Reduction/elimination of sulfur interference in organochlorine residue determination by supercritical fluid extraction

Supercritical Fluid Chromatography and Extraction

“…Lopez-Avila et al also used ion pair formation and derivatization, using tetrabutylammonium hydroxide and methyl iodide during the SFE of chlorophenoxy acid herbicides from soils (497). Tilio et al used SFE to selectively remove interferences from elemental sulfur in the SFE of chlorinated pesticides from sediment (498). In a rather unique application of SFE, Paquet and Khan confirmed that organophosphates and their metabolites covalently bound to serine residues in protein chains could be released by SFE without altering the protein (499).…”

Multi-residue determination of 41 insecticides in garlic by gas chromatography and ion trap mass spectrometry using the selective ion storage technique

“…Allicin is not a stable compound and readily forms secondary products consisting of various sulfides, which contribute to the specific flavor and odor of garlic 1. Sulfur‐containing compounds possess high affinity for thermal electrons and give strong electron‐capture detection (ECD) response 2. Therefore, the interferences caused by sulfur compounds are a major problem in monitoring insecticide residues in garlic by GC/ECD.…”