Determination of morestan residues in waters by solid-phase spectrofluorimetry

✍ Scribed by José Luis Vilchez; Ramiro Avidad; Jamal Rohand; Alberto Navalón; Luis Fermín Capitán-Vallvey

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 469 KB
• Volume: 282
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80232-a

✦ Synopsis

Morestan in solution in a neutral medium shows native fluorescence. A method for the determination of trace amounts of morestan in waters by solid-phase spectrofluorimetry is described. Morestan is fixed on C-18 silica-gel, packed in a l-mm silica cell and measured directly with a solid-surface attachment giving fluorescence at A,, = 392 nm for wavelength of excitation A, = 370 run. The applicable concentration range is 1.0-7.0 ng ml-' with a relative standard deviation of 1.9% and a detection limit of 0.15 ng ml-'. The influence of the presence of other pesticides and chemical species has also been studied. The method is found to be more sensitive and selective than other methods proposed in the literature. It was applied to the determination of morestan in natural waters. Recoveries were from 95 to 105%.