Postcolumn photolysis of pesticides for fluorometric determination by high-performance liquid chromatography

Cj, Miles; Ha, Moye

doi:10.1021/ac00154a007

Cited by 89 publications

(36 citation statements)

References 16 publications

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“…Liquid chromatography has been widely used to quantify propanil [3,[11][12][13][14]. There is a loss of selectivity and sensitivity in comparison to gas chromatography, but this is compensated by minimisation of thermal decomposition and preservation of the speciation of the compounds in the sample.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of propanil and related N-substituted amides

Garrido

Lima

Delerue–Matos

et al. 2001

Analytica Chimica Acta

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The electrochemical behaviour of propanil and related N-substituted amides (acetanilide and N,N-diphenylacetamide) was studied by cyclic and square wave voltammetry using a glassy carbon electrode. Propanil has been found to have chemical stability under the established analytical conditions and showed an oxidation peak at +1.27 V versus Ag/AgCl at pH 7.5. N,N-diphenylacetamide has a higher oxidation potential than the other compounds of +1.49 V versus Ag/AgCl. Acetanilide oxidation occurred at a potential similar to that of propanil, +1.24 V versus Ag/AgCl. These results are in agreement with the substitution pattern of the nitrogen atom of the amide. A degradation product of propanil, 3,4-dichloroaniline (DCA), was also studied, and showed an oxidation peak at +0.66 V versus Ag/AgCl. A simple and specific quantitative electroanalytical method is described for the analysis of propanil in commercial products that contain propanil as the active ingredient, used in the treatment of rice crops in Portugal.

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Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of propanil and related N-substituted amides

Garrido

Lima

Delerue–Matos

et al. 2001

Analytica Chimica Acta

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“…However, some authors have found that, in the photodegradation pathways of phenylurea herbicides, one of the photoproducts formed is methylamine or dimethylamine [18,19]. In this respect, it was also reported that aniline and substituted anilines present fluorescence spectra similar to those of the phenylurea photodegradation products, suggesting that similar structures may be responsible for the fluorescence response observed [16].…”

Section: Introductionmentioning

confidence: 95%

“…In the analysis of a variety of pesticides, including neburon, HPLC postcolumn photolysis and fluorogenic labelling with OPA/2-ME, was also utilized [16]. PIF detection coupled with FIA has been proposed for the determination of a phenylurea derivative (diflubenzuron) and other aromatic pesticides [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Usefulness of micellar media for the quantitative analysis of phenylurea herbicides in water by photochemically-induced fluorescence

et al. 1999

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Abstract. UV irradiation of four non-fluorescent phenylurea herbicides including linuron, diuron, isoproturon and neburon is shown to yield fluorescent photoproducts. The photochemically-induced fluorescence (PIF) properties of these herbicides in several media (water, 2-propanol and their mixtures) and aqueous micellar solutions of sodium dodecyl sulfate (SDS), and cetyltrimethylammonium chloride (CTAC) are reported. The use of micellar media enhances significantly the PIF signal relative to an aqueous solution. A PIF method is developed for the determination of the four herbicides under study, with linear dynamic ranges over about one order of magnitude, and limits of detection (LOD) between 410 and 640 ng mL -1 , according to the compound. Applications to the analysis of tap water and river water samples yield satisfactory recoveries (86-115 %).

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“…Most methods reported in the literature are chromatographic techniques, particularly gas [2,3,4,5,6] and liquid chromatography [1,7,8,9,10,11,12]. Determinations of BTZ using these conditions are time-consuming, because samples require previous physical treatment before assay; these procedures are, therefore, not considered satisfactory for routine determinations.…”

Section: Introductionmentioning

confidence: 99%

Development of an FIA system with amperometric detection for determination of bentazone in estuarine waters

Cerejeira¹,

Delerue–Matos²,

Vaz³

2002

Anal Bioanal Chem

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On the basis of its electrochemical behaviour a new flowinjection analysis (FIA) method with ampero-metric detection has been developed for quantification of the herbicide bentazone (BTZ) in estuarine waters. Standard solutions and samples (200 L) were injected into a water carrier stream and both pH and ionic strength were automatically adjusted inside the manifold. Optimization of critical FIA conditions indicated that the best analytical results were obtained at an oxidation potential of 1.10 V, pH 4.5, and an overall flow-rate of 2.4 mL min -1 . Analysis of real samples was performed by means of calibration curves over the concentration range 2.510 -6 to 5.010 -5 mol L -1 , and results were compared with those obtained by use of an independent method (HPLC). The accuracy of the amperometric determinations was ascertained; errors relative to the comparison method were below 4% and sampling rates were approximately 100 samples h -1 . The repeatability of the proposed method was calculated by assessing the relative standard deviation (%) of ten consecutive determinations of one sample; the value obtained was 2.1%.

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Postcolumn photolysis of pesticides for fluorometric determination by high-performance liquid chromatography

Cited by 89 publications

References 16 publications

Electrochemical oxidation of propanil and related N-substituted amides

Electrochemical oxidation of propanil and related N-substituted amides

Usefulness of micellar media for the quantitative analysis of phenylurea herbicides in water by photochemically-induced fluorescence

Development of an FIA system with amperometric detection for determination of bentazone in estuarine waters

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