A study towards release dynamics of thiram fungicide from starch–alginate beads to control environmental and health hazards

Singh, Baljit; Sharma, Devinder; Gupta, Atul

doi:10.1016/j.jhazmat.2008.03.074

Cited by 71 publications

(48 citation statements)

References 24 publications

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“…[2] Substrates such as starch, [10] chitosan, [11] lignin, [12] alginate [13] and synthetic polymers [2] have been examined for producing SRFs. Clays have also been investigated for SRFs synthesis due to their stability, adsorptive capacity and low cost.…”

Section: Introductionmentioning

confidence: 99%

Mobility and efficacy of 2,4-D herbicide from slow-release delivery systems based on organo-zeolite and organo-bentonite complexes

Shirvani

Farajollahi

Bakhtiari

et al. 2014

Journal of Environmental Science and Health, Part B

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This research aimed to develop slow-release formulations (SRFs) of 2,4-dichlorophenoxyacetic acid (2,4-D) using zeolite and bentonite minerals modified with cetyltrimethylammonium (CTMA) surfactant. Adsorption-desorption, greenhouse bioassay and column experiments were carried out to assess the potential of the SRFs to control weeds while reducing the herbicide leaching losses to deep layers of soil. The results showed that only 6.5 mmol 2,4-D kg −1 was retained by Na-bent, and the herbicide was not adsorbed by Na-zeol at all. The surface modification with CTMA surfactant, however, improved the 2,4-D adsorption capacity of the zeolite and bentonite up to 207.5 and 415.8 mmol kg , respectively. The synthesized organo-minerals slowly released the retained 2,4-D discharging 22 to 64% of the adsorbed 2,4-D to the solution phase within 7 days. The SRFs significantly (P = 0.05) reduced the herbicide mobility within the soil columns keeping a great portion of the herbicide active ingredient in the upper 5 cm soil layer. The SRFs were significantly (P = 0.05) as effective as the free technical herbicide in weed control without harming the ryegrass as the main plant. Therefore, the synthesized SRFs could be considered as useful tools for weed control in sustainable agriculture.

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Section: Introductionmentioning

confidence: 99%

Mobility and efficacy of 2,4-D herbicide from slow-release delivery systems based on organo-zeolite and organo-bentonite complexes

Shirvani

Farajollahi

Bakhtiari

et al. 2014

Journal of Environmental Science and Health, Part B

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show abstract

“…Physical barriers implemented by solvent encapsulation can also help microorganisms growing in the aqueous phase to avoid any toxicity due to the solvent or the pollutant. 16 Hydro-gel polymers of alginate and PVA have been applied for encapsulation or entrapment of industrial enzymes, cells, drugs and even agrochemicals for control release delivery; 17 and these are found more suitable for encapsulating hydrophobic compounds than hydrophilic compounds. 18,19 This method has, however, not been tested for biodegradation of highly hydrophobic pollutants, such as PAHs.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-coated alginate-polyvinyl alcohol beads for encapsulation of silicone oil containing pyrene: a novel method for biodegradation of polycyclic aromatic hydrocarbons

Sarma

Pakshirajan

Mahanty

2010

J. Chem. Technol. Biotechnol.

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BACKGROUND: Polycyclic aromatic hydrocarbons (PAHs) are potential hazards in the environment owing to their toxic, carcinogenic and recalcitrant nature. Biodegradation of these compounds, although effective compared with other treatment techniques, is problematic owing to its low aqueous solubility and negligible bioavailability. The present study reports a novel method for biodegradation of PAHs using an encapsulated form of the pollutant in chitosan-coated alginate-polyvinyl alcohol (PVA) beads.

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“…Addition of the starch into the alginate bead formulations has improved the size, shape, and swelling of the alginate beads (Kim et al 2005). Recently, Singh and coworkers (Singh et al 2008(Singh et al , 2009a(Singh et al , b, c, 2010a(Singh et al , b, 2013 have prepared the polysaccharide-based pesticide delivery formulations based on, alginate, agar, starch, and neem leaf powder. These beads were prepared with ionotropic gelation of these polysaccharides with metal ions (Ca +2 , Ba +2 and Al…”

Section: Fernándezmentioning

confidence: 99%

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

Self Cite

288

175

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Agrochemicals are used to improve the production of crops. Conventional formulations of agrochemicals can contaminate the environment, in particular in the case of intensive cropping. Hence, there is a need for controlledrelease formulations of agrochemicals such as polysaccharides to reduce pollution and health hazards. Natural polysaccharides are hydrophilic, biodegradable polymers. This article reviews the use of polysaccharides in the form of micro-and nanoparticles, beads and hydrogels. The main points are: (1) slow release formulations minimize environmental impact by reducing agrochemical leaching, volatilization and degradation. For example, 50 % of the encapsulated insecticide chlorpyrifos is released in 5 days, whereas free chlorpyrifos is released in 1 day. (2) Slow release formulations increase the water-holding capacity of soil. (3) Slow release formulations better control weeds in the long run. (4) Polymer-clay formulations store ionic plant nutrients. (5) Polymer hydrogel formulations reduce compaction, erosion, and water run-off. They increase soil permeability and aeration, infiltration rates, and microbial activity, and, in turn, plant performance. In conclusion, polysaccharide formulations can be used for safer use of agrochemicals.

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A study towards release dynamics of thiram fungicide from starch–alginate beads to control environmental and health hazards

Cited by 71 publications

References 24 publications

Mobility and efficacy of 2,4-D herbicide from slow-release delivery systems based on organo-zeolite and organo-bentonite complexes

Mobility and efficacy of 2,4-D herbicide from slow-release delivery systems based on organo-zeolite and organo-bentonite complexes

Chitosan-coated alginate-polyvinyl alcohol beads for encapsulation of silicone oil containing pyrene: a novel method for biodegradation of polycyclic aromatic hydrocarbons

Polysaccharides as safer release systems for agrochemicals

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