Effect of the Incorporation of Sugarcane Bagasse Biochar in Leaching and Bioavailability of Clomazone in Soil (original) (raw)
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Anais da Academia Brasileira de Ciências
Biochar is a carbonaceous material that has excellent potential as a fertilizer and soil conditioner. However, there is a lack of information concerning the effects of the amount and particle size of this pyrogenic material on the soil sorption capacity. In this work, evaluation was made of changes in clomazone (CMZ) sorption in a Red Latosol following soil conditioning using different percentages (0.25, 0.5, and 1% w/w) of sugarcane biochar in three particle sizes (<106, 106-508, and 508-610 µm). The conditioned soils presented apparent sorption coefficients (K d) up to 1300 times higher than that of pure soil, besides changes in the behavior of CMZ sorption. The biochar particle size and percentage influenced sorption of the herbicide as well as its retention in the amended soil during desorption processes. Both sorption and desorption Freundlich constants were linearly correlated with the external surface area of the biochar present in the soil.
Influence of Formulation on Mobility of Clomazone in Soil
Bulletin of Environmental Contamination and Toxicology, 2016
The mobility of clomazone [2-(2-chlorobenzylo)-4,4-dimetylo-1,2-oxazolidin-3-one] in a loamy sand soil and a sand soil was studied in a soil column under laboratory conditions. Commercial clomazone formulation (Command 480 EC) and clomazone immobilized in an alginate matrix were used for a leaching experiment. For both formulations, the same dose of 2.0 mg of the active substance was applied. After an application of a herbicide, the columns were irrigated with: 100, 40 and 3.7 mm of water. After 1 h, when an addition of water was completed, the soils were sampled in the 5 cm segments and were used for the analysis of the residues. The use of an alginate formulation reduced the vertical mobility of clomazone into a soil layer in comparison with the formulation EC.
The behavior of clomazone in the soil environment
Pest Management Science, 2009
BACKGROUND: Clomazone is a herbicide used to control broadleaf weeds and grasses. Clomazone use in agriculturally important crops and forests for weed control has increased and is a potential water contaminant given its high water solubility (1100 µg mL −1 ). Soil sorption is an environmental fate parameter that may limit its movement to water systems. The authors used model rice and forest soils of California to test clomazone sorption affinity, capacity, desorption, interaction with soil organic matter and behavior with black carbon.
Adsorption-desorption behaviour of clomazone in Regosol and Chernozem agricultural soils
Journal of the Serbian Chemical Society
Studies of adsorption and desorption of pesticides by soils are important for understanding and predicting their fate and transport in the environment. Considering the agricultural and environmental relevance of clomazone, its sorption-desorption behaviour was studied in two widespread Serbian agricultural soil types named Regosol and Chernozem. Both phenomena are well-described by the Freundlich equation, which shows that clomazone is generally sorbed more to organic matter than to the mineral soil fractions. Chernozem, a soil containing more of both organic matter and clay, was found to bind more, and desorb less herbicide, than Regosol. Higher desorption hysteresis obtained for Chernozem could be attributed to its larger number of high-energy sorption sites, compared to Regosol. In both soils, the hysteresis effect increases with an increase in initial clomazone concentration in the soil-water system, while the percentage of desorbed amount during successive desorption cycles decreases. The presented adsorption-desorption study shows that soil composition plays an important role in clomazone behaviour and fate in the environment, and a significantly reduced probability of contamination of both the deeper soil layers and groundwater may be expected when this herbicide is found in humus-rich soils.
Clomazone sorption in soil: Incubation time, temperature, and soil moisture effects
Journal of Agricultural and Food Chemistry, 1995
Sorption-desorption of the herbicide clomazone in a silty clay loam soil was evaluated for time, temperature, and moisture dependence. In unsaturated soil, clomazone sorption peaked at different times depending on incubation temperature. Soil moisture had little effect on clomazone sorption.
Clomazone fate in soil as affected by microbial activity, temperature, and soil moisture
Journal of Agricultural and Food Chemistry, 1995
Laboratory studies were conducted to investigate the fate of the herbicide clomazone [2-[(2chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonel in soil. Effects of soil microbial activity, incubation temperature, and soil moisture on clomazone fate were determined up to 84 days following surface application of [W]clomazone uniformly labeled in aromatic rings ([AR-14C]clomazone) to a Flanagan silty clay loam soil. On the basis of a comparison of clomazone fate in sterilized soil and reinoculated soil, clomazone degradation was biologically dependent. The greatest clomazone mineralization rate occurred at a lower temperature than did the greatest microbial respiration rate; respiration and clomazone mineralization increased with increasing soil moisture content. Clomazone volatilization increased with increasing temperature but was not significantly affected by soil moisture treatment. In all studies, 59% or more of applied clomazone was extracted from soil as parent clomazone 84 days after application. Unextractable radioactivity accounted for 12% or less of that applied. A single detectable metabolite, persistent only under conditions of low temperature or low soil moisture content, accounted for less than 5% of applied radioactivity at any sampling time. The metabolite did not contain the carbonyl carbon of clomazone. These data suggest the carbonyl carbon is converted to COz during formation of the clomazone metabolite.
Pest Management Science, 2019
BACKGROUND: Irrigation and tillage systems alone or in combination with organic amendments can strongly influence soil properties, which in turn may also modify the environmental fate of any pesticides applied. The present study was aimed at determining how amendment with composted olive-mill waste (W) influenced the herbicide clomazone's leaching, sorption, and persistence in rice field soils under different tillage and irrigation management practices. The field trial conducted covered three years in succession, with six treatments: irrigation by sprinkler and conventional tillage without (ST) or with W application (80 Mg ha-1) (STW), irrigation by sprinkler but no tillage (SNT), irrigation by sprinkler but no tillage with W application (SNTW), and continuous flooding irrigation and tillage without (FT) and with W application (FTW). RESULTS: The application of W significantly increased the adsorption of clomazone to soil in the first and third year. In the first year the persistence of clomazone under aerobic (t1/2 = 33.1-36.3 d) and anaerobic incubation conditions (t1/2 = 3.43-10.8 d) decreased after W application to t1/2 values in the ranges 18.1-29.7 d and 3.06-5.44 d, respectively. However, in the third year while clomazone persistence increased significantly in SNT and ST when W was applied under both incubation conditions, it decreased significantly in FT management under anaerobic incubation conditions. The This article is protected by copyright. All rights reserved. addition of W led to less leaching of clomazone, particularly for the FT case where the herbicide's leaching losses were 2.8 and 2.6 times lower in the first and third years after W addition, respectively. CONCLUSIONS: Using W as an organic amendment could be regarded as an invaluable strategy to reduce water contamination by clomazone in rice-growing, especially under traditional tillage and flooding management.
Journal of The Brazilian Chemical Society, 2008
This study evaluated the degradation of the herbicide clomazone in distilled water and from irrigated rice fields, through UV irradiation and under natural conditions. After a solid phase extraction (SPE) as preconcentration step, the remained concentration of clomazone was determined by high performance liquid chromatography with diode array detection (HPLC-DAD) and the identification of the degradation products was achieved by gas chromatography-mass spectrometry (GC-MS). Under UV irradiation, the clomazone was degraded faster in distilled water than in surface water. In irrigated rice water, under sunlight irradiation, clomazone presented a half-life time average of 3.2 days in three consecutive harvests, and after application the concentration in water remained higher than 0.1 μg L-1 for 20 days. Several by-products, like 2-chlorobenzaldehyde and 2-chlorobenzene methanol, were identified by GC-MS, which evidenced that the concentration of intermediates at the begining increase and then they also undergo degradation.
Effects of Clay Content in Soil on Pesticides Sorption Process
Journal of the Chilean Chemical Society, 2021
Intensive application of pesticides in the agricultural sector and for domestic purposes has resulted in increased usage over the years. Pesticides are used to control pest, diseases and weeds in agricultural and urban areas, but their persistence in the environment has resulted in human poisoning, health risk problem and environmental pollution due to their ability to permeate the soil surface, groundwater systems and water surface bodies. Sorption of two organophosphorus pesticides: Diazinon and Clorpyriphos was studied in a soil (S) and in soil modified with clay addition. Soil Alhue, VI region, Chile, was spiked with 1% of either Montmorillonite (M) or Kaolinite (K) (S1). In addition, organic matter (OM), in the soil was eliminated and this soil (S2), was spiked again, with 1% of both clays. Batch sorption and kinetics experiments were conducted to obtain the retained amounts onto the soil samples. Pesticides were quantified by high performance liquid chromatography (HPLC). The results showed that for both pesticides the sorption order is: S1-M ˃ S1-K > S1. For soil without OM (S2) the order is the same, although the adsorption was lower. The adsorption isotherms were expressed by the Langmuir and Freundlich models. The negative Gibb's free energy change (ΔG°) values obtained suggest that the adsorption of both pesticides, is an exothermic process. Clay addition to the soil, increased the adsorption processes, generating an increase in the amount of pesticide retained in the soil and partially avoiding possible contamination of the aquifers. The difference found in relation to the behavior of both clays on the soil, can be explained considering its structure and its octanolwater partition coefficient (kow).
Journal of environmental management, 2014
Sulfonamides (SAs) are one of the most frequently used antibiotics in the veterinary industry, showing high mobility in soils. Objectives of this research were to determine the sorption, distribution coefficients and involvement of different ionic forms of sulfamethazine (SMZ), a representative SAs, and to evaluate the transport of SMZ in biochar treated soils. Biochars were produced from an invasive plant, burcucumber (Sicyos angulatus L.), under slow pyrolysis conditions at peak temperatures of 300 C (biochar-300) and 700 C (biochar-700), respectively. The abilities of the biochars to retain SMZ in loamy sand and sandy loam soils were examined under different pHs and SMZ loadings. Soil column experiments were performed with and without biochars addition. Results showed that biochar-700 had a high degree of SMZ retention, with resultant decreased pH in both soils. Modeled effective sorption coefficients (K D,eff ) values indicated that the observed high SMZ retention at pH 3 could be attributed to the p-p electron donoreacceptor interaction and electrostatic cation exchange, whereas at pH 5 and 7, cation exchange was the main mechanisms responsible. There was no temporal retardation of SMZ in biochar treated soil as compared to the untreated soil. However, biochar-700 treatment achieved up to 89% and 82% increase in the SMZ retention in sandy loam and loamy sand soils, respectively. The overall results demonstrated that burcucumber biochar produced at higher temperature was effective in reducing the mobility of SMZ in the studied soils.