排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
A modified QuEChERS-gas chromatography-mass spectrometry method using multi-walled carbon nanotubes (MWCNTs)as adsorbent was established for the determination of 72 pesticide residues in Lonicera japonicae Flos. The sample was extracted with Association of Official Agricultural Chemists (AOAC)extracting package,purified with MWCNTs-modified purification tube,analyzed with dynamic multiple reaction monitoring mode,and quantified with external standard method of matrix-matched standard curve. The 72 pesticides showed good linearities in the corresponding concentration ranges with correlation coefficients greater than 0.9936. The limits of detection were 0.001-0.178 μµg/kg,and the limits of quantitation were 0.002-0.593 μµg/kg. The average recoveries for four spiked levels ranged from 60.1% to 118.0%,with the relative standard deviations of 2.2%-17%. © 2023, Youke Publishing Co.,Ltd. All rights reserved. 相似文献
2.
3.
基于羟基多壁碳纳米管(MWCNTs - OH)净化剂改进的分散固相萃取技术,建立了党参中75种农药残留的气相色谱-串联质谱(GC - MS/MS)检测方法。样品经乙酸乙酯提取,无水硫酸镁、乙酸钠、N-丙基乙二胺和羟基碳纳米管盐析、萃取净化后,采用气相色谱-串联质谱仪测定,动态多反应监测(dMRM)模式扫描,基质标准曲线外标法定量。75种农药在5~300 μg/L范围内线性关系良好,相关系数(r2)均不低于0.996 1。方法检出限(LOD)和定量下限(LOQ)分别为0.001~0.054 mg/kg和0.002~0.178 mg/kg,在0.025、0.05、0.20、0.50 mg/kg 4个加标水平的平均回收率为69.7%~113%,相对标准偏差(RSD,n = 4)为0.64%~6.7%。该方法操作简单、快速、准确,适用于党参中农药多残留的高通量检测。 相似文献
1