Insight into the mechanism of low molecular weight organic acids-mediated release of phosphorus and potassium from biochars

Zhang, Huiying; Li, Qingyang; Zhang, Xia; Chen, Weifeng; Ni, Jinzhi; Yang, Liuming; Wei, Ran

doi:10.1016/j.scitotenv.2020.140416

Cited by 30 publications

(17 citation statements)

References 52 publications

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“…Pyrolysis degrade the organic P present in the SS on inorganic, which is again associated predominantly with Fe (due to its high content), but also with Al and Ca (Huang et al 2017). As stated by Zhang et al (2020), deprotonated citric acid is polyvalent anions able to exchange with P in biochar with a high ratio of trivalent metals to P, such as Fe 3+ in this case. Conversely, Khademi et al (2009) and Ström et al (2005) found that oxalate was slightly more effective than citrate in mobilizing P from calcareous soils.…”

Section: Phosphorus Release With the Lmwoasmentioning

confidence: 76%

“…These organic acid anions can therefore solubilize P from mineral surfaces either by ligand exchange or by ligand-promoted dissolution (Oburger et al 2011). In the case of biochars, the effect of LMWOAs on the release of P is dominated by the molecular structure of LMWOAs, the dissociation degree of LMWOAs, and the mineral element stoichiometric ratio of biochars (Zhang et al 2020). However, the informations concerning the role of LMWOAs in the release of P from biochars are still limited.…”

Section: Introductionmentioning

confidence: 99%

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The role of low molecular weight organic acids in the release of phosphorus from sewage sludge-based biochar

et al. 2021

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Low molecular weight organic acids (LMWOAs) are common and abundant compounds in the environment, responsible for the release of the nutrients from rhizosphere into the soil solution and, therefore, facilitating the availability of these nutrients for plants. Sewage sludge biochar (SSB) is considered to be a potential source of phosphorus (P) in soil. In this context, the efficacy of twelve LMWOAs in releasing SSB-bearing P was tested in a laboratory extraction experiment. Moreover, the potential effects of (i) biochar pyrolysis temperature (varying from 220°C to 620°C) and (ii) other elements in SS, to estimate the P bonds attacked predominantly by the LMWOAs, were also assessed. The results revealed citric acid was the most effective extraction agent enhancing the mobility of the SSB-derived P. P release was strongly affected by biochar pyrolysis temperature (the highest P release was from the 320°C biochar, significant at p < 0.05). Moreover, the results showed that P was released preferably from Fe-P bearing compounds in SS. Citric acid was recorded as less effective at releasing other nutrients, such as Ca, Mg, K, indicating the exceptional performance of citric acid in P release from biochar without substantial effect on the other nutrients.

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Section: Phosphorus Release With the Lmwoasmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

The role of low molecular weight organic acids in the release of phosphorus from sewage sludge-based biochar

et al. 2021

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“…As expected, the pH reduction was lowest in highly calcareous soil (21.5% free CaCO 3 ). After adding organic acids, the soil's pH was substantially lower than the pH of the native soil, allowing phosphorus to be released from the cation complex more easily (Zhang et al, 2020). Citric acid appears to be a more potent extracting agent than all other organic acids due to three hydroxyl groups (Lazo et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Solubilization of phosphorus by low molecular weight organic acids and amino acids in calcareous soils

Brindhavani

Chitdeshwari

Selvi

et al. 2022

JANS

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In order for plants to perform well in nutrient-deficient calcareous soils, they have an efficient adaptive technique of root exudate secretion, which contains low molecular weight organic acids. They enhance nutrient release and thereby increase the nutrient availability in calcareous soils. The present study aimed to investigate the effect of concentration and time of incubation of low molecular weight organic acids on P solubilization from calcareous soils collected from various locations of Coimbatore district with varying levels of calcareousness. An incubation experiment was conducted with five calcareous soils with varying levels of free CaCO3 viz., (1, 7.5, 12.5, 17.5 & 21.5%) by incubating with seven different concentrations (0, 20, 40, 60, 80 & 100 mM) of four organic (citric, malic, oxalic and acetic acid) and two amino acids (glycine and lysine) for nine incubation time intervals (5, 10, 20, 30, 60, 120, 240, 960 & 1440 mins) on a factorial experiment based on completely randomized design (CRD). Available P was analyzed to find the solubilization efficiency of various organic and amino acids. The organic acids were more efficient when compared to amino acids in P solubilization, especially citric acid followed by oxalic and malic acids, at 100 mM concentration incubated for 1440 mins. Also, the solubilization increased with increasing concentration and incubation time, irrespective of the soil calcareousness, but the magnitude of phosphorus extraction decreased with increasing soil calcareousness. Incubating the calcareous soils with 100 mM of citric acid for 1440 min solubilized more amount of phosphorus. Hence it can be concluded that addition of 100 mM citric acid will influence the phosphorus release even from highly calcareous soils.

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“…Low molecular weight organic acids (LMWOAs, < 900 Da) are one of the most active organic components in soil solutions, mainly from plant residues, root exudates and microbial metabolites (Zhang et al 2020a). The life cycle of LMWOAs in the soil is normally short (several hours), the concentration is relatively low (ranging from a few to tens of millimoles), and the concentration may even decrease by 1-2 orders of magnitude due to the process of biodegradation, migration, rainfall, and irrigation.…”

Section: Introductionmentioning

confidence: 99%

“…The formation, migration, transformation, adsorption, and biodegradation of LMWOAs play an important role in the global carbon cycle. In addition, LMWOAs are involved in mineral transformation, dissolution, and the fixation and migration of metal elements such as iron, aluminum, cadmium, arsenic, and so on (Qin et al 2020;Wang et al 2014), the biodegradation of organic contaminants such as polycyclic aromatic hydrocarbons and petroleum hydrocarbons (Sun et al 2016;Martin et al 2014), phosphorus, potassium and other nutrient elements release (Zhang et al 2020a). The LMWOAs influence the large geological cycle of chemical elements, the immobilization of nutrients and pollutants in the soil, stimulating or inhibiting the growth and development of plants.…”

Section: Introductionmentioning

confidence: 99%

Effects of low molecular weight organic acids on aggregation behavior of biochar colloids at acid and neutral conditions

Wang

Xiong

et al. 2022

Biochar

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Low molecular weight organic acids (LMWOAs), as active components in the rhizosphere carbon cycling, may influence the environmental behaviors of biochar colloids. This study selected the pine-wood and wheat-straw biochars (PB and WB) as two typical biochars. The effects of typical LMWOAs (oxalic acid, citric acid, and malic acid) on aggregation kinetics of PB and WB colloids were investigated under pH 4 and 6 conditions. Critical coagulation concentrations (CCCs) of both PB and WB colloids were decreased with the LMWOAs regardless of the types of biochar and the solution pH, and the most significant effect occurred in pH 4 due to more LMWOAs sorption on the biochar colloids. The different types of LMWOAs caused various CCCs changes. For example, the CCC values of PB colloids decreased from 75 mM to 56, 52, and 47 mM in the pH 4 NaCl solutions when 1 mM oxalic acid, citric acid, and malic acid were present in the suspensions, respectively. The chemical structure (functional groups) and molecular weight of LMWOAs, solution pH, and the electrophoretic mobility (EPM) of biochar co-influence the interactions between biochar colloids and LMWOAs, thus affecting the stability of biochar colloids in the presence of LMWOAs. The presence of LMWOAs accelerated the aggregation of colloidal biochar by increasing the interaction of surface bridging bonds (hydrogen bonding) and decreasing the repulsive force between colloidal biochar particles. This study showed that LMWOAs could accelerate the aggregation of biochar colloids in acidic or neutral environments and reduce the mobility of biochar colloids in soil rhizosphere.

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Insight into the mechanism of low molecular weight organic acids-mediated release of phosphorus and potassium from biochars

Cited by 30 publications

References 52 publications

The role of low molecular weight organic acids in the release of phosphorus from sewage sludge-based biochar

The role of low molecular weight organic acids in the release of phosphorus from sewage sludge-based biochar

Solubilization of phosphorus by low molecular weight organic acids and amino acids in calcareous soils

Effects of low molecular weight organic acids on aggregation behavior of biochar colloids at acid and neutral conditions

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