Sensitive determination of Fenamiphos in water samples by flow injection photoinduced chemiluminescence

Abstract

In this work, a sensitive flow injection chemiluminescence (FI-CL) method for the determination of nematicide Fenamiphos in a rapid and simple way is proposed.Fenamiphos is firstly photodegraded in basic medium. These photofragments react with Ce(IV) providing the chemiluminescence signal. To the authors' knowledge, no chemiluminescence method has been described in the literature for the determination of the nematicide Fenamiphos. All physical and chemical parameters in the flow injection chemiluminescence system were optimized in order to obtain the best sensitivity, selectivity and sample throughput. Before the injection of the sample in the FI-CL system, a preconcentration step with solid phase extraction C18 cartridges was performed. By applying SPE to 250 mL of standard (final volume 10 mL), the linear dynamic range was between 3.4 and 60 µg L -1 , and the detection limit was 1 µg L -1 .When SPE was applied to 500 mL of standard (final volume 10 mL), the detection limit was 0.5 µg L -1 . These detection limits are below the emission limit value established by the Spanish Regulations of the Hydraulic Public Domain for pesticides (50 µg L -1 ) and of the same order as the limit established for total pesticides (0.5 µg L -1 ) at EuropeanDirective on the quality of water for human consumption. The sample throughput was 126 hour -1 . Intraday and interday coefficients of variation were below 10% in all cases.No interference was registered in presence of usual concentrations of anions, cations and other organophosphorus pesticides. The method was successfully applied to the analysis of environmental water samples, obtaining recoveries between 96 and 107.5%.

Determination of organothiophosphorus pesticides in water by liquid chromatography and post-column chemiluminescence with cerium(IV)

“…In fact, CL has been gaining increasing acceptance and has been used to determine OPPs residues in recent years [9][10][11][12][13][14][15]. Nevertheless, practical application of the HPLC-CL technique for the determination of pesticides is still uncommon.…”

Fast Determination of Thiacloprid by Photoinduced Chemiluminescence

“…The relative errors showed in both tables were obtained using 40 ng When the effect of other pesticides on the CL signal was tested, it was found that dimethoate, fenamiphos and methomyl showed a strong interfering effect. That result was expected, since an important CL response for the photoproducts of all of them when oxidized by cerium (IV) have been previously reported 21,[36][37] . Bearing in mind that fact, the use of a separative technique, such as LC, prior to analysis should be advisable when those pesticides are together with thiacloprid; thus, apart from their separation, their simultaneous determination should be achieved.…”

A critical review on photochemical conversions in flow analysis

“…A C C E P T E D ACCEPTED MANUSCRIPT 36 fungicides [159], bromoxynil [160], fenamiphos [161], norfloxacin [162], triclosan [163], diuron [164], vitamins A and C [165], 4-chloro-2-methylphenoxyacetic acid (MCPA) [166] and isoamyl nitrite [167] with LDs as low as 0.02 µmol L -1 .…”

“…photolithography and deep reactive ion etching [43]) are not promptly available in chemical labs, thus hindering the wide diffusion. In this sense, simpler and inexpensive approaches for production of microfluidic devices[32,161] or…”