Determination of malachite green and crystal violet residues in aquatic products by high performance liquid chromatography-tandem mass spectrometry

1. SPE column: Neutral alumina column: Cleanert Alumina-N, 1 g/6 mL, activated cation exchange column with 5 mL acetonitrile before use: Cleanert PCX, 60 mg/3 mL, activated with 3 mL acetonitrile and 3 mL formic acid solution before use.

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