Controlled release of phoxim from organobentonite based formulation

Huang, Aimin; Huang, Zilun; Dong, Yan; Chen, Libiao; Fu, Lihua; Li, Lishuo; Ma, Lin

doi:10.1016/j.clay.2013.06.010

Cited by 21 publications

(24 citation statements)

References 27 publications

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“…Because of recalcitrance and stability of DIC and CHL, their concentration in soil was nearly higher than that of OPPs, candidate of OCPs for pest control after 1980's in China . Though OPPs was easy to be biodegraded in soil environment, and half‐lives of some OPPs was no longer than 50 d in bamboo forest soil , residual concentration of OPPs in soil was also higher for bulk usage in recent years . The main OPPs residue was the methamidophos (MEA), belonging to high toxic organophosphorus pesticide.…”

Section: Discussionmentioning

confidence: 99%

Concentrations, sources and pollution characteristic of organic pesticide in soil from typical Chinese Bamboo forest

Guo

Yang

et al. 2016

Env Prog and Sustain Energy

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Concentrations, pollutant characteristics and sources apportionment of organic pesticides (OPs) of fifty one soils from bamboo forest in Zhejiang province, China were investigated. Ten organochlorine(OCPs), three organophosphorus(OPPs), and one pyrethroids (OPYs) were detected. The detection rate (DR %) ranged from 27.27% to 100%, and descended in the order: OCPs>OPPs>OPYs. Concentrations of all OCPs and OPPs were <150 μg.kg−1, while the concentrations of hexachlorocyclohexane (HCH) and 1,1,1‐trichloro‐2,2‐di(4‐chlorophenyl)ethane (DDT) were <50 μg.kg−1, and no recent usage. However, fenvalerate(FEN) had a concentration of 1227 μg.kg−1, the maximal value of all OPs. OPs residue in soil with pH 3.10 ‐ 4.50 was nearly higher than those of soil with pH 4.51 ‐ 5.90. OCPs residue was positive correlated with soil TOC, while OPPs and OPYs residue were influenced markedly by usage and management intensity. The DR %, peak value and ratio of excess standard for methamidophos (MEA) was 82.35%, 33.62 μg.kg−1 and 82.35%, respectively. The residue levels of MEA accounted for 70.87% of the σ‐OPPs and significantly positively correlated with σ‐OPPs. All results was summarized that OPPs, OPYs and partial of OCPs such as Chlorothalonil (CHL), Dicofol (DIC) was main pollutant and potential to jeopardize the human health, bamboo forest environment and shoot production. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 729–736, 2016

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Section: Discussionmentioning

confidence: 99%

Concentrations, sources and pollution characteristic of organic pesticide in soil from typical Chinese Bamboo forest

Guo

Yang

et al. 2016

Env Prog and Sustain Energy

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“…The formation of an emulsion was expected to accelerate the dissolution of pretilachlor into water due to the increase of interface between them, and turned out to be a convenient technique to prepare pretilachlor-loaded organobentonite efficiently. In previous work, phoxim-loaded organobentonites were prepared by a similar method (Huang et al, 2013). In this work, pretilachlor-loaded organobentonites were prepared at a weight ratio 0.2 of pretilachlor to organobentonite, as the organobentonites of higher pretilachlor loading became sticky and difficult to ground to fine particles.…”

Section: Pretilachlor-loaded Organobentonitesmentioning

confidence: 99%

“…Release of pretilachlor from organobentonite in water was evaluated by a method similar to previous work by Huang et al (2013). The investigation was carried out in a thermostatic bath with continuous water supply at a flow rate of 50 mL · min −1 (Fig.…”

Section: Pretilachlor Release In Watermentioning

confidence: 99%

“…Organobentonites were prepared following the process described by Huang et al (2013). Briefly, aqueous dispersions of bentonite were mixed with DTMA and HTMA of the amount equivalent to 0.6 to 1.2 times of the clay's CEC and kept at 30 ± 1°C in an overhead shaker for 24 h. The dispersions were then separated by vacuum filtration.…”

Section: Preparation Of Organobentonitementioning

confidence: 99%

“…In previous work, organobentonites prepared by modification with dodecyltrimethyl ammonium chloride (DTMA) and hexadecyltrimethyl ammonium chloride (HTMA) were used as carrier of phoxim to obtain controlled release granules (Huang et al, 2013). The results indicated the feasibility of regulating the release of pesticide via controlling the structure of organobentonites.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Structural effects of organobentonites on controlled release of pretilachlor

Dai

Chen

et al. 2015

Applied Clay Science

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Fabrication and characterization of β-cypermethrin-loaded PLA microcapsules prepared by emulsion-solvent evaporation: loading and release properties

Feng

Yang

Zhang

et al. 2018

Environ Sci Pollut Res

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Microcapsulses can be designed to effectively encapsulate, protect, and control the release of pesticides. In this study, emulsion-solvent evaporation method was used to fabricate microcapsules using dichloromethane as the solvent, polylactic acid (PLA) as the carrier materials, poly(vinyl alcohol) as the emulsifier, and β-cypermethrin as the entrapped pesticide. The effects of process parameters on the microcapsules characteristics (size, loading content, and encapsulation efficiency) were investigated. Also, the release behavior of the β-cypermethrin was measured experimentally and modeled mathematically. Kinetic analysis indicated that release mechanism of β-cypermethrin was compatible to Fickian diffusion. By optimizing the process parameters, β-cypermethrin-loaded microcapsules were successfully produced with spherical shape, smooth surface, high encapsulation efficiency (> 80%), and a range of pesticide contents. These parameters could be adjusted to achieve delivery systems with desirable release profiles. The results are beneficial to develop delivery systems for rational and effective usage of pesticides.

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Controlled release of phoxim from organobentonite based formulation

Cited by 21 publications

References 27 publications

Concentrations, sources and pollution characteristic of organic pesticide in soil from typical Chinese Bamboo forest

Concentrations, sources and pollution characteristic of organic pesticide in soil from typical Chinese Bamboo forest

Structural effects of organobentonites on controlled release of pretilachlor

Fabrication and characterization of β-cypermethrin-loaded PLA microcapsules prepared by emulsion-solvent evaporation: loading and release properties

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