Abstract
This paper investigates a strategy as a quality control parameter, using standard surrogate and determination of a relation factor for determination of parathion-methyl, chlorpyriphos and cypermethrin pesticides in environmental aqueous matrices with distinct characteristics (river water, estuarine, seawater and weir water), using the technique of solid phase microextraction gas chromatography with flame ionization detector (SPME-GC-FID). Pesticides were very susceptible to matrix effects promoted by environmental samples. The salinity and the organic matter seem to have been the main sources of interference in the method. For chlorpyriphos, in middle and high levels, the values of relation factor (Rf) for estuarines, seawater and weir matrices were statistically similar. For cypermethrin, the statistical equality occurred in estuarine matrices in medium and high levels of concentration. That indicates proportional behavior between the pesticide and the surrogate recovery, suggesting that a single value of Rf can be used as correction factor recovery for any of these matrices.
Highlights
The abusive use of pesticides in agricultural production may be responsible for the contamination of food, soil and water
A real estimate of analyte concentration levels in samples should be based on an appropriate quality control
Pesticides were very susceptible to matrix effects promoted by environmental samples
Summary
The abusive use of pesticides in agricultural production may be responsible for the contamination of food, soil and water. The occurrence of herbicide residues in natural waters may present a risk to water resources with a negative impact on aquatic life.[1,2,3] The pesticides may trigger ecotoxicological problems acting as endocrine disruptor.[4] the concern and monitoring of pesticide residues in aqueous environmental matrices is necessary. The technological advances of the analytical instrumentation have provided a great simplification to implementing of the methods of analysis. Eliminating laborious steps in the sample preparation prior to analysis.[5,6] the procedures of sample preparation still represent an obstacle to development of an efficient analytical method.[7] The constituents or coextractives which are present in the sample, be food or environmental,[8,9,10] may be responsible for promote
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