Determination of trace organophosphorus pesticides in water samples with TiO₂ nanotubes cartridge prior to GC‐flame photometric detection

Abstract

This article described a new method for the sensitive determination of organophosphorus pesticides in water samples using SPE in combination with GC-flame photometric detection. In the procedure of method development, TiO(2) nanotubes were used as SPE adsorbents for the enrichment of organophosphorus pesticides from water samples. Several factors, such as eluent and its volume, sample pH, sample volume, sample flow rate, and concentration of humic acid, were optimized. Under the optimal conditions, the proposed method had good linear ranges as 0.1-40 microg/L for each of them, LOD of 0.11, 0.014, and 0.0025 microg/L, and LOQs of 0.37, 0.047, and 0.0083 microg/L for chlorpyrifos, phorate, and methyl parathion, respectively. The proposed method was validated with real environmental water samples and the spiked recoveries were over the range of 86.5-115.1%. All these results indicated that TiO(2) nanotubes, as a new SPE adsorbent, would be used widespread for the preconcentration and determination of environmental pollutants in the future.

Recent advances in solid-phase sorbents for sample preparation prior to chromatographic analysis

“…As a new TiO2 nanomaterial, TiO2 nanotubes (NTs) have often been used as the photo catalyst for photo degradation. However, it should have much higher adsorption capacity and much greater potential for the trapping of compounds because it has a larger surface area [194]. For example, organophosphorus pesticides in water samples [194], benzoyl-urea insecticides [195] and polychlorinated biphenyls [196] in environmental water samples were extracted by SPE using TiO2-NTs as SPSs.…”

“…However, it should have much higher adsorption capacity and much greater potential for the trapping of compounds because it has a larger surface area [194]. For example, organophosphorus pesticides in water samples [194], benzoyl-urea insecticides [195] and polychlorinated biphenyls [196] in environmental water samples were extracted by SPE using TiO2-NTs as SPSs. In µSPE, TiO2-NTs were used to extract pyrethroid pesticides [46] and organochlorine pesticides [47] in water samples.…”

Monitoring of Organophosphorus and Organochlorine Pesticides Residues in Freshwater of Suez Canal Region, Egypt by Gas Chromatography

“…Today, gas chromatography (GC) still remains the most popular technique for accomplishing multicomponent methods, as demonstrated by an effective identification /confirmation tool. The literature survey revealed that Gas chromatography (GC) and GC-MS has traditionally been the methods of choice for the analysis of organophosphorus pesticides (OPPs) in water samples (Serrano et al, 2012;Akdoğan et al, 2011;Fang et al, 2012;Samadi et al, 2012;Yang et al, 2011;Camino-Sánchez et al,2011;Alves et al, 2011;Portolés et al,2011;Toledano et al,2010;Jurzik et al, 2010;Huang et al, 2010;López-Blanco et al,2005)and for analysis of organochlorine pesticides (OCPs) (Beamer et al, 2012;Dasgupta et al,2011;He et al, 2011;Mawussi et al, 2009;Kumari et al, 2008;Brondi et al, 2005;Wasswa et al, 2011;Chen et al, 2011;Jan et al, 2009;Portolés et al, 2010;Tahboub et al, 2005). The objective of this research was to monitor some OPPs and OCPs pesticides residues in Ismailia freshwater canal samples by GC using flame photometric detector (FPD) for OPPs and electron capture detector for OCPs pesticides.…”

TiO2 nanotube arrays prepared by anodization as an adsorbent in micro‐solid‐phase extraction to preconcentrate and determine nitrogen‐containing polycyclic aromatic hydrocarbons in water samples

“…Much attention has been paid to the applications of nanosized SPE sorbents because they can offer several advantages over traditional SPE sorbent such as more adsorption sites, high extraction capacity, and wide scope for pollutants . However, the flow rate of the sample may decrease and result in long analysis time when nanomaterials are used as sorbents in packed SPE columns and it is also difficult to be separated and reused if they are applied in dispersive SPE.…”