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

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.