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Effect of different materials for QuEChERS on the extraction recovery of COT and 3-HCOT (n = 3): material A (magnesium sulfate (800 mg), sodium acetate (200 mg) and primary secondary amine (PSA, 150 mg)); material B (magnesium sulfate (800 mg), sodium chloride (200 mg) and C18 powder (150 mg)); and material C (magnesium sulfate (800 mg), sodium chloride (200 mg) and PSA (150 mg)).
