Determination of organochlorine pesticide residues in river sediments by soxhlet extraction with hexane‐acetone

Abstract

Soxhlet extraction with hexane + acetone (1 + 1 by volume) was used for the extraction of organochlorine pesticide residues from river sediments, followed by Florisil column chromatography clean‐up and determination by gas chromatography with an electron‐capture detector. Average recoveries exceeding 90 % were obtained using this technique. Organochlorine pesticide residue levels in sediment samples from two major rivers flowing through predominantly rice‐growing areas were determined by this method. Relatively high residue levels of organochlorine pesticides such as HCH, heptachlor and endosulfan were found in the sediments.

Pollution by hexachlorobenzene and pentachlorophenol in the coastal plain of São Paulo state, Brazil

“…Predictions about the distribution and fate of such substances in the field are mainly based on theoretical models and extrapolations from laboratory studies, and little is known about how these pollutants actually move in the field (Alberici and Jardim, 1994;Oehme et al, 1994;Tan and Vijayaletchumy, 1994;Masunaga et al, 1996;Lee et al, 2001). Thus, there is a need for studies that take into account spatial distribution patterns by HCB and PCP in polluted areas.…”

Ultrasonication followed by single‐drop microextraction combined with GC/MS for rapid determination of organochlorine pesticides from fish

“…Soxhlet extraction (SE) [7,8], supercritical fluid extraction [9,10], pressurized liquid extraction [11 -13], microwave-assisted solvent extraction [14,15] and ultrasonic extraction [16,17] are most useful sample preparation procedures for the isolation and preconcentration of analytes from sample solutions. All these methods need time consuming procedures, large amounts of organic solvents and complex processes for sample preparation.…”

A Simplified Method for Determination of Pentachlorophenol and Hexachlorobenzene in Soil Contaminated by Industrial Chemical Residues

“…Soil ash content was determined by the weight loss after burning the samples at 550 • C for 4 h and total organic carbon (TOC) performed in a Schimadzu TOC-5000 oven. Samples, 10 g of soil, were extracted using the standard Soxhlet extraction method and n-hexane solvent (Lanças, 2003;Tan and Vijayaletchumy, 1994). The extracts were concentrated and then cleaned by using adsorption chromatography (Florisil).…”