Unified method for multiresidue pesticide analysis in corn and sediment
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Abstract
Due to Brazil’s significant role as a major global corn producer and the impact of pesticide accumulation in sediments on the health of aquatic ecosystems, this study addresses the need for a simplified method to assess pesticide residues in both matrices, corn and sediments. A modified QuEChERS method combined with gas chromatography-mass spectrometry, was validated for the analysis of seven common pesticides in Paraná State, Brazil: desisopropylatrazine (DIA), deethylatrazine (DEA), diazinon, methyl parathion, pirimiphos methyl, malathion, and pirimiphos ethyl. Following the guidelines of INMETRO and SANTE 12682/2019, the method achieved quantification limits (8.40 - 15.00 μg kg-1 for sediment and 8.80 - 13.00 μg kg-1 for corn) below the maximum residue limits (MRL) established by EC 396/2005 for corn. The procedure demonstrated excellent linearity (R2 > 0.99), recovery rates (70-120%), and precision (relative standard deviations ≤ 20%). This validated method provides a unified, reliable, and sensitive approach for the multiresidue analysis of pesticides in corn and sediment, which is beneficial for environmental monitoring and food safety, particularly in essential agricultural regions like Brazil.
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