Under the
optimal conditions,the method provided high enrichment factors ranging from 364 to 434, good line-
arities ranging from 5 to 200 ng g?1 for metolcarb,baygon and methiocarb and 10 to 200 ngg?1 for
carbofuran and isoprocarb,low limits of detection ranging from 0.58 to 2.06ng g?1, and satisfactory
spike recoveries (between 90.34%and101.98%withtherelativ standard deviation values from 1.21%to
5.93%).