Abstract
A new multi-residue method based on solid-phase extraction (SPE) with centrifugation was developed for determination and quantitation of 67 pesticides in water samples. Two SPE cartridges were tested: Chromabond C18 and Oasis HLB. Parameters that influence the extraction efficiency such as the eluent volume, the sample loading volume, the addition of organic solvent to water sample, sorbent drying and elute concentration were optimized. The innovation of this work was the examination of the use of a centrifugation technique in both the drying and elution steps. When combined with centrifugation, the volume of the elution solvent was reduced to 2 mL and the time for sorbent drying decreased also to 10 min under vacuum. Under the optimized conditions, this method showed good recoveries higher than 65% - 68% for the 67 analyzed pesticides using the C18 and HLB cartridges with relative standard deviations lower than 9.7% - 12.3%. Limits of quantification were between 2 and 20 ng.L–1. The simplicity of the described method, use of less of organic solvent, short procedure time, and good recoveries demonstrate the advantages of this environmentally friendly approach for routine analysis of numerous samples.
Highlights
Organic contaminants present in the environment are a result of different sources of pollution from anthropogenic activities [1]
In our previous paper [10], we have reported a rapid and reliable method based on solid-phase extraction (SPE) with centrifugation for the extraction and followed by gas chromatography (GC)/mass spectrometry detection (MS) detection for the determination of the 16 PAH identified by the US environmental protection agency (US-EPA) as priority pollutants in water samples
Under the instrumental conditions given above, efforts were undertaken to optimize the tuning parameters of all the pesticides in the GC-MS in flow injection mode and their analytical performances were tested in different scan modes
Summary
Organic contaminants present in the environment are a result of different sources of pollution from anthropogenic activities [1]. The pesticides, generated by the intensification of agriculture, are regarded as some of the most dangerous contaminants of the environment, despite their numerous merits. They can take part in various physical, chemical and biological processes Many of these pesticides are characterized by a strong persistence which explains their wide presence in the different compartments of the environment [1,2]. Due to these physicochemical characteristics and their extensive use, many of these pesticides end-up in surface and ground water. Their presence in water is considered as a potential risk for drinking water quality and human health, and for ecosystems [3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
