PTFE membranes (10mof pore size, 100 m in thickness) were employed for the construction of the extraction unit. The 1mL empty SPE cartridges and PTFE top-caps, necessary to construct the extraction devices, were obtained from Supelco (Madrid, Spain).
PTFE membranes (10mof pore size, 100 m in thickness) wereemployed for the construction of the extraction unit. The 1mLempty SPE cartridges and PTFE top-caps, necessary to construct theextraction devices, were obtained from Supelco (Madrid, Spain).