FI-photoinduced Chemiluminescence Method for Diuron Determination in Water Samples

Abstract

A new method for the determination of the herbicide diuron, using a flow injection manifold and photoinduced chemiluminescence detection, is presented. The pesticide, in basic medium, was irradiated on-line with UV light (254 nm) for 53 s. A short discussion about the possible irradiation products is included. The chemiluminescent response of the photoproducts was induced by oxidation with potassium ferricyanide in phosphate buffer at pH 11.5. The method permitted the quantification of diuron over the 0.1 -4.0 mg L -1 range, with a detection limit (S/N = 3) of 20 μg L -1 when the method was applied directly. However, the use of solid phase extraction (SPE) performed with C18 cartridges allowed us to achieve a limit of detection of 0.4 μg L -1 and a 1.5 -30 μg L -1 dynamic range. The method was successfully applied to the diuron determination in samples of water from different sources (spring, ground, mineral, irrigation, sea and tap waters) with a low consumption of reagents.

Fast Determination of Thiacloprid by Photoinduced Chemiluminescence

“…Diuron photoproducts have been reported as chemiluminescent when oxidized 38 ; although a different oxidant system was used (potassium ferricyanide in phosphate buffer at pH 11.5) in that method, a slight CL with cerium was also reported, but the concentrations of oxidant needed were higher in that case. Consequently, the decrease in the CL observed should be probably due to a cerium consumption by diuron.…”

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 .…”

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

“…Due to the high sensitivity of the technique, low detection limits can be reached with a wide range of linearity. In recent years, there have been proposed in the 4 literature a wide variety of flow-injection chemiluminescence (FI-CL) methods that allow rapid, selective and sensitive determination of pesticides such as diuron [19], paraquat [20], imazalil [21], thiram [22], asulam [23], diquat [24], carbofuran and promecarb [25,26 ], carbaryl [27] and pirimicarb [28] among others. However, to the authors' knowledge, none has been described the FI-CL method for the determination of Fenamiphos nematicide in the literature for any.…”