Abstract
The analysis of organochlorine pesticides (OCPs) residues has received an increasing attention in the last decades. Solid-phase microextration (SPME) is a convenient and fast analytical method, which has been widely used for the determination of volatile and semivolatile organic compounds in aqueous samples. The multiwalled carbon nanotubes/polypyrrole composite coating was used for the SPME of OCPs in water samples. The effects of various parameters on the efficiency of SPME process such as extraction time, extraction temperature, ionic strength, desorption time, and desorption temperature were studied. Under optimized conditions, the detection limits for the OCPs varied between 0.051 and 0.39 pg mL-1, the inter-day and intra-day relative standard deviations for various OCPs using a single fiber were 6.5-11.5% and 3.6-11.5, respectively. The linear ranges varied between 0.001 and 1 ng mL-1. The method was successfully applied to the analysis of ground water samples with the recoveries from 86 to 110%.
Highlights
Determination of organochlorine pesticides (OCPs) has received great attention in recent decades
A multiwalled carbon nanotube-polypyrrole (MWCNTs/PPy) composite coated solid-phase microextration (SPME) fiber was first introduced in our laboratories for the extraction of phthalate esters from water [24]
We present an application of Multiwalled carbon nanotubes (MWCNTs)/PPy composite polymer in direct immersion SPME/GCECD for the analysis of twelve OCPs residues in water
Summary
Determination of OCPs has received great attention in recent decades These compounds have been widely used worldwide in order to increase crops output and enhance quality of products. Solid-phase microextration (SPME) developed by Pawliszyn and coworkers [12] is a practical solvent-free alternative for the extraction of organic compounds. This method is automated, it simplifies the extraction process and meaningfully decreases the analysis time. A multiwalled carbon nanotube-polypyrrole (MWCNTs/PPy) composite coated SPME fiber was first introduced in our laboratories for the extraction of phthalate esters from water [24]. We present an application of MWCNTs/PPy composite polymer in direct immersion SPME/GCECD for the analysis of twelve OCPs residues in water
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