A novel flow-through fluorescence optosensor for the determination of thiabendazole

GISELA N. PICCIRILLI Y GRACIELA M. ESCANDAR

ANALYTICA CHIMICA ACTA

Elsevier

Año: 2007 vol. 601 p. 196 - 203

0003-2670

This paper presents the development of a new flow-injection system combined with solid-surface fluorescence detection for the determination of the widely used fungicide thiabendazole. Nylon powder was probed as a novel solid-support for building the optosensor. The method is based on the on-line immobilization of thiabendazole onto nylon in a continuous flow system, followed by the measurement of its native fluorescence. Aqueous samples are directly injected in a water carrier, resulting in a very simple and economical method. The analytical figures of merit obtained using 1500 uL of sample and 75 % methanol (v/v) as eluting solution were: linear calibration range from 8 to 120 ng/mL (the lowest value corresponds to the quantitation limit), relative standard deviation, 0.9 % (n = 5) at a level of 64 ng/ mL, limit of detection calculated according to 1995 IUPAC recommendations is to 2.8 ng/mL, and sampling rate of 14 samples h–1. The potential interference from other agrochemicals, metal ions and common anions, and the viability of determining thiabendazole in real water samples were also evaluated.