TY - JOUR
T1 - Supercritical fluid extraction of organochlorine pesticides from an aqueous matrix
AU - Barnabas, Ian
AU - Dean, John
AU - Hitchen, Steven
AU - Owen, Susan
PY - 1994/4/15
Y1 - 1994/4/15
N2 - Supercritical fluid extraction (SFE) conditions were optimised for the removal of organochlorine pesticides (OCPs) from water. OCPs were collected and extracted from solid-phase extraction disks (Empore) and also directly from a water sample using a modified extraction cell. High recoveries (>90%) were obtained for two of the three OCPs with Empore disks. Despite the good solubility of OCPs in pure CO2, the analyte recoveries decreased when they were extracted directly from water. Three different flow-rates were used in the direct SFE with no apparent change in recovery, indicating that extraction was diffusion-controlled. The effect of increasing the ionic strength of the aqueous sample on analyte recovery was investigated.
AB - Supercritical fluid extraction (SFE) conditions were optimised for the removal of organochlorine pesticides (OCPs) from water. OCPs were collected and extracted from solid-phase extraction disks (Empore) and also directly from a water sample using a modified extraction cell. High recoveries (>90%) were obtained for two of the three OCPs with Empore disks. Despite the good solubility of OCPs in pure CO2, the analyte recoveries decreased when they were extracted directly from water. Three different flow-rates were used in the direct SFE with no apparent change in recovery, indicating that extraction was diffusion-controlled. The effect of increasing the ionic strength of the aqueous sample on analyte recovery was investigated.
U2 - 10.1016/0021-9673(94)85060-7
DO - 10.1016/0021-9673(94)85060-7
M3 - Article
VL - 665
SP - 307
EP - 315
JO - Journal of Chromatography A
JF - Journal of Chromatography A
SN - 0021-9673
IS - 2
ER -