Supercritical fluid extraction of pesticides from forestry matrices
Titel:
Supercritical fluid extraction of pesticides from forestry matrices
Auteur:
Sundaram, K. M. S. Nott, R.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 30 (1995) nr. 2 pagina's 175-200
Jaar:
1995
Inhoud:
A simple and inexpensive home-made supercritical fluid extraction (SFE) apparatus is described. Using conventional solvents of different polarity and solvent strength as supercritical fluids, extractions of fenitrothion and aminocarb residues from forest soil and conifer foliage were conducted. Analysis of the extracts was done by capillary gas chromatography (GC) after necessary partition and cleanup steps. Experiments were carried out to study the effects of pressure, temperature, flow rate, sample size, analyte concentration and matrix type on extraction efficiencies. The recovery data are presented and compared with the results obtained from Sorvalf® extraction. Sorvall extraction of the pesticides from the two matrices using ethyl acetate, methanol and acetonitrile gave quantitative recoveries and were > 93 %. However, the recoveries using hexane were less quantitative and averaged only about 76 %. Methanol and acetonitrile functioned well as extractants in SFE and the recoveries were > 94 %, but the recovery levels in the other two solvents were < 90 %. Suitability and limitations of SFE as the sample preparation method for forestry matrices in residue analysis, using conventional solvents as supercritical fluids, are discussed.
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