Balinova Anna, Mladenova Rositsa, Shtereva Deyana
Department of Toxicology, Plant Protection Institute, 2230 Kostinbrod, Bulgaria.
J Chromatogr A. 2007 May 25;1150(1-2):136-44. doi: 10.1016/j.chroma.2007.02.002. Epub 2007 Feb 5.
Implementation of a mixed-mode solid-phase extraction is discussed as a promising approach for matrix clean-up in multiresidue/multimatrix methods. Sorbents characterized by different mechanisms of sorption such as reversed-phase (graphitized carbon), weak anion exchange (primary-secondary amine) and strong anion exchange (quaternary amine) were studied for their effectiveness in the removal of the matrix co-extractives in grains, fruits and vegetables for trace pesticide residues analysis. The pesticide residues were determined by gas chromatography with electron capture and mass spectrometric detection. Recoveries data of 25 pesticides from different groups at 0.01 mg/kg level ranged between 73 and 117% and with standard deviation below 15%. The limits of quantification were below or at 0.01 mg/kg.
混合模式固相萃取的实施作为多残留/多基质方法中基质净化的一种有前景的方法进行了讨论。研究了具有不同吸附机制的吸附剂，如反相（石墨化碳）、弱阴离子交换（伯仲胺）和强阴离子交换（季胺），以评估它们在去除谷物、水果和蔬菜中基质共萃取物用于痕量农药残留分析方面的有效性。农药残留通过气相色谱-电子捕获和质谱检测来测定。在0.01 mg/kg水平下，来自不同组的25种农药的回收率数据在73%至117%之间，标准偏差低于15%。定量限低于或为0.01 mg/kg。
