建立了超高效液相色谱-串联质谱(UPLC/MS/MS)检测土壤中多种环境基质下呋喃唑酮和氟苯尼考的方法.提取液采用磷酸盐缓冲溶液(pH=3)-乙腈(3:7,V/V),经过SPE固相萃取小柱SAX-HLB串联富集,使用Waters BEH C18色谱柱(2.1×100 mm)进行分离,UPLC/MS/MS在多反应监测模式下进行定性与定量分析.以3倍信噪比确定方法检出限,以10倍信噪比确定方法定量限.结果表明,本方法在5 min内即可分离两种物质,呋喃唑酮和氟苯尼考的检出限分别为1.19和0.41μg/kg;定量限分别为3.40和1.37μg/kg.50μg/L加标水平的呋喃唑酮和氟苯尼考的回收率分别为92%和79%;200μg/L加标水平下呋喃唑酮与氟苯尼考的回收率分别为96%和86%.%A detection method for furazolidone and florfenicol in soil with various environmental matrices was established using ultra performance liquid chromatography-tandem spectrometry (UPLC / MS / MS) technique. Extracting solution of a mixture of phosphate buffer (pH = 3) and acetonitrile (3 : 7, V/ V) was used in this experiment. The extracted water samples were enriched by SAX-HLB solid phase extraction column before the process of nitrogen blowing ( high purity nitrogen). The enriched antibiotics were desalted with 8 mL of methanol. Waters BEH C18(2. 1 × 100 mm) column was used for the sample separation. UPLC / MS / MS was carried out for qualitative and quantitative analysis under multi-reaction monitoring mode. The detection limit of the method was determined by 3 times of signal-to-noise ratio, and the limit of determination of the method was determined by 10 times of signal-to-noise ratio. The results showed that the detection limits of furazolidone and florfenicol were 1. 19 and 0. 41 μg / kg, respectively, and the limits of quantitation of furazolidone and florfenicol were 3. 40 and 1. 37 μg / kg, respectively. Besides, recovery experiment showed that, for the soil samples spiked with 50 μg / L furazolidone and florfenicol, the recoveries were 79% for florfenicol and 92% for furazolidone. Similarly, for the soil samples spiked with 200 μg / L furazolidone and florfenicol, the recoveries were 96% for furazolidone and 86% for florfenicol.
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