Solid-phase extraction (SPE) and matrix solid-phase dispersion
(MSPD) are modern sample preparation methods that
are being increasingly used before pesticide analysis by TLC.
SPE on Bond Elut C-18 cartridges, TLC with silica gel 60-F
layers and hexane–chloroform–acetone–methanol (9+9+1
+ 1) as the mobile phase, and detection by scintillation counting
of layer segments were used in the assessment of the potential
of subsurface material and groundwater samples to
mineralize 14C-labeled pesticides (6).