QUANTIFICATION OF CHLORPYRIFOS IN AQUEOUS SAMPLES BY LIQUID-LIQUID MICROEXTRACTION AND GAS CHROMATOGRAPHY WITH µ-ECD DETECTORQUANTIFICATION OF CHLORPYRIFOS IN AQUEOUS SAMPLES BY LIQUID-LIQUID MICROEXTRACTION AND GAS CHROMATOGRAPHY WITH µ-ECD DETECTOR
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Abstract
The evaluation of pollutants present in the environment is a reiterative issue at the international level, for this reason the development of new methodologies for the extraction of analytes from matrices such as surface waters, with a low impact on the environment, is imperative. Chlorpyrifos (CP) is an organophosphate compound widely used for pest control, toxic to living beings, which can be mobilized from soils to different water sources. Dispersive liquid-liquid microextraction (DLLME) can be considered as a methodology with characteristics of green analytical chemistry, due to the low consumption of solvent and time. The objective of this work was to optimize the DLLME for the analysis of CP in water samples. For the extraction, methanol was used as a dispersing agent and CS2 as an extracting agent, evaluating five extraction times: 5, 10, 15, 20 and 25 minutes. The extracts were analyzed by gas chromatography with an electron microcapture detector (GC-μECD). The results of the evaluation of the stirring time showed that, for the stirring times of 10 and 15 minutes, a recovery percentage of CP of 108 and 88% was obtained, respectively, with a detection and quantification limit of 18, 3 and 22.4 μg / L, respectively, and a precision expressed as a relative standard deviation of less than 14.2%, acceptable for this type of extraction. It can be concluded that the DLLME methodology associated with GC-μECD is a suitable alternative for the quantification of CP in aqueous matrices with a low environmental impact.
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