Ion exchange properties of humus acids

Шоба, В. Н.; Чудненко, К. В.

doi:10.1134/s1064229314080110

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…The equilibria between organic matter and water are important mainly in water-saturated soils, in which they can affect the immobilization of pollutants as well as the transport of nutrients. − Active coefficients of the humic substances and solute can strongly influence these processes and has been the subject of several studies, ,− but the determination and analysis of activity coefficients of humic acids are really scarce. Collazo-Lopez et al determined the activity coefficients of nonpolar organic solutes in sedimentary organic matter and its different extractable fractions by means of gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

“…Shoba and Sen’kov determined the activity coefficients and the chemical potentials of ions and minerals in different soils on the basis of the physicochemical simulations and the data on the composition of the water extracts and soil solutions. Shoba and Chudnenko , studied the ion-exchange properties of humic acids. They developed the quantitative concepts of the composition and ion exchange between soil humic acids and cations of different valences.…”

Section: Introductionmentioning

confidence: 99%

“…Determinations of activity coefficients of humic substances are really sparse, and their values and concentration dependencies are usually unknown. Some authors , approximated the missing values by means of the physicochemical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of Their Behavior in Water Environment

Klučáková

2020

ACS Omega

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In this work, the dissociation of humic acids is investigated from the point of view of their mean activity coefficients. They are determined on the basis of two different concepts: sparingly soluble substance and multistep mechanism. It was found that the mean activity coefficients are generally higher, if the traditional concept is applied to the data, excepting the HA-A sample. Both the used concepts provide the mean activity coefficients dependent on the ionic strength, the amount of dissolved humic acids, and the types of electrolyte added in the studied suspensions. Their values based on the concept of a multistep mechanism and determined for humic acids in NaCl and NaI form a continuous curve and the individual character of their ions did not assert. It means that activity coefficients were affected only by the ionic strength and valence factor of the electrolytes irrespective of their chemical composition. The mean activity coefficients obtained for humic acids in HCl are lower in comparison with NaCl and NaI due to the common ion H+. Comparing the results obtained for individual humic acids, we can state that the results obtained for the HA-E sample are very different from those of other samples. It seems that its solubility is very high, but the majority of the dissolved particles remained in the molecular form and only a small amount of ions is formed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of Their Behavior in Water Environment

Klučáková

2020

ACS Omega

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Effects of Humic Acids in Chronic Lead Poisoning

Vašková

Krempaská

Žatko

et al. 2018

Biol Trace Elem Res

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Chronic exposure to lead causes disruption to energy production mechanisms and tissue damage, in particular through its binding to thiol groups and competition for zinc binding sites. We investigated the possibility of preventing the consequences of chronic lead poisoning by administration of three different doses of humic acids (HAs) into feed with the aim of establishing an effective HA dose. During the 10-week experiment, a sub-lethal dose of lead acetate was given to rats during the first 5 weeks, with continuous administration of HA over 10 weeks. Measurements were taken to determine the content of the metals Pb, Mn, Cu, Fe and Zn; the metalloid Se; and selected antioxidant markers in the heart, liver, kidney and plasma after the first, fifth and tenth weeks of experiment. The administration of lead and HAs clearly affects the redistribution of the elements and the activity of the antioxidant enzymes. This fact was particularly highlighted in the lead-only group as, within the experiment, significantly higher Pb concentrations were found only in the plasma of this group. However, in the group with 1% HA administered with lead, we observed a rise in Zn concentrations in the organs and the deposition of Fe into the liver. Decreased glutathione reductase activity in the plasma and balanced reduced glutathione concentrations indicated sufficient efficiency of redox reactions. SOD activities were among those affected most strongly, with only the 1% HA group showing no effect on heavy metal redistribution as a result of HA administration.

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Mitigation of Huanglongbing: Implications of a Biologically Enhanced Nutritional Program on Yield, Pathogen Localization, and Host Gene Expression Profiles

et al. 2023

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Huanglongbing (HLB, citrus greening disease) is the most destructive disease affecting citrus production and is primarily linked to the gram-negative, insect-vectored, phloem-inhabiting α-proteobacterium, ‘Candidatus Liberibacter asiaticus’ (CLas). With no effective treatment available, management strategies have largely focused on the use of insecticides in addition to the destruction of infected trees, which are environmentally hazardous and cost-prohibitive for growers, respectively. A major limitation to combating HLB is the inability to isolate CLas in axenic culture, which hinders in vitro studies and creates a need for robust in situ CLas detection and visualization methods. The aim of this study was to investigate the efficacy of a nutritional program-based approach for HLB treatment, and to explore the effectiveness of an enhanced immunodetection method to detect CLas-infected tissues. To achieve this, four different biostimulant-augmented nutritional programs (P1, P2, P3 and P4) were tested on CLas-infected citrus trees. Structured illumination microscopy (SIM) preceded by a modified immuno-labeling process and transmission electron microscopy (TEM), were used to show treatment-dependent reduction of CLas cells in phloem tissues. No sieve pore plugging was seen in the leaves of P2 trees. This was accompanied by an 80% annual increase in fruit number per tree and 1,503 (611 upregulated and 892 downregulated) differentially expressed genes. These included an MLRQ subunit gene, UDP-glucose transferase, and genes associated with the alpha-amino linolenic acid metabolism pathway in P2 trees. Taken together, the results highlight a major role for biostimulant-amended nutritional programs as a viable, sustainable and cost-effective option for HLB management.

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Ion exchange properties of humus acids

Cited by 5 publications

References 12 publications

Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of Their Behavior in Water Environment

Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of Their Behavior in Water Environment

Effects of Humic Acids in Chronic Lead Poisoning

Mitigation of Huanglongbing: Implications of a Biologically Enhanced Nutritional Program on Yield, Pathogen Localization, and Host Gene Expression Profiles

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