茶叶农药残留色谱质谱法分析中常规前处理方法对检测结果的影响

Influence of Detection Result on Conventional Pretreatment Method During GC or GC-MS Analysis of Pesticide Resdues in Tea

为了解茶叶中色谱质谱分析前处理方法的检测效果、扩充检测参数,将相关文献进行梳理和归纳,重点总结了常规分析方法的提取和净化两个步骤的效果,对茶叶样品提取步骤所使用的提取溶剂、提取方式,净化步骤所使用的净化材料、SPE小柱、洗脱溶剂等同所分析的农药相结合,给出了分析的效果。认为在茶叶中农药多残留的色谱、质谱法分析中,根据目标分析物的结构特征、性质特征,选择复合溶剂和复合净化材料进行处理,将获得较好的效果。

Effect of sample pretreatment for gas chromatography-mass spectrometric(GC-MS) determination of pesticide residues in tea was analyzed. This article summarizes a literature review regarding the substrate extraction and purification on tea samples prior to GC-MS analysis. Generally, a specimen is firstly extracted using specific solvent(s) under defined conditions and procedures, and the extract purified using an eluent on a SPE column to collect eluate to be injected into a GC-MS device for an automated determination of the chemical components. Thus, pretreatment is critical for an accurate and reliable analysis and better obtained by employing composite solvents that have been selected according to the structure and characteristics of the target pesticide for the extraction and purification.