Adsorption-desorption and leaching behavior of diuron on selected Kenyan agricultural soils

Muendo, Boniface M.; Shikuku, Victor Odhiambo; Getenga, Zachary; Lalah, Joseph O.; Wandiga, Shem O.; Rothballer, Michael

doi:10.1016/j.heliyon.2021.e06073

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…The adsorption process was characterized by employing the Langmuir equation [ 49 ]: Q e = kQ max C e (1+kC e ) and the Freundlich equation [ 50 , 51 ]: Q e = aC e 1/n , where Q e (mg kg −1 ) represents the equilibrium P adsorption capacity of soil at a given P concentration C e (mg L −1 ), Q max (mg kg −1 ) denotes the maximum P adsorption capacity of soil, and k (L mg −1 ) signifies the binding strength constant for P at the adsorption site. Furthermore, k·Q max is defined as the maximum buffer capacity for phosphorus adsorption (MBC, L kg −1 ).…”

Section: Methodsmentioning

confidence: 99%

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Study on vertical variation characteristics of soil phosphorus adsorption and desorption in black soil region of Northeast China

Zhao,

Xie,

et al. 2024

PLoS ONE

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The adsorption and desorption of phosphorus (P) in soil constitute a crucial internal cycle that is closely associated with soil fertility, exerting direct influence on the quantity, form, and availability of P within the soil. The vertical spatial variation characteristics of soil adsorption and desorption were investigated for the 0–100 cm soil layer in the northeast black soil region in this study. The maximum adsorption capacity (Qmax) and maximum adsorption buffer capacity (MBC) of black soil in the study area ranged from 313.8 to 411.9 mg kg-1 and from 3.1 to 28.8 L kg-1, respectively, within the soil layer of 0–100 cm depth, exhibiting an increasing trend with greater soil depth. The degree of P adsorption saturation (DPS) exhibited a contrasting trend with the variations in Qmax and MBC, ranging from 3.8% to 21.6%. The maximum desorption capacity (Dmax) and desorption rate (Dr) of soil P ranged from 112.8 to 215.7 mg kg-1 and 32.1% to 52.5%, respectively, while the readily desorbable P (RDP) in soil was within the range of 1.02 to 3.35 mg kg-1. Both Dmax, Dr, and RDP exhibited a decreasing trend with increasing soil depth before showing an upward trend. These research findings not only provide essential background data for the systematic investigation of soil P in the black soil region but also serve as a valuable reference for assessing soil quality in this area.

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Section: Methodsmentioning

confidence: 99%

“…The adsorption process was characterized by employing the Langmuir equation [49]: Q e = kQ max C e (1+kC e ) and the Freundlich equation [50,51]:…”

Section: Statistical Analysesmentioning

confidence: 99%

Study on vertical variation characteristics of soil phosphorus adsorption and desorption in black soil region of Northeast China

Zhao,

Xie,

et al. 2024

PLoS ONE

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“…In Brazil, diuron is recommended for coffee, sugar cane, cotton, and citrus crops and controls both dicotyledons and monocotyledons in pre-and post-emergence of weeds [5][6][7][8]. Diuron has a non-ionic and neutral octanol-water partition coefficient (K ow = 2.87) and sorption coefficient normalized by soil organic carbon (OC) content (K oc = 680 L kg −1 ) [9].…”

Section: Introductionmentioning

confidence: 99%

Cucumber Bioassay and HPLC Analysis to Detect Diuron Residues in Remineralized Soils Following Canavalia ensiformis Cultivation as a Phytoremediator

Araujo,

da Silva,

Vaz

et al. 2023

Horticulturae

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The aim of this study was to evaluate the role of rock powder in the phytoremediation of Inceptisol (sandy loam) and Oxisol (clay) contaminated with diuron. Canavalia ensiformis plants were grown in pots containing 7.5 kg of both soils, with doses of 0, 4, and 8 t ha−1 of rock powder. Diuron was applied in doses ranging from 875 to 3500 g of a.i. ha−1. The injury level was assessed at 42 days after emergence (DAE), and the morphological characteristics were assessed at 120 DAE. After phytoremediation, the soil was analyzed using High Performance Liquid Chromatography (HPLC) and by bioassay with cucumber (Cucumis sativus) to detect diuron. In Oxisol, no injury was observed, and the rock powder (4 t ha−1) benefited the growth of C. ensiformis regardless of the dose of diuron. In Inceptisol, the greatest reduction in growth occurred with 3500 g a.i. ha−1 of diuron and 8 t ha−1 of rock powder. Diuron was detected after 120 days in Inceptisol with 2625 g a.i. ha−1 without rock powder and 3500 g a.i. ha−1 with and without rock powder. The cucumber bioindicator in Inceptisol showed an increase in the level of injury as the dose of diuron increased. The rock powder favored the growth of C. ensiformis and was able to phytoremediate high concentrations of diuron, which supports the safe use of this herbicide for weed control, minimizing environmental impacts.

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“…According to the European Food Safety Authority, acceptable daily intake (ADI) of DCMU is 0.007 mg/kg bw/day, whereas acute reference dose (ARfD) is 0.016 mg/kg bw/day. Occupational exposure is one of the main concerns about this herbicide, mainly through pollution of both soil and water (8)(9)(10)(11)(12). However, this herbicide is also responsible for a high number of acute intoxications, voluntary or not, which lead to long-term consequences for poisoned persons (13,14).…”

Section: Introductionmentioning

confidence: 99%

The DCMU Herbicide Shapes T-cell Functions By Modulating Micro-RNA Expression Profiles

et al. 2022

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DCMU [N-(3,4-dichlorophenyl)-N-dimethylurea] or diuron is a widely used herbicide, which can cause adverse effects on human, especially on immune cells, due to their intrinsic properties and wide distribution. These cells are important for fighting not only against virus or bacteria but also against neoplastic cell development. We developed an approach that combines functional studies and miRNA and RNA sequencing data to evaluate the effects of DCMU on the human immune response against cancer, particularly the one carried out by CD8+ T cells. We found that DCMU modulates the expression of miRNA in a dose-dependent manner, leading to a specific pattern of gene expression and consequently to a diminished cytokine and granzyme B secretions. Using mimics or anti-miRs, we identified several miRNA, such as hsa-miR-3135b and hsa-miR-21-5p, that regulate these secretions. All these changes reduce the CD8+ T cells’ cytotoxic activity directed against cancer cells, in vitro and in vivo in a zebrafish model. To conclude, our study suggests that DCMU reduces T-cell abilities, participating thus to the establishment of an environment conducive to cancer development.

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Adsorption-desorption and leaching behavior of diuron on selected Kenyan agricultural soils

Cited by 19 publications

References 25 publications

Study on vertical variation characteristics of soil phosphorus adsorption and desorption in black soil region of Northeast China

Study on vertical variation characteristics of soil phosphorus adsorption and desorption in black soil region of Northeast China

Cucumber Bioassay and HPLC Analysis to Detect Diuron Residues in Remineralized Soils Following Canavalia ensiformis Cultivation as a Phytoremediator

The DCMU Herbicide Shapes T-cell Functions By Modulating Micro-RNA Expression Profiles

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