SFE and MAE were suitable
extraction means for carbamates in sediment samples. However, a
sample cleanup using SPE cartridges is required after SFE and
MAE. The cleanup steps are extensive and laborious. SPME give
satisfactory results, but the fibers used in SPME are expensive and
fragile. Furthermore, heating is required to facilitate the extraction,
and, thus, this technique is not suitable for carbamate extraction
for its thermal instability.