title: Critical evaluation and comparison of enrichment efficiency of multi-walled carbon nanotubes, C18 silica and activated carbon towards some pesticides from environmental waters.
abstract: In this work, optimization of multi-residue solid phase extraction (SPE) procedures coupled with high-performance liquid chromatography for the determination of Propoxur, Atrazine and Methidathion from environmental waters is reported. Three different sorbents were used in this work: multi-walled carbon nanotubes (MWCNTs), C18 silica and activated carbon (AC). The three optimized SPE procedures were compared in terms of analytical performance, application to environmental waters, cartridge re-use, adsorption capacity and cost of adsorbent. Although the adsorption capacity of MWCNT was larger than AC and C18, however, the analytical performance of AC could be made close to the other sorbents by appropriate optimization of the SPE procedures. A sample of AC was then oxidized with various oxidizing agents to show that ACs of various surface properties has different enrichment efficiencies. Thus researchers are advised to try AC of various surface properties in SPE of pollutants prior to using expensive sorbents (such as MWCNT and C18 silica).
authors: Department of Chemistry, Faculty of Science, Hashemite University, P.O. Box 150459, Al-Zarqa 13115, Jordan.
authors: Amjad H
authors: AH
authors: El-Sheikh
authors: Jamal A
authors: JA
authors: Sweileh
authors: Yahya S
authors: YS
authors: Al-Degs
authors: Ahmad A
authors: AA
authors: Insisi
authors: Nancy
authors: N
authors: Al-Rabady
mesh_terms: D000327:Adsorption; D002606:Charcoal; D002851:Chromatography, High Pressure Liquid; D037742:Nanotubes, Carbon; D010575:Pesticides / Q000032:analysis*; D012822:Silicon Dioxide; D052616:Solid Phase Extraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D037742:Nanotubes, Carbon; D010575:Pesticides; D014874:Water Pollutants, Chemical; D002606:Charcoal; D012822:Silicon Dioxide