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Chromatograms of pencycuron with different dSPE sorbent treatments: (a) blank sample using PSA sorbent, (b) matrix-matched standard at 0.005 mg/kg using PSA sorbent, (c) blank sample using PSA and GCB sorbents, (d) matrix-matched standard at 0.005 mg/kg using PSA and GCB sorbents. The red arrows indicate the retention time for pencycuron at 5.26 min.
