Distribution of heavy metals by the molecular-weight fractions of humic acids in the soils of long-term field experiments

Karpukhin, A. I.; Bushuev, N.N.

doi:10.1134/s1064229307030040

Cited by 6 publications

(4 citation statements)

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“…It was noted that high contamination can disturb the organic matter content and quality of soils: changes in the content of the aliphatic structures inhibit the maturation of molecules of humic acids (Grishina, Koptsik, and Makarov, 1990), increase the share of fulvic acids (Karpukhin and Bushuev, 2007), and even slightly increase the organic matter content (Bezuglova and Yudina, 2006). Hence, studies on native SOM quality changes and metal-SOM interactions are needed to better understand metal behaviors in the environment and implement repair strategies in different polluted soils.…”

Section: Soil Biologymentioning

confidence: 99%

Soil physical and chemical properties changes after zinc contamination

Bauer

Minkina

Пинский

et al. 2019

BioComm

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The aim of this work was to study the effect of a high rate of Zn on the chemical bond forms of metal in soil and on the physical properties and organic matter of Haplic Chernozem under model experiment conditions. The metal sequential extraction procedure used in this study was the classical five-step method proposed by Tessier et al. (1979). The particle size distribution was determined by the pipette method (using the pyrophosphate procedure of soil preparation) (GOST 12536-79). The microaggregate distribution was determined in the same way as the particle size distribution analysis above, except that there was no chemical dispersant (sodium pyrophosphate) applied (only mechanical agitation with water) (GOST 12536-79; Vadyunina and Korchagina, 1973). The qualitative composition of organic matter was determined using the Tyurin procedure modified by Ponomareva and Plotnikova (Vorob'eva, 2006). Contamination of Haplic Chernozem with Zn acetates at high rates of 2000 mg/kg affected the physical and chemical properties of the soil. A significant increase in the first two soil fractions least strongly bound to the soil was observed in contaminated soils. Silicates and Fe-Mn oxides made the largest contribution to the Zn adsorption and retention. The content of organo-mineral particles in colloidal size increased, which resulted in an increase of the clay fraction content up to 4.5 % compared to the control. The qualitative composition of organic matter changed: the contents of free and sesquioxide-bound humic acids and free fulvic acids increased. Studies of soil physical properties and organic matter quality changes and chemical bond forms of Zn in soil are needed to better understand metal behaviors in the environment and implement repair strategies in different polluted soils.

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Section: Soil Biologymentioning

confidence: 99%

Soil physical and chemical properties changes after zinc contamination

Bauer

Minkina

Пинский

et al. 2019

BioComm

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“…Soil organic matter (SOM) and its component humic acids (HAs), is one of the most important factors determining soil condition, such as fertility, buffer capacity, water-holding capacity, and also plays an essential role in the regulation of the climate on the planet [1,2]. A large number of works have been aimed at studying the composition and quality of the SOM of native and anthropogenically transformed soils [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Molecular Weight Distribution of Humic Acids Isolated from Calcic Cryosol in Central Yakutia, Russia

Polyakov,

Abakumov,

Lodygin

et al. 2024

Molecules

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The transition of soils into fallow state has a significant impact on the accumulation and transformation of soil organic matter (SOM). However, the issue of SOM transformation as a result of soil transition to fallow state in cryolithozone conditions is insufficiently studied. The aim of this study is to investigate the molecular weight (MW) distribution of humic acids (HAs) isolated from soils of central Yakutia. Native, fallow and agricultural soils in the vicinity of Yakutsk city were studied. MW distributions of HA preparations were obtained on an AKTAbasic 10 UPS chromatographic system (Amersam Biosciences, Uppsala, Sweden) using a SuperdexTM 200 10/300 GL column (with cross-linked dextran gel, fractionation range for globular proteins 10–600 kDa). The data on the molecular-mass distribution of HAs of fallow and agricultural soils of Central Yakutia were obtained for the first time. According to the obtained data, it was found that the highest carbon content in the structure of HAs was observed in agricultural soils (52.56%), and is associated with soil cultivation and fertilizer application. Among the HAs of fallow soils, we note that those soils that are in the process of self-vegetation have a relatively high carbon content in the HAs (45.84%), but the highest content was observed in fallow soils used as hayfields (49.98%), indicating that the reinvolvement of agriculture in fallow soils leads to an increase in the carbon content of HAs. According to the data of the MW distribution of HAs, it was found that the highest content of a high MW fraction of HAs was recorded in native soil (18.8%); this is due to the early stages of humification and the low maturity of organic matter. The highest content of a low MW fraction of HAs was recorded in agricultural soil (73.3%); this is due to the formation of molecular complexes of a “secondary” nature, which are more stable in the environment than the primary transformation products of humification precursors. The molecular composition of the HAs of fallow soils in the process of self-overgrowing is characterized by values closer to the HAs of native soils, which indicates their transformation towards HAs of native soils. The obtained results indicate that the reinvolvement of fallow soils leads to the transformation of the molecular composition of HAs towards HAs of agricultural soils, and to an increase in the resistance of SOM to biodegradation.

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“…Humic substances are mixtures of different acids, they have high variability and their composition often differs according to the location or soil horizon in which they are present. At low soil pH, humic substances are bound mainly in the form of organo-mineral complexes, which present a surface with different sorption characteristics than each of these components individually (Barančíková & Makovníková 2003;Karpukhin & Bushuev 2007). Humic substances retain heavy metals mainly by pH-dependent formation of inner-sphere and/ or outer-sphere complexes and cation exchange, doi: 10.17221/144/2014-SWR but the form and extent of binding is different for each metal (Christl et al 2001;Barančíková & Makovníková 2003;Gondar et al 2006).…”

mentioning

confidence: 99%

“…On the other side, the portion of Zn bound to humic substances is supposed to be relatively small compared to the other heavy metals. Zinc prefers sorption to the mineral fraction of soils and bonding is often expected as exchangeable (Gondar et al 2006;Karpukhin & Bushuev 2007).…”

mentioning

confidence: 99%

Sorption of heavy metals in organic horizons of acid forest soils at low added concentrations

Vytopilová¹,

Tejnecký²,

Borůvka³

et al. 2015

Soil & Water Res.

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Vytopilová M., Tejnecký V., Borůvka L., Drábek O. (2015): Sorption of heavy metals in organic horizons of acid forest soils at low added concentrations. Soil & Water Res., 10: 1-9.The individual adsorption/desorption of Cu, Pb, and Zn in six soil samples taken from organic horizons of acid forest soils is studied in batch experiments. These three metals were chosen because of the varying extent of their sorption to the soil organic matter. The initial concentration range for all metals is 0-200 mg/l. 0.01 mol/l Ca(NO 3 ) 2 was used as the background electrolyte. Soil samples were taken at random locations throughout a relatively small area and are characterized by small differences in mineralogical composition. Organic matter content and pH of soils are considered as the key factors causing differences in sorption/desorption behaviour of selected metals. In general, the sorption of all the three metals increased with a combination of higher pH value and increasing organic matter content. Anyway, the extent of the influence of these two characteristics on sorption behaviour of metals is different, for desorption significant differences were not determined. Copper sorption seems to reflect mainly the differences in organic matter content in addition to the differences in pH. The average amount of sorbed Pb was approximately 90%, Cu sorption averaged 60%, and that of Zn 30%. Desorption of Pb into 0.01 mol/l Ca(NO 3 ) 2 remained at approximately 4%, for Zn at 30%, and desorption of Cu reached up to 13% of the amount adsorbed. All the studied soils proved effective at immobilizing lead and copper, but zinc was relatively highly released from these soils, even when the sorbed amount was minimal. Different vegetational background of these samples (either beech or spruce forests) does not significantly influence the sorption extent of these metals as the lower pH of samples taken under spruce stands is probably compensated by higher organic matter content in these samples. The experimental data are fitted by the Freundlich equation and the parameters of this equation together with the adsorption and desorption efficiency are used for comparison of the behaviour of all the three metals among the six soils.

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Distribution of heavy metals by the molecular-weight fractions of humic acids in the soils of long-term field experiments

Cited by 6 publications

References 10 publications

Soil physical and chemical properties changes after zinc contamination

Soil physical and chemical properties changes after zinc contamination

Molecular Weight Distribution of Humic Acids Isolated from Calcic Cryosol in Central Yakutia, Russia

Sorption of heavy metals in organic horizons of acid forest soils at low added concentrations

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