“…In this case, the preferred strategy is based on the retention of waxes in the sorbent whereas pesticides are eluted. Methodologies using Florisil (Adamczyk et al, 2007, Frison et al, 1999, Tsigouri et al, 2000, Tsigouri et al, 2004, C 18 (Chauzat & Faucon, 2007, Jiménez et al, 2004a, Kamel & Al-Ghamdi, 2006) also combined with HLB (Jiménez et al 2004b) were reported. Selective eluting step is carried out using non-polar mixtures (nhexane:diethylether mixtures) to polar ones (based on MeOH and MeCN), respectively.…”