Zinc Binding to Fulvic acids: Assessing the Impact of pH, Metal Concentrations and Chemical Properties of Fulvic Acids on the Mechanism and Stability of Formed Soluble Complexes

Boguta, Patrycja; Sokołowska, Z.

doi:10.3390/molecules25061297

Cited by 44 publications

(23 citation statements)

References 83 publications

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“…7 D). This fact also indicates that BioC provided OM containing a high number of electron-donating substituents (like hydroxyl/methoxyl groups) for these HAs 70 . The probable sources of HA-like components were considered as autochthonous, terrestrial or soil OM, or microbial processes 68 .…”

Section: Resultsmentioning

confidence: 81%

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The influence of biochar on the content of carbon and the chemical transformations of fallow and grassland humic acids

Cybulak

Sokołowska

Boguta

2021

Sci Rep

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There is limited information regarding the effect of biochar (BioC) on the fertility of fallow and grassland soils, as well as on the properties of their humic acids (HAs). The objective of this study was to evaluate with a 3-year field experiment the influence of BioC on the organic matter (OM) in Haplic Luvisol. BioC (obtained via wood waste pyrolysis at 650 °C) was applied to the soil of subplots under fallow and grassland at doses of 0, 1, 2 and 3 kg m−2. The soil samples were collected eight times. The physicochemical properties were determined for the soil and BioC by analysing the density, pH, surface charge, ash, and organic carbon content. Based on the changes in the structure of the HAs and their quantity in the soils, the chemical properties of the HAs were determined. The maximum BioC dose caused an increase in the content of Corg and HAs. BioC did not influence the humification degree coefficients of the HAs originated from fallow, whereas in the grassland, there were significant changes observed in these coefficient values, indicating that BioC may stimulate and accelerate the humification process of soil HAs. Increasing the BioC doses caused an increase in the soil’s HA content, suggesting an increase in soil sorption capacity. The fluorescence data showed BioC addition to the soil caused an increase in the number of structures characterised by low molecular weight and a low degree of humification.

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Section: Resultsmentioning

confidence: 81%

“…At the same time, it should be noted that together with such HAs, fulvic acids can be formed. This fraction is also characterised by a low molecular weight and a low degree of humification 70 . This could be important information for future research that includes the fulvic acid fraction.…”

Section: Resultsmentioning

confidence: 99%

The influence of biochar on the content of carbon and the chemical transformations of fallow and grassland humic acids

Cybulak

Sokołowska

Boguta

2021

Sci Rep

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“…The quenching effect was strongest at the initial doses of copper (higher slope of the curve), where there were a large number of active sites that are now coordinating copper, thus forming complexes (Boguta et al, 2019;Mounier et al, 2011). In addition, the decrease of fluorescence contribution with increased metal concentration suggested the saturation of accessible sites, and the fact that the decay did not fall to zero is due to some fluorophores that did not participate in Cu(II) binding (Boguta et al, 2019;Boguta and Sokołowska, 2020). The proposed complexation model allowed the calculation of C L and K, where C L represents the concentration of binding sites available for interaction with Cu(II) ions and K is the conditional stability constant of the complex formed.…”

Section: Fluorescence Quenchingmentioning

confidence: 99%

“…The chelating properties of FA can either reduce toxicity when there is an excess of copper, or prevent it from precipitating as insoluble hydroxide, which renders it inaccessible to the plant (Boguta and Sokołowska, 2020;Bertoli et al, 2016;Stevenson, 1994). Tadini et al (2020) studied the interaction of copper with FA from Amazonian Spodosols.…”

Section: Introductionmentioning

confidence: 99%

Fulvic acids from Amazonian anthropogenic soils: Insight into the molecular composition and copper binding properties using fluorescence techniques

Santos

Fregolente

Mounier

et al. 2020

Ecotoxicology and Environmental Safety

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Fulvic acids (FA) are one of the components of humic substances and play an important role in the interaction with metallic species and, consequently, the bioavailability, distribution and toxicity of metals. However, only a few studies have investigated these FA properties in specific environment, such as anthropogenic soils. Therefore, knowledge about FA molecular composition as well as the FA-metal interaction is essential to predict their behavior in the soil. For this reason, the aim of this study was to investigate the molecular composition of FA extracted from two sites in an anthropogenic soil (Terra Mulata), from the Amazon region, as well as their interactions with Cu(II) ions as a model. Results from 13 C NMR, infrared and elemental analysis showed that these FA are composed mostly by alkyl structures and oxygenfunctional groups, e.g., hydroxyl, carbonyl and carboxyl. The interaction with Cu(II) ions was evaluated by fluorescence quenching, in which the FA showed both high quantity of complexing sites per gram of carbon and good affinity to interact with the metal when compared with other soil FA. The results showed that the complexation capacity was highly correlated by the content of functional groups, while the binding affinity was largely influenced by structural factors. In addition, through the lifetime decay given by time-resolved fluorescence, it was concluded that static quenching took place in FA and Cu(II) interaction with the formation of a non-fluorescent ground-state complex. Therefore, this fraction of soil organic matter will fully participate in complexation reactions, thereby influencing the mobility and bioavailability of metal in soils. Hence, the importance of the study, and the role of FA in the environment, can be seen especially in the Amazon, which is one of the most important biomes in the world.

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“…Fulvic acids compared to humic acids and humins reveal a structure richer in oxygen compounds, a lower sensitivity to pH, better solubility, lower molecular weight, and lower aromaticity. Fulvic acids, due to the large number of carboxylic, phenolic, and hydroxyl functional groups, show chelating properties, and they can play a key role in the mobility of metals [ 6 ]. According to Thurman, in groundwater, eighty-seven percent of dissolved organic substances (DOC) are fulvic acids, and only 13% are humic acids [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of the Oxidant Type on the Efficiency of the Oxidation and Removal of Iron Compounds from Groundwater Containing Humic Substances

Krupińska¹

2020

Molecules

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Due to the coexistence of organic matter and iron in groundwater, a certain part of the iron is present as iron-organic complexes in the form of colloids and/or dissolved complexes. The study was conducted to evaluate the impact of the type of oxidizing agent: O2, Cl2, H2O2, or KMnO4, on the efficiency of the oxidation and removal of iron compounds from three groundwaters with significantly different contents and types of organic substances among which humic and fulvic acids occurred. This study shows that after the aeration and the oxidation with Cl2 and H2O2, the increasing content of dissolved hydrophilic organic substances containing aromatic rings in the raw water reduced the effectiveness of Fe(II) oxidation and the effectiveness of iron removal during the sedimentation process. This regularity was not found only when KMnO4 was used as the oxidant. After oxidation with H2O2, the highest number of organo-iron complexes and an increased concentration of dissolved organic carbon were found. High concentrations of organo-ferrous connections were also found in aerated water samples. The highest KMnO4 efficiency of removing iron and organic substances and reducing the color intensity and turbidity was due to the catalytic and adsorptive properties of the precipitated MnO2, which also improved the sedimentation properties of the resultant oxidation products.

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Zinc Binding to Fulvic acids: Assessing the Impact of pH, Metal Concentrations and Chemical Properties of Fulvic Acids on the Mechanism and Stability of Formed Soluble Complexes

Cited by 44 publications

References 83 publications

The influence of biochar on the content of carbon and the chemical transformations of fallow and grassland humic acids

The influence of biochar on the content of carbon and the chemical transformations of fallow and grassland humic acids

Fulvic acids from Amazonian anthropogenic soils: Insight into the molecular composition and copper binding properties using fluorescence techniques

Impact of the Oxidant Type on the Efficiency of the Oxidation and Removal of Iron Compounds from Groundwater Containing Humic Substances

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