Determination of pesticides in water samples by solid phase extraction and gas chromatography tandem mass spectrometry

Abstract

A multiresidue method for the determination of more than 80 pesticides in water has been developed and validated. The proposed method is based on SPE followed by GC coupled to MS/MS. Different variables affecting SPE procedure, such as cartridges, sample volume and solvents were studied, and mass spectrometric conditions were optimised in order to increase selectivity and sensitivity. Calibration curves were linear over the range of 0.03-0.5 microg/L. Recoveries were in the range of 70-110% and repeatability was below 20% for the lowest calibration point. LODs ranged from 0.001 to 0.025 microg/L and LOQs from 0.003 to 0.076 microg/L. Finally, the method was successfully applied to the analysis of water samples from southeast of Spain.

Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis

“…Therefore, contamination of matrices such as soil, water and even the agricultural products with various agrochemicals is a serious threat to human health [1,2]. Owing to properties like high stability and resistant to a wide range of pH, temperature and light, fungicides, one type of pesticides, are widely used for the protection and preservation of a variety of crops, fruits, and vegetables [3].…”

Exploring rearrangements along the fragmentation pathways of diuron anion: A combined experimental and computational investigation

“…DCMU as well as other herbicides were previously investigated in the positive electrospray ionization mode coupled to HPLC and different mass spectrometric analyzers [22,23]. Unlike the gas phase chemistry of positive ions, very little is known in regard to negative ionic species, especially in concern to their reactivity and fragmentation behaviour.…”

Application of SPE‐HPLC‐DAD and SPE‐TLC‐DAD to the determination of pesticides in real water samples

“…The concentration of the pesticides in original samples is very low and a preconcentration method should be applied. Current methods to screen pesticides from environmental water matrices, require an enrichment step, usually SPE, prior to analysis by HPLC [1] or GC methods [2]. TLC is the analytical method of choice for nonvolatile and thermally labile pesticides.…”