1.日照海关,山东 日照 276826
2.青岛海关技术中心,山东 青岛 266114
张鸿伟,博士,正高级工程师,研究方向:食品质量安全检测,E-mail:light04@126.com
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高尧华,刘梦琳,李林杰等.气相色谱-三重四极杆质谱法测定绿茶中35种农药残留[J].分析测试学报,2023,42(10):1327-1334.
GAO Yao-hua,LIU Meng-lin,LI Lin-jie,et al.Determination of 35 Pesticide Residues in Green Tea by Gas Chromatography-Triple Quadrupole Mass Spectrometry[J].Journal of Instrumental Analysis,2023,42(10):1327-1334.
高尧华,刘梦琳,李林杰等.气相色谱-三重四极杆质谱法测定绿茶中35种农药残留[J].分析测试学报,2023,42(10):1327-1334. DOI: 10.19969/j.fxcsxb.23052903.
GAO Yao-hua,LIU Meng-lin,LI Lin-jie,et al.Determination of 35 Pesticide Residues in Green Tea by Gas Chromatography-Triple Quadrupole Mass Spectrometry[J].Journal of Instrumental Analysis,2023,42(10):1327-1334. DOI: 10.19969/j.fxcsxb.23052903.
建立了QuEChERS/气相色谱-三重四极杆质谱同时测定绿茶中35种农药残留的分析方法。样品经85 ℃热水冲泡,放凉后加入乙腈提取,采用200 mg N-丙基乙二胺(PSA)、200 mg 十八烷基硅烷(C,18,)、50 mg石墨化炭黑(GCB)为分散固相萃取剂净化后,以Agilent HP-5MS毛细管柱(30 m × 0.25 mm × 0.25 μm)分离,采用电子轰击离子源,以多反应监测模式测定,基质匹配标准曲线外标法定量。35种农药在10~1 000 µg/L质量浓度范围内线性关系良好,相关系数(,r,2,)大于0.99,方法检出限和定量下限分别为1~5 µg/kg和5~15 µg/kg。在20、40、200 µg/kg 3个加标水平下,绿茶基质中35种农药的平均回收率为70.3%~112%,相对标准偏差为1.6%~12%。应用该方法对30份市售绿茶样品进行检测,在4份样品中检出6种农药。该方法简单快速,灵敏度和准确度高,适用于绿茶样品中35种农药残留的日常检测。
A method of QuEChERS/gas chromatography-triple quadrupole mass spectrometry was established for the simultaneous determination of 35 pesticide residues in green tea. The samples were brewed with water at 85 ℃,then extracted with acetonitrile after cooling down. After purified with 200 mg PSA,200 mg C,18, and 50 mg GCB,the analytes were separated on an Agilent HP-5MS capillary column(30 m×0.25 mm×0.25 μm). The analysis was performed in electron impaction source under multi-reaction monitoring mode,and quantified by matrix-matched standard curve and external standard method. There were good linear relationships for 35 pesticides in concentration range of 10-1 000 µg/L,with their correlation coefficients(,r,2,) larger than 0.99. The limits of detection and limits of quantitation were 1-5 µg/kg and 5-15 µg/kg,respectively. The average recoveries for 35 pesticides in green tea at the spiked levels of 20,40 and 200 µg/kg ranged from 70.3% to 112%,with relative standard deviations of 1.6% -12%. 30 commercially available green tea were detected by the proposed method,and 6 pesticides were found in 4 samples. The method is simple,rapid,sensitive,and accurate,and could be adapted for daily analysis and planed monitoring of 35 pesticide residues in green tea samples.
气相色谱-三重四极杆质谱法绿茶农药残留QuEChERS
gas chromatography-triple quadrupole mass spectrometrygreen teapesticide residueQuEChERS
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