Herbicide mixtures affect adsorption processes in soils under sugarcane cultivation

Carneiro, Gabriella Daier Oliveira Pessoa; Souza, Matheus de Freitas; Lins, Hamurábi Anízio; Chagas, Paulo Sérgio Fernandes das; Silva, Tatiane Severo; Teófilo, Taliane Maria da Silva; Pavão, Quésia Sá; Grangeiro, Leílson Costa; Silva, Daniel Valadão

doi:10.1016/j.geoderma.2020.114626

Cited by 18 publications

(8 citation statements)

References 42 publications

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“…Generally, larger Kf-ads values correspond to higher sorption capacities (Carneiro et al 2020;Khorram et al 2018;Silva et al 2019). Here, the Kf-ads values of EPM ranged between 0.85 (in S4) and 32.22 (in S1) (mg 1-1/n L 1/n kg -1 ), while the 1/nf-ads values ranged between 0.80 (S1) and 1.06 (S5) (Table 1).…”

Section: Adsorption-desorption Isothermsmentioning

confidence: 73%

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Zhou

Jia

et al. 2021

Preprint

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(E)-Pyriminobac-methyl (EPM), a pyrimidine benzoic acid esters herbicide, has a high potential as weedicide; nevertheless, its environmental behaviors are still not well understood. In this study, we systematically investigated for the first time the adsorption–desorption, degradation, and leaching behaviors of EPM in agricultural soils from five exemplar sites in China (characterized by different physicochemical properties) through laboratory simulation experiments. The EPM adsorption–desorption results were well fitted by the Freundlich model (R2 > 0.9999). In the analyzed soils, the Freundlich adsorption (i.e., Kf-ads) and desorption (i.e., Kf-des) coefficients of EPM varied between 0.85–32.22 mg1−1/n L1/n kg−1 and between 0.78–5.02 mg1−1/n L1/n kg−1, respectively. Moreover, the degradation of EPM reflected first-order kinetics: its half-life ranged between 37.46–66.00 d depending on the environmental conditions, and abiotic degradation was predominant in the degradation of this compound. The mobility of EPM in the five soils varied from immobile to highly mobile. The groundwater ubiquity score ranged between 0.9765–2.7160, indicating that EPM posed threat to groundwater quality. Overall, the results of this study demonstrate the easy degradability of EPM, as well as its high adsorption affinity and low mobility in soils with abundant organic matter content and high cation exchange capacity. Under such conditions, there is a relatively low contamination risk for groundwater systems in relation to this compound. Overall, our findings provide a solid basis for predicting the environmental impacts of EPM.

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Section: Adsorption-desorption Isothermsmentioning

confidence: 73%

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Zhou

Jia

et al. 2021

Preprint

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“…The adjustment of atrazine adsorption data for PSO in RYO indicates a possible chemosorption between the adsorbent and the adsorbate. Chemosorption was also observed for diuron and hexazinone, photosystem II inhibiting herbicides, as well as atrazine, in two Brazilian oxisols [21]. This type of adsorption does not always occur for atrazine, as reported by where the PFO model was better to explain the adsorption of atrazine in an organic adsorbent [14].…”

Section: Adsorption Kineticsmentioning

confidence: 76%

Adsorption mechanisms of atrazine isolated and mixed with glyphosate formulations in soil

et al. 2020

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In Brazil, the atrazine has been applied frequently to join with glyphosate to control resistant biotypes and weed tolerant species to glyphosate. However, there are no studies about atrazine's behavior in soil when applied in admixture with glyphosate. Knowledge of atrazine's sorption and desorption mixed with glyphosate is necessary because the lower sorption and higher desorption may increase the leaching and runoff of pesticides, reaching groundwaters and rivers. Thereby, the objective of this study was to evaluate the adsorption mechanisms of atrazine when isolated and mixed with glyphosate formulations in a Red-Yellow Latosol. The maximum adsorbed amount of atrazine in equilibrium (qe) was not altered due to glyphosate formulations. The time to reach equilibrium was shortest when atrazine was mixed with the Roundup Ready® (te = 4.3 hours) due to the higher adsorption velocity (k2 = 2.3 mg min-1) in the soil. The highest sorption of atrazine occurred when mixed with the Roundup WG®, with the Freundlich sorption coefficient (Kf) equal to 2.51 and 2.43 for both formulation concentrations. However, other glyphosate formulations did not affect the sorption of atrazine. The desorption of atrazine was high for all treatments, with values close to 80% of the initial adsorbed amount, without differences among isolated and mixed treatments. The change in the velocity and capacity of sorption for the atrazine mixed with some glyphosate formulations indicates that further studies should be conducted to identify the mechanisms involved in this process.

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“…Generally, larger K f ads values correspond to higher sorption capacities (Carneiro et al, 2020;Khorram et al, 2018;Silva et al, 2019). Here, the K f ads values of EPM ranged between 0.85 (in S 4 ) and 32.22 (in S 1 ; mg 1−1/n L 1/n kg −1 ), while the 1/n f ads values ranged between 0.80 (S 1 ) and 1.06 (S 5 ; Table 1).…”

Section: Adsorption-desorption Isothermsmentioning

confidence: 82%

Environmental behaviors of (<i>E</i>) pyriminobac-methyl in agricultural soils

Zhou

Jia

et al. 2022

SOIL

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Abstract. E or pyriminobac-methyl (EPM), a pyrimidine benzoic acid esters herbicide, has a high potential as weedicide; nevertheless, its environmental behaviors are still not well understood. In this study, we systematically investigated, for the first time, the adsorption–desorption, degradation, and leaching behaviors of EPM in agricultural soils from five exemplar sites in China (Phaeozems – S1; Anthrosol – S2; Ferralsol – S3; Alisol – S4; Plinthosol – S5) through laboratory simulation experiments. Our results show that the EPM adsorption–desorption results were well fitted by the Freundlich model (R2>0.9999). In the analyzed soils, the Freundlich adsorption (i.e., Kf ads) and desorption (i.e., Kf des) coefficients of EPM varied between 0.85 and 32.22 mg1-1/n L1/n kg−1 and 0.78–5.02 mg1-1/n L1/n kg−1, respectively. The mobility of EPM in soils S1–S5 was categorized as immobile, slightly immobile, highly mobile, slightly mobile, and slightly mobile, respectively. Moreover, the degradation of EPM reflected first-order kinetics, where its half-life ranged between 37.46 and 66.00 d, depending on the environmental conditions, and abiotic degradation was predominant in the degradation of this compound. Overall, the high leaching ability and desorption capacity of EPM were accompanied by a low adsorption capacity, and there were no significant relationships between pH and the leaching rate of EPM in the five types of soils. In contrast, the organic matter content, cation exchange capacity, and soil clay content were the main components responsible for the observed leaching rates. We found that EPM degrades easily, has a high adsorption affinity, and a low mobility in S1, which results in a low contamination risk for groundwater systems. On the contrary, this compound degrades slowly in S2, S3, S4, and S5, due to a low adsorption affinity and moderate mobility, which results in a high contamination risk for groundwater systems. Therefore, our results may serve as a reference for evaluating the risks involved in the increasingly wide application of this compound.

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Herbicide mixtures affect adsorption processes in soils under sugarcane cultivation

Cited by 18 publications

References 42 publications

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Adsorption mechanisms of atrazine isolated and mixed with glyphosate formulations in soil

Environmental behaviors of (<i>E</i>) pyriminobac-methyl in agricultural soils

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Herbicide mixtures affect adsorption processes in soils under sugarcane cultivation

Cited by 18 publications

References 42 publications

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Environmental Behaviors of (E)-Pyriminobac-methyl in Agricultural Soils

Adsorption mechanisms of atrazine isolated and mixed with glyphosate formulations in soil

Environmental behaviors of (&lt;i&gt;E&lt;/i&gt;) pyriminobac-methyl in agricultural soils

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Environmental behaviors of (<i>E</i>) pyriminobac-methyl in agricultural soils