[Multiresidue analysis of pesticides in tea by supercritical fluid extraction (SFE) and GC-MS].

A multiresidue analysis of pesticides in tea using supercritical fluid extraction (SFE) and GC-MS was developed. The preprocessing using SFE shortened the total analysis time. The SFE extract contained less matrices than the extract obtained with organic solvents. However, these matrices disturbed instrumental analysis. So, the extract was cleaned up with ENVI™-Carb/NH2 and InertSep™ SI cartridge. A recovery test was carried out for 245 pesticides spiked in samples at the level of 0.1 μg/g. Recovery rates of 178 pesticides ranged from 70 to 120%, the relative standard deviations (RSDs) were less than 15%, and quantitation limits were between 0.01 and 0.05 μg/g. Based on these results, this method is considered to be useful for multiresidue analysis of pesticides in tea samples.