אסיף מאגר המחקר החקלאי

Simplified fat extraction with sulphuric acid as cleanup procedure for residue determination of chlorinated hydrocarbons in butter

Year:

1978

Source of publication :

Authors :

Volume :

61

Co-Authors:

Veierov, D., Agric. Res. Organ., Pesticide Chem. Residue Res. Lab., Volcani Cent., Bet Dagan, Israel
Aharonson, N., Agric. Res. Organ., Pesticide Chem. Residue Res. Lab., Volcani Cent., Bet Dagan, Israel

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Abstract:

A new cleanup procedure is described for chlorinated hydrocarbon residues in butterfat. The method is based on the dropwise addition of H2SO4 to a fat solution column and continuous removal of the lipids and the acid. The cleanup of 0.25-2.0 g fat requires only 10-40 ml sulfuric acid and 12-17 ml petroleum ether. There is no need for any further cleanup step, solvent evaporation, or centrifugation. The method is easy to standardize and is suitable for automation. At least 30 fat samples can be cleaned up manually by one analyst in one day. Recoveries were complete (>90%) for polychlorinated biphenyl compounds and for 13 chlorinated pesticides of 16 examined. The method was tested on chlorinated hydrocarbon residues in commercial butter and the results were compared with those obtained with the acetonitrile method. The versatility and limitations of the method were investigated by varying the sulfuric acid strength, initial fat solution concentration, and column dimensions.

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