枸杞中对硫磷残留量痕量测定的溶剂微萃取方法的研究  

Study on solvent micro-extraction method for determination of trace parathion in barbary wolfberry fruit

作　　者：陈京闽[1] 索芳[1] 王生英[1] 

机构地区：[1]宁夏疾病预防控制中心理化科,宁夏银川750004

出　　处：《中国卫生检验杂志》2014年第13期1874-1875,1878,共3页Chinese Journal of Health Laboratory Technology

摘　　要：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 determination of parathion in barbary wolfberry fruit by rapid solvent extraction apparatus.Methods The 5 g pounded uniform samples and 20 g diatomite were grinded into sand-size particles and put into the extraction pool with 6.5 g aluminum powder at the bottom.Then parathion residues in barbary wolfberry fruit were extracted with rapid extraction solvent and analyzed by agilent GC-6890N gas chromatograph.Results The parathion concentration between 0.010 μg/ml ~ 3.0 μg/ml showed good linear relationship and r value was between 0.9996 and 0.9998.The RSD value was 0.56% ~ 2.2%,the recoveries ranged from 98% to 107%,the lowest detection limit was 0.18 ng/kg,and the quantitative lower limit was 0.57 ng/kg.Conclusion The established method has simplified the trace extraction process,avoided pollution and reduced the potential analysis error.The precision,recovery,detection limit and qualification limit of the method were in line with the requirements of trace analysis,so it is suitable for trace determination of parathion in barbary wolfberry fruit.

关 键 词：快速溶剂萃取仪 气相色谱仪 对硫磷 枸杞 

分 类 号：O658.2[理学—分析化学]