorption To Quartz Sand and Fe Coated Sand And Its Inflmentioning

confidence: 99%

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

Cheng

2016

Science of The Total Environment

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Influence of humic acid (HA) on stability and attachment of nTiO2 particles to sand was investigated. Results showed that HA can either promote or hinder nTiO2 stability, depending on pH and HA concentration. HA can either enhance or reduce nTiO2 attachment to Fe oxyhydroxide coating at pH 5, depending on HA concentration.Results further showed that at pH 5, Fe oxyhydroxide coating reduced nTiO2 attachment to sand in the absence of HA but increased nTiO2 attachment in the presence of low concentration of HA. Derjaguin-Landau-Verwey-Overbeek (DLVO) theory was invoked to analyze particle-to-particle and particle-to-sand interactions in order to elucidate the roles of pH, HA, quartz, and Fe coating in controlling nTiO2 stability and attachment. Overall, this study showed that changes in zeta potential of nTiO2 and Fe coating due to pH changes and/or HA adsorption are the key factors that influence stability and attachment of nTiO2.iii ACKNOWLEDGEMENTS

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“…P forms in the fertilisers that are soluble in water are in principle high available to plants. Nevertheless, the soluble P in soil solution could undergo rapid immobilisation by sorption onto soil mineral surfaces (oxi-hydroxides of Fe and Al, clay minerals and calcite), or by incorporation into soil metal-organic matter complexes (Gerke and Hermann, 1992;Matar et al, 1992;Frossard et al, 1995;Torrent, 1997;Borggaard et al, 2004). So, the concentration of orthophosphate-P in the soil solution is basically controlled by adsorption/ desorption and precipitation/dissolution processes and also by the immobilisation and mineralisation of organic P forms.…”

Section: Phosphorus Forms and P Phytoavailability In Fertilisersmentioning

confidence: 99%

Sustainability of phosphorus fertilisation: sources and forms of phosphate

Horta¹

2015

Rev. Ciênc. Agr.

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A B S T R A C TPhosphorus (P), which originates from a non-renewable natural resource, is essential for crop productivity, food security and human health. Despite being a finite resource its use has been increasing consistently over the last few decades. The major use of the phosphate rock is the manufacture of P fertiliser, agriculture also being the main source for nonpoint source P pollution, which causes the eutrophication of water bodies. Thus, there is great need for a sustainable use of P with special attention to agricultural use, namely P fertilisation. This paper explores P sources and forms that could be phytoavailable and hence used as fertilisers. Current trends in phosphorus fertilisation are also discussed with a focus on approaches to net decrease in phosphate rock exploitation and closure of phosphorous cycle use.Keywords: eutrophication, fertilisers, phosphate rock, soil test phosphorus, struvite R E S U M OO fósforo (P) provém de um recurso natural não renovável e é indispensável para a produtividade agrícola, segurança alimentar e saúde humana. Apesar de ser um recurso finito o seu consumo tem vindo a crescer nas últimas décadas. O principal uso da rocha fosfatada é a produção de adubos fosfatados sendo também a atividade agrícola, a principal fonte de P de origem difusa que causa a eutrofização dos cursos de água. Estes factos enfatizam a necessidade do uso sustentá-vel do P com especial atenção no seu uso agrícola, em particular na fertilização fosfatada. Este artigo aborda as origens e as formas de P que podem ser fitodisponíveis e, deste modo usadas como fertilizantes. São também apresentadas as atuais tendências para uma fertilização fosfatada sustentável, com referência a algumas práticas e tecnologias para alcançar não só uma real diminuição na exploração das rochas fosfatadas, com também para fechar o ciclo de utilização do fósforo.Palavras-chave: eutrofização, fertilizantes, métodos de quantificação do fósforo, rocha fosfatada, struvite History and evolution of phosphorus fertilisationPhosphorus (P) is an essential nutrient for living beings making up about 0.2% of a plant's dry weight. P enters in the food chain taken up by plant roots from soil solution. P is a component of key molecules such as nucleic acids, phospholipids, and ATP. Therefore is a component of many cell constituents and plays a major role in several key processes, including photosynthesis, respiration, and energy storage and transfer, cell division, and cell enlargement (Marschner, 1995;Schachtman et al., 1998). In addition to other functions animals also require P for bones and teeth and derive their phosphorus needs from plant products and feed supplements. Thus, an adequate soil P level is essential not only for crop production but also for food security and human health.

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Influence of humic substances on phosphate adsorption by aluminium and iron oxides

Cited by 257 publications

References 28 publications

Sorptive stabilization of organic matter by amorphous Al hydroxide

Sorptive stabilization of organic matter by amorphous Al hydroxide

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

Sustainability of phosphorus fertilisation: sources and forms of phosphate

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