High sensitivity on-site early warning system monitoring of pesticides by photo-induced fluorescence.

Autor: Diop NA; OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France; Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Senegal., Diouf D; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Bodian EHT; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Faye C; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Bakhoum JP; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Thiare DD; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Diaw PA; Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Senegal., Gaye-Seye MD; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Coly A; Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal., Le Jeune B; OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France., Giamarchi P; OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France. Electronic address: philippe.giamarchi@univ-brest.fr.
Jazyk: angličtina
Zdroj: Analytica chimica acta [Anal Chim Acta] 2023 Apr 15; Vol. 1250, pp. 340969. Date of Electronic Publication: 2023 Feb 13.
DOI: 10.1016/j.aca.2023.340969
Abstrakt: This paper describes the prototype of an on-site High Sensitivity Early Warning Monitoring System, using Photo-Induced Fluorescence, for pesticide monitoring in natural waters (HSEWPIF). To obtain a high sensitivity, the prototype was designed with four main features. Four UV LEDs are used to excite the photoproducts at different wavelengths and select the most efficient one. Two UV LEDs are used simultaneously at each wavelength to increase the excitation power and then the fluorescence emission of the photoproducts. High-pass filters are used to avoid the saturation of the spectrophotometer and to increase the signal-to-noise ratio. The HSEWPIF prototype also employs UV absorption to detect any occasional increase of suspended and dissolved organic matter, which could disrupt the fluorescence measurement. The conception of this new experimental set-up is explained and described, then analytical applications are carried out online for the determination of fipronil and monolinuron. We obtained a linear calibration range from 0 to 3 μg mL -1 with limits of detection of 1.24 ng mL -1 for fipronil and 0.32 ng mL -1 for monolinuron. A mean recovery of 99.2% for fipronil and 100.9% for monolinuron show that the method is accurate, moreover a standard deviation of 1.96% for fipronil and 2.49% for monolinuron show that the method is repeatable. Compared to other methods for the determination of pesticides by photo-induced fluorescence, the HSEWPIF prototype has good sensitivity with better limits of detection, and good analytical performances. These results show that HSEWPIF can be used for monitoring pesticide in natural waters to protect industrial facilities against accidental contamination.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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