Abstract
An analytical method was developed and validated for simultaneous quantitation of 65 pesticides, including one single solid-phase extraction (SPE) procedure in surface water by liquid chromatography coupled to tandem mass spectroscopy. Different parameters that have an influence on extraction efficiency were evaluated in this research. Different types of cartridges, elution solvents, and sorbent drying time were investigated, and the most appropriate one was selected. Moreover, various pretreatment techniques were applied to remove sediments from water without the loss of pesticides. Centrifugation was introduced as the best option at the beginning of sample preparation to resolve the clogging of the sorbent cartridges. The recoveries of all pesticides ranged from 70% to 120%, with a relative standard deviation of less than 13.7%. The feasibility of the method was evaluated on 10 surface water samples with different concentrations of sand, sediment, and particles.
Highlights
Introduction in Surface Water Using SolidPhaseIn the past decades, concern regarding the ecological influence of organic contaminants in water matrices has been enhanced
The optimized analysis was performed in the multiple reaction monitoring (MRM)
Analysis of pesticides was performed in positive mode, except for fipronil and its metabolites, which were analyzed in negative mode
Summary
Concern regarding the ecological influence of organic contaminants in water matrices has been enhanced. The potential adverse effects of these pesticide residues on the water ecosystem have received significant attention. Different national governments have set guidelines and procedures for the regulation of these chemicals in waters. Controlling them through monitoring is important to improve, protect and prevent further deterioration of water quality [2,3]. An effective clean-up procedure is required prior to instrument analysis [4,5]. This eliminates interferences (sediments, particles, organic compounds, biomolecules, pigments, etc.) present in water with low concentrations of pesticides
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