关键词: 固相萃取, 气相色谱-质谱法, 水产品, 残留量

Abstract:

This study aimed to establish an analytical method for the determination of thiobencarb and furathiocarb pesticide residues in aquatic products using solid-phase extraction (SPE) and gas chromatograph-mass spectrometry. Extraction with acetonitrile was used for sample preparation. The prepared sample was cleaned-up using SPE column (filled with 0.5 of C18 and 5 g of Na2SO4, and then eluted with 10 ml of acetonitrile). The total ion current (TIC) was identified by a spectrum library search. Selected ion monitoring (SIM) was used as a quantitative method. The two pesticides show good linearity in a detected concentration range with good correlation coefficient (r=0.997 to 1.000). The method recoveries are generally from 82% to 110% with relative standard deviation (RSD) of 3.74% to 8.18% and the limit of detection is 0.01 mg/kg (S/N >10). The method is effective, fast, accurate and economical, and it can meet the detection demand for import and export.

Key words: SPE, GC-MS, aquatic products, residue