Clay and Soil Photolysis of the Pesticides Mesotrione and Metsulfuron Methyl

Siampiringue, Marie; Wong-Wah-Chung, Pascal; Koriko, Moursalou; Tchangbédji, Gado; Sarakha, Mohamed

doi:10.1155/2014/369037

Cited by 10 publications

(7 citation statements)

References 29 publications

(46 reference statements)

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“…The C=O stretching mode is shifted by 22cm −1 while the vibrational bands of quaternary carbon atom is shifted by ~90 cm −1 . Similar chemical shifts have been observed in previous studies on adsorption of ibuprofen and other organic compounds on clays and aluminosilicates (Madieh et al, 2007;Siampiringue et al, 2014). These vibrational shifts evidence the interactions between –COOH group of ibuprofen and silanol groups on clay surface during the formation of adsorption complexes of ibuprofen on clay particles.…”

Section: Resultssupporting

confidence: 88%

Abiotic degradation and environmental toxicity of ibuprofen: Roles of mineral particles and solar radiation

et al. 2018

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The growing medical and personal needs of human populations have escalated release of pharmaceuticals and personal care products into our natural environment. This work investigates abiotic degradation pathways of a particular PPCP, ibuprofen, in the presence of a major mineral component of soil (kaolinite clay), as well as the health effects of the primary compound and its degradation products. Results from these studies showed that the rate and extent of ibuprofen degradation is greatly influenced by the presence of clay particles and solar radiation. In the absence of solar radiation, the dominant reaction mechanism was observed to be the adsorption of ibuprofen onto clay surface where surface silanol groups play a key role. In contrast, under solar radiation and in the presence of clay particles, ibuprofen breaks down to several fractions. The decay rates were at least 6-fold higher for irradiated samples compared to those of dark conditions. Toxicity of primary ibuprofen and its secondary residues were tested on three microorganisms: Bacillus megaterium, Pseudoaltermonas atlantica; and algae from the Chlorella genus. The results from the biological assays show that primary PPCP is more toxic than the mixture of secondary products. Overall, however, biological assays carried out using only 4-acetylbenzoic acid, the most abundant secondary product, show a higher toxic effect on algae compared to its parent compound.

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Section: Resultssupporting

confidence: 88%

Abiotic degradation and environmental toxicity of ibuprofen: Roles of mineral particles and solar radiation

et al. 2018

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“…The natural soil organic matter can act, under sunlight excitation, as a photosensitizer through the generation of various oxygen species thereby accelerating the degradation of triketones. Although the inner filter effect, which may occur when an organic compounds is entrapped inside a soil particle, and photochemical quenching of electronically excited states by intramolecular energy transfer to various soil components, the induced degradation seemed to play a dominant role in photodegradation of triketones (Rasen et al 1997;Chan and Chu 2005;Menager and Sarakha 2013;Siampiringue et al 2014). …”

Section: Influence Of Soil and Sediment Ph On Triketones Stabilitymentioning

confidence: 99%

Degradation study of mesotrione and other triketone herbicides on soils and sediments

et al. 2015

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Purpose Triketone compounds are considered to be less stable in the ecosystems in comparison with other herbicides. However, their degradation processes in environment are under investigation as both parents and degradation products can exhibit toxicity on non-target organisms. The objective of this research was to investigate the degradation of triketone herbicides: mesotrione, sulcotrione, and tembotrione, as well as their degradation products in soils and sediments. Materials and methods The degradation studies were conducted in soil and sediment samples with different physicochemical properties. All experiments were conducted under standard experimental conditions; therefore, it was possible to assess the influence of pH, organic carbon (OC) content of soils and sediments, and the sunlight on the stability of triketones and their degradation products. The conditions of extraction and chromatographic determination were optimized for the determination of triketones and their degradation products in laboratory-spiked sediment and soil samples. Results and discussion The triketone degradation products exhibited higher stability in soil and sediment samples in comparison with parent herbicides. Soil microorganisms accelerated the degradation of all investigated compounds. In alkaline soil and sediments, all analytes exhibited higher stability in comparison with the acidic sorbents. The influence of OC content in sorbents was not evident. Photodegradation was the main path of triketones decomposition in soils and sediments. Conclusions Since the stability of triketone herbicides may be significant, depending on the environmental conditions, the monitoring of the concentration of these compounds and in particular their degradation products should be conducted under the field conditions.

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“…On the other hand, singlet oxygen (Hebert & Miller, ) and light in general (Frank et al, ) penetrate deeper in dry soil. In addition to its influence on the formation of reactive species, the presence of moisture, as suggested by Siampiringue et al (), may also alter the chemical environment of certain compounds (e.g., via stronger or weaker sorption), the diffusion of soluble compounds, and the reaction possibilities (e.g., likelihood of hydrolysis). As noted earlier, moisture was eliminated in the present study to avoid biological reactions as much as possible, and our results necessarily reflect what occurs in dry soils.…”

Section: Discussionmentioning

confidence: 99%

Exposure to Light Elicits a Spectrum of Chemical Changes in Soil

2019

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The significance of photochemically active solar radiation is well substantiated in Earth's air and water environments, but no broad connection has yet been ascertained between sunlight and the chemical properties of land surfaces. Since it is obvious that sunlight strikes Earth every day, an inquiry into this connection was made in a simple experiment with a diverse group of 20 soils. Light‐induced alteration of most of the major elements in soil was evident, including significant changes in dissolved organic carbon, inorganic nitrogen, pH, phosphorus availability and sorption capacity, and soluble and mineral forms of iron, manganese, aluminum, silicon, and calcium. In many instances the extent of these changes could be predicted from initial values. This broad response to light attests to the vivid photochemistry of soils and has both pedological and edaphological implications that reach beyond the surface. The phenomena reported here affirm the opportunity for novel inquiries into the chemistry of soils and land surfaces in general.

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Clay and Soil Photolysis of the Pesticides Mesotrione and Metsulfuron Methyl

Cited by 10 publications

References 29 publications

Abiotic degradation and environmental toxicity of ibuprofen: Roles of mineral particles and solar radiation

Abiotic degradation and environmental toxicity of ibuprofen: Roles of mineral particles and solar radiation

Degradation study of mesotrione and other triketone herbicides on soils and sediments

Exposure to Light Elicits a Spectrum of Chemical Changes in Soil

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