The method for the determination of 12 kinds of C9 aromatics in aquatic products by gas chromatography-triple quadrupole mass spectrometry (GC-MS/MS) was established. The multiple reaction monitoring (MRM) method of 12 kinds of C9 aromatics was established, and the retention time and MRM mass spectrometric parameters of 12 kinds of C9 aromatics were obtained. The total ion chromatography (TIC) of 12 kinds of C9 aromatics was also plotted. The four organic solvents, ethyl acetate, n-hexane, acetone and n-hexane:acetone (7:3) mixed solution, were tested for their ability to extract the targets in aquatic products. Ethyl acetate was used as the final extraction solvent. Two extraction methods of ultrasonic and homogenization were compared, and the homogenization-based extraction method was determined. The extraction time was 2 min. The dosage of purification adsorbent was 0.1 g primary secondary amine (PSA), 1 g anhydrous magnesium sulfate, 1 g neutral alumina. The results showed that 12 kinds of C9 aromatics were detected in a linear dynamic range of 0.01-1.0 μg/mL. The limits of instrument detection (LOID), limits of quantitation (LOQ) and limits of method detection (LOMD) were 0.124-2.502 μg/L, 0.413-8.340 μg/L and 0.248-5.004 μg/kg respectively. The average recoveries were in the range of 75%-112% and the relative standard deviations(RSD) were below 6.7%. The method was used to determine the content of 12 kinds of C9 aromatics in different aquatic products. It provided reference for the establishment of landmarks and even national standards.
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