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Average recoveries of fenthion and its metabolites obtained by the different extraction methods (the non-buffered QuEChERS (quick, easy, cheap, effective, rugged, and safe) method vs. the citrate-buffered QuEChERS method) at 0.1 mg/kg spiking level (n = 3) in various matrices: (A) brown rice, (B) chili pepper, (C) orange, (D) potato, and (E) soybean.
