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Alam S.,Institute of Pesticide Formulation Technology IPFT
Bulletin of Environmental Contamination and Toxicology | Year: 2011

A field trial was carried out to understand the persistence behaviour of tetraconazole in mango and also in the soil of mango orchard following five applications @ 50 g a.i./ha (T 1) and 100 g a.i./ha (T 2). The initial deposits were found to be 0.23 and 0.38 μg/g for T 1 and T 2 doses. The theoretical maximum residue contribution (TMRC) of tetraconazole in dietary exposure appeared to be toxicologically safe for consumption as compared with maximum permissible intake (MPI). The half-life values of tetraconazole in mango were in the range of 4-5 days. The harvest samples of mango and soil were free from tetraconazole residues. © 2011 Springer Science+Business Media, LLC. Source


Nair K.K.,Institute of Pesticide Formulation Technology IPFT | Kaur R.,Institute of Pesticide Formulation Technology IPFT | Iqbal N.,Institute of Pesticide Formulation Technology IPFT | Hasan A.,Institute of Pesticide Formulation Technology IPFT | And 2 more authors.
Materials Research Express | Year: 2015

The present study shows the synthesis of magnetite nanoparticles by co-precipitation method in three steps. The steps involve the precipitation of Fe3O4 nanoparticles followed by layer by layer functionalization with silica and tetraethoxy(octadyl)silane (C18). The prepared magnetite nanoparticles were investigated by SEM, TEM, XRD, FTIR and VSM. It was suggested that the intermediate iron oxide nanoparticles were formed by the competing processes of oxidation and crystal growth after decomposition of ferrous and ferric salts. The first step synthesized nanoparticles were of around 16 ± 4 nm, second step silica coating of 18 ± 3 nmand the final step C18 were of 56 ± 6 nm. The tetraethylorthosilicate hydrolyzed to form silicic acid which further polymerizes and thereby forms a layer of silica over magnetite nanoparticles. FTIR peaks at 2854 and 2921 cm-1 confirm the layering of C18 on silica encapsulated nanoparticles which corresponds to ∼CH2 and ∼(CH2)17CH3 carbon chain symmetric extension. The thickness of silica coating and C18 are 1.9 ± 0.3 nmand 38.6 ± 2.5 nm as confirmed fromTEMsize distribution curve. The saturation magnetism of magnetite, silica coated and C18 nanoparticles are 77.46, 74.53 and 68.76 emu g-1 respectively. Thus, Fe3O4, silica and C18 encapsulated magnetite nanoparticles were superparamagnetic. © 2015 IOP Publishing Ltd. Source


Kaur R.,Institute of Pesticide Formulation Technology IPFT | Hasan A.,Institute of Pesticide Formulation Technology IPFT | Iqbal N.,Institute of Pesticide Formulation Technology IPFT | Alam S.,Institute of Pesticide Formulation Technology IPFT | And 2 more authors.
Journal of Separation Science | Year: 2014

In recent years, water pollution and pesticide accumulation in the food chain have become a serious environmental and health hazard problem. Direct determination of these contaminants is a difficult task due to their low concentration level and the matrix interferences. Therefore, an efficient separation and preconcentration procedure is often required prior to the analysis. With the advancement in nanotechnology, various types of magnetic core-shell nanoparticles have successfully been synthesized and received considerable attention as sorbents for decontamination of diverse matrices. Magnetic core-shell nanoparticles with surface modifications have the advantages of large surface-area-to-volume ratio, high number of surface active sites, no secondary pollutant, and high magnetic properties. Due to their physicochemical properties, surface-modified magnetic core-shell nanoparticles exhibit high adsorption efficiency, high rate of removal of contaminants, and easy as well as rapid separation of adsorbent from solution via external magnetic field. Such facile separation is essential to improve the operation efficiency. In addition, reuse of nanoparticles would substantially reduce the treatment cost. In this review article, we have attempted to summarize recent studies that address the preconcentration methods of pesticide residue analysis and removal of toxic contaminants from aquatic systems using magnetic core-shell nanoparticles as adsorbents. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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