Sedimentation rate of soil microparticles

Gomboš, Milan; Tall, Andrej; Trpčevská, Jarmila; Kandra, Branislav; Pavelková, Dana; Balejčíková, Lucia

doi:10.1007/s12517-018-4002-8

Cited by 8 publications

(9 citation statements)

References 24 publications

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“…Then, a 5 mL mixture was sucked from constant positions of the container at different times and immediately centrifuged. According to the Stokes equation (eq ), , 1 mL of dissolved Ce and suspended Ce samples were separated from the mixture by differential centrifugation at 4000 g and 10 000 g , respectively (Table S1, Supporting Information). Then, the dissolved Ce samples were filtered through a 0.45 μm hydrophilic filter membrane.…”

Section: Methodsmentioning

confidence: 99%

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Jiao

Dong

Xie

et al. 2021

Environ. Sci. Technol.

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The time-course association of soil physicochemical properties and fate of CeO 2 nanoparticles (NPs) is not well understood. This study for the first time investigated the dissolution and retention of CeO 2 NPs (<25 nm) during soil short-term (6 h) and long-term (30 d) aging processes with dynamic redox conditions. Under the additional reductant-induced initial reductive condition, theoretically, up to 220‰ of Ce(IV) was temporarily reductively dissolved within 10 min, accompanied by a slow retention process (180 min) of Ce species in soil solutions. Conversely, the dissolution and slow retention of Ce species were not significant in soil solutions without added reductant. Xray absorption near edge spectroscopy (XANES) shows that most of Ce species were present as Ce(IV) (94.0%−97.8%) in all soils after a long-term aging process. These results indicate that the soil dynamic redox conditions induced by oxidant/reductant intrinsically determined the different time-course dissolution and retention of CeO 2 NPs, highlighting the occasional reductive condition in soil solution that may contribute to the migration and diffusion of Ce species. The time-course study should be also adopted to develop a comprehensive understanding of the nano-soil interactions.

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Section: Methodsmentioning

confidence: 99%

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Jiao

Dong

Xie

et al. 2021

Environ. Sci. Technol.

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“…In additions, the coarse particle is rapidly sunk down to the bottom of collection tank, and it cannot be easily sampled. According to Stokes' rule [32] , the settling velocity of 0.5 mm particles is 6 times as fast as that of 0.2 mm particle. This maybe is one reason of the measured concentrations smaller than the designed concentrations.…”

Section: Effects Of Soil Typementioning

confidence: 99%

Measurement errors on sediment concentration from traditional runoff collection tanks and its correction possibility

Huang

Zhao

et al. 2019

International Journal of Agricultural and Biological Engineering

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Runoff plots are widely used worldwide to monitor water and soil losses. Sediment concentration in runoff collection tank is measured by stirring-sampling procedure, but this method may produce high measurement error due to the uneven mixing of collected sediments with water and soil particle deposition. This study aimed to identify the relationship between actual and measured sediment concentrations, so as to estimate the systematic error of sediment concentration measurement from runoff collection tank by traditional stirring-sampling procedure and the possibility to eliminate it. Four major soils including black soil, silt loess, clay loess, and purple soil in China were used to determine the correlation between the measured and designed sediment concentrations in laboratory.

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“…As HA b and HA I possessed more −OH/–COOH groups (Table ), their addition to the calcareous alkaline soil led to larger decreases in zeta potential. It could be explained that adding HA changed the original properties of the colloidal dispersion system due to the action of acid functional groups, thereby accelerating calcareous soil settlement …”

Section: Results and Discussionmentioning

confidence: 99%

“…According to Stokes' law, the settlement rate of soil particles is determined by the colloidal dispersion system. 38 It can be seen in Figure 6B that the A 665 values of the supernatants in the tubes with HA added decreased much more rapidly than those in CK and the tube with danty added. As for the three HA treatments, A 665 decreased most rapidly in HA b , followed by HA I and then HA c .…”

Section: Ha Characterizationmentioning

confidence: 87%

Humic Acid Extracted from Danty via Catalytic Oxidation Using H₂O₂/Birnessite: Characteristics and Agricultural Beneficial Effects

Zhang

Chen

et al. 2022

ACS Omega

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Extraction optimization is very important for the quality of humic acid (HA). In this study, actived HA (HA b ) was extracted from danty via catalytic oxidation using birnessite as a catalyst and H 2 O 2 as an oxidant. Single-factor experiments and the response surface method were used to optimize the acidic functional group content of HA b . It was found that the maximum acidic functional group content of HA b can be achieved when danty-crushing time, H 2 O 2 concentration, and birnessite dose were 105.7 min, 20, and 2%, respectively. Fourier transform infrared spectra showed that HA b had more surface functional groups than commercial HA (HA c ) and HA extracted using the traditional method of the International Humic Substances Society (HA I ). In addition, acidic functional group titration showed that HA b had 84.3% more acidic functional groups and 118.9% more carboxyl groups than HA I . Additionally, HA b had the greatest effect on promoting the dissolution of carbonate and bicarbonate, promoting the settlement of calcaline alkaline soil, and improving the germination rate of wheat seeds under saline and alkaline stress. This study provides a basis for the efficient extraction of active HA with rich functional groups and its application in agriculture and many other fields.

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Sedimentation rate of soil microparticles

Cited by 8 publications

References 24 publications

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Measurement errors on sediment concentration from traditional runoff collection tanks and its correction possibility

Humic Acid Extracted from Danty via Catalytic Oxidation Using H₂O₂/Birnessite: Characteristics and Agricultural Beneficial Effects

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Sedimentation rate of soil microparticles

Cited by 8 publications

References 24 publications

Dissolution and Retention Process of CeO2 Nanoparticles in Soil with Dynamic Redox Conditions

Dissolution and Retention Process of CeO2 Nanoparticles in Soil with Dynamic Redox Conditions

Measurement errors on sediment concentration from traditional runoff collection tanks and its correction possibility

Humic Acid Extracted from Danty via Catalytic Oxidation Using H2O2/Birnessite: Characteristics and Agricultural Beneficial Effects

Contact Info

Product

Resources

About

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Dissolution and Retention Process of CeO₂ Nanoparticles in Soil with Dynamic Redox Conditions

Humic Acid Extracted from Danty via Catalytic Oxidation Using H₂O₂/Birnessite: Characteristics and Agricultural Beneficial Effects