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Application of Silica Nanoparticles in the Determination of Herbicides in Environmental Water Samples Using Liquid Chromatography-Mass Spectroscopy

[ Vol. 16 , Issue. 5 ]

Author(s):

Mir Waqas Alam*, Tentu Nageswara Rao, Yarasani Prashanthi, Vourse Sridhar, Adil Alshoaibi, Basma Souayeh, Hatem Abuhimd and Faheem Ahmed*   Pages 748 - 756 ( 9 )

Abstract:


Background: Herbicides are very beneficial in the crop yield with the aid of controlling weeds within the agriculture, but several herbicides are chronic in soil.

Objective: In this study, nanoparticles and the packages of synthesized novel silica nanoparticles were studied for the preconcentration of herbicides.

Methods: These nanoparticles prepared by the Stöber mechanism were purified and functionalized. Nanoparticles thus prepared successfully were used as supporting material for the preconcentration of residues of herbicides in the water.

Results: Preconcentration was achieved by preparing the silica-based solid-phase-extraction cartridges. Nanoparticles used for this purpose were within the range of 50-250 nm. An SPE cartridge was prepared by packing 200 mg of silica nanoparticle in the empty cartridge of diameter 5.5 cm and length 0.6 cm in between PTFE frits. Aqueous solutions of 0.1 μg/ml of herbicides were prepared separately, and 10 ml of the solution was passed through the cartridge at the rate of 0.2 ml/min. After passing 10 ml volume of the aqueous solution, residues adsorbed on the cartridge were eluted using 2 ml of acetonitrile. The eluate was injected to determine the herbicide residue adsorbed on the SPE cartridge.

Conclusion: In the study, it was found that greater than 90% of the herbicide residues were trapped on silica nanoparticle-based SPE cartridge. An analytical method was developed for the simultaneous determination of these herbicides. The residues were quantified by LC-MS/MS with ESI mode.

Keywords:

Silica nanoparticles, herbicides, LC-MS/MS, solid-phase extraction, liquid chromatography, nanomaterials.

Affiliation:

Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Hassa 31982, School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam, 51140, Department of Chemistry, Mahatma Gandhi University, Nalgonda, Telangana State, Department of Chemistry, Mahatma Gandhi University, Nalgonda, Telangana State, Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Hassa 31982, Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Hassa 31982, National Center for Nanotechnology and Semiconductor, King Abdulaziz City for Science and Technology P.O. Box 6086 Riyadh 11442, Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Hassa 31982



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