Off-line SFE-CGC-ECD analysis of 2,4-D and Dicamba residues in real sugar cane, rice and corn samples
✍ Scribed by Lanças, Fernando M. ;Rissato, Sandra R. ;Mozeto, Antonio A.
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 406 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Abstract
Determination of 2,4‐D (2,4‐dichlorophenoxyacetic acid) and Dicamba (2‐methoxy‐3,6‐dichlorobenzoic acid) residues in sugar cane, rice, and corn was carried out both by solid liquid extraction (SLE), as already described in the literature, and by a supercritical fluid extraction (SFE) method developed in our laboratory. The extracts were esterified and cleaned‐up by passing through a Florisil column. Extracts were analyzed by high resolution gas chromatography, with electron capture detection. The tested methods presented good recoveries (above 90%); the SFE CO~2~/acetone method showed better extraction efficiencies (extracted 30 % more herbicide in real samples), shorter extraction time and lower organic solvent consumption than the SLE method.