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目的建立用快速溶剂萃取仪萃取枸杞中对硫磷的方法。方法称取捣匀的样品5.0 g,加20.0 g硅藻土,研磨成沙状,放入事先在底部装有6.5 g铝粉的萃取池中,用快速溶剂萃取仪萃取枸杞中对硫磷残留量,用安捷伦GC-6890N气相色谱仪测定。结果浓度在0.010μg/ml~3.0μg/ml之间具有良好的线性关系,r值在0.9996~0.9998之间;RSD在0.56%~2.2%之间,回收率在98%~107%之间,最低检出限为0.18 ng/kg,定量下线为0.57 ng/kg。结论简化了萃取过程,防止了污染,降低了潜在的分析误差,该方法的精密度、回收率、检出线、定量下线等各项方法学指标均符合痕量分析的要求,适合枸杞中对硫磷残留量痕量的测定。
Objective To establish a method for extracting parathion from wolfberry by using a rapid solvent extraction system. Methods Weigh 5.0 g of tamped sample, add 20.0 g of diatomaceous earth, grind it into a sand and place it in an extraction cell containing 6.5 g of aluminum powder at the bottom in advance. The parathion residue in wolfberry is extracted by a fast solvent extractor Amount, measured with an Agilent GC-6890N gas chromatograph. The results showed good linearity between 0.010μg / ml and 3.0μg / ml with r values between 0.9996 and 0.9998. RSD between 0.56% and 2.2% and recovery between 98% and 107% The minimum detectable limit was 0.18 ng / kg and the limit of quantification was 0.57 ng / kg. Conclusion The extraction process is simplified, pollution is prevented and potential analysis errors are reduced. The methodological indexes such as precision, recovery, detection line and quantitative off-line meet the requirements of trace analysis and are suitable for the determination of Chinese wolfberry Determination of parathion traces.