Organophosphorus insecticide residues in olives and olive oil

Abstract

In order to check the pre‐harvest intervals established in Portugal for olive trees, residue dissipation studies have been carried out for the organophosphorus insecticides diazinon, dimethoate, methidathion, parathion and phosphamidon. Simul‐taneously with the analyses of the olives, olive oil produced in the laboratory by a mechanical procedure of pressing the olives was also analysed. The analyses were car‐ ried out by gas‐liquid chromatography. Residues found in the fresh olives, sampled at the end of pre‐harvest intervals in force for each of the insecticides, were accept able. However, for diazinon and parathion, unacceptable high residue levels were found in the olive oil. The concentration of methidathion residues in the olive oil was also observed. For dimethoate and phosphamidon, no detectable residues were found in the olive oil, even when the olives were sampled one day after spraying.

Extraction techniques for pesticide residues analysis in edible oils and role of sorbents in cleanup

“…For example, cleanup of pesticide residues of olives and olive oil sample were performed by Ferreira et al. (1983) using florisil as a cleanup sorbent . Florisil being polar sorbent, was less effective in removal of non‐polar impurities hence was replaced by C18 and PSA.…”

“…Among these sorbents, florisil has been found to be ideal for the extraction of organochlorine pesticides from fatty matrix because it retained some fatty acids [29]. For example, cleanup of pesticide residues of olives and olive oil sample were performed by Ferreira et al (1983) using florisil as a cleanup sorbent [30]. Florisil being polar sorbent, was less effective in removal of non-polar impurities hence was replaced by C18 and PSA.…”

Acephate and Buprofezin Residues in Olives and Olive Oil

“…In Table 48.1, residue levels of acephate and buprofezin were compared with those of the most important insecticides used in olive production to control fruit fly (Ferreira, 1983;Cabras, 1997Cabras, , 2000Cabras, , 2002. Table 48.1 reports for each insecticide: the maximum residue level (MRL) (Table 48.2) together with the pre-harvest intervals (PHIs); residues on olives at different days after the treatment (DAT), residues in the processed olive oils, residue concentration factors during olive oil production (CF), the acceptable daily intake (ADI) (Table 48.3), and the partition coefficient octanol/water (log P).…”

Dispersal ability of marked, irradiated olive fruit flies [Bactrocera oleae (Rossi) (Diptera: Tephritidae)] in arid regions

“…The olive fruit fly Bactrocera oleae (Rossi) is the key insect pest of olive cultivation around the Mediterranean basin, and more recently in America (Rice 2000). The main control method applied against the fly is bait spray with toxic chemical compounds, resulting in adverse effects on the environment and quality of the produced olive oil (Ferreira and Tainha 1983). To reduce pesticide utilization to control the olive fly, extensive research has been undertaken on the application of alternative control methods such as mass trapping, biological control, and the use of the Sterile Insect Technique (SIT).…”