论文部分内容阅读
目的建立水果中五氯硝基苯(PCNB)的QuEChERS-毛细管气相色谱测定法。方法样品采用QuECHERS进行预处理,选用正己烷提取,乙二胺-N-丙基硅烷(PSA)净化,以RTX-5毛细管色谱柱分离,电子捕获检测器检测,外标法定量。结果本法在0.02-0.3 mg/kg范围内线性关系良好,相关系数为0.999 6,方法加标回收率为86.3%-105.4%,相对标准偏差小于4.15%,检出限为0.002mg/kg。结论本法样品前处理简单快速、检出限低、重现性好,可用于水果中五氯硝基苯的测定。
Objective To establish a QuEChERS-capillary gas chromatographic method for the determination of pentachloronitrobenzene (PCNB) in fruits. Methods The samples were pre-treated with QuECHERS. The samples were extracted with n-hexane, purified with ethylenediamine-N-propylsilane (PSA), separated by RTX-5 capillary column, detected by electron capture detector and quantified by external standard method. Results The method showed good linearity in the range of 0.02-0.3 mg / kg with a correlation coefficient of 0.999 6. The recoveries were 86.3% -105.4%. The relative standard deviations were less than 4.15% with a detection limit of 0.002 mg / kg. Conclusion The sample pretreatment is simple and fast, the detection limit is low, and the reproducibility is good. It can be used for the determination of pentachloronitrobenzene in fruits.