Determination of two phototransformation products of bentazone using quadrupole time-of-flight mass spectrometry

Peschka, Manuela; Petrović, Mira; Knepper, Thomas P.; Barceló, Damià

doi:10.1007/s00216-007-1349-1

Cited by 30 publications

(16 citation statements)

References 14 publications

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“…Peschka et al [29], using experimental conditions similar to ours, observed complete photodegradation and formation of SO 3 -bentazon after 13.4 h in pure water, with a DT 50 about 4 h. Davezza et al [30] obtained the complete degradation of Btz after 60 min, and its DT 50 at about 15 min, when using a Xenon lamp of 1500 W m −2 and pyrex glass containers instead of quartz ones.…”

Section: Resultssupporting

confidence: 71%

Cyclodextrin Inclusion Complex to Improve Physicochemical Properties of Herbicide Bentazon: Exploring Better Formulations

et al. 2012

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The knowledge of the host-guest complexes using cyclodextrins (CDs) has prompted an increase in the development of new formulations. The capacity of these organic host structures of including guest within their hydrophobic cavities, improves physicochemical properties of the guest. In the case of pesticides, several inclusion complexes with cyclodextrins have been reported. However, in order to explore rationally new pesticide formulations, it is essential to know the effect of cyclodextrins on the properties of guest molecules.In this study, the inclusion complexes of bentazon (Btz) with native βCD and two derivatives, 2-hydroxypropyl-β-cyclodextrin (HPCD) and sulfobutylether-β-cyclodextrin (SBECD), were prepared by two methods: kneading and freeze-drying, and their characterization was investigated with different analytical techniques including Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), X-ray diffractometry (XRD) and differential pulse voltammetry (DPV). All these approaches indicate that Btz forms inclusion complexes with CDs in solution and in solid state, with a stoichiometry of 1∶1, although some of them are obtained in mixtures with free Btz. The calculated association constant of the Btz/HPCD complex by DPV was 244±19 M−1 being an intermediate value compared with those obtained with βCD and SBECD. The use of CDs significantly increases Btz photostability, and depending on the CDs, decreases the surface tension. The results indicated that bentazon forms inclusion complexes with CDs showing improved physicochemical properties compared to free bentazon indicating that CDs may serve as excipient in herbicide formulations.

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Section: Resultssupporting

confidence: 71%

Cyclodextrin Inclusion Complex to Improve Physicochemical Properties of Herbicide Bentazon: Exploring Better Formulations

et al. 2012

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“…LC-(Q)TOF MS has been used to study the photodegradation of triazine herbicides in water [50], pesticides belonging to different chemical classes [74], bentazone [75] and fenhexamid [76], in water, and imazaquin in soil [77], among others. Recent studies have also been focused on identification of pharmaceuticals and drugs of abuse, because of increasing concern of potential negative effects in the environment.…”

Section: Environmental Applications Of Lc-hrmsmentioning

confidence: 99%

Current use of high-resolution mass spectrometry in the environmental sciences

et al. 2012

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“…1), the effect of different organized assemblies in its fluorescence signal was analyzed. 5 Peschka et al 6 reported that BTZ represents one of the most applied herbicides in the Ebro river delta (Spain), which holds a network of irrigation and drainage channels, where the concentration of BTZ reaches a mean concentration of 31 ng mL À1 during the application time from May to August. 3 In a recent ground water monitoring study for polar organic persistent pollutants in European countries, 4 BTZ showed to be one of the most relevant chemicals found, with a frequency of detection of 32% and a maximum concentration of 11 ng mL À1 .…”

Section: Introductionmentioning

confidence: 99%

Spectrofluorimetric study of the herbicide bentazone in organized media: analytical applications

Porini

Escandar

2011

Anal. Methods

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The present work is devoted to the study of the spectrofluorimetric behavior of the herbicide bentazone in the presence of selected organized assemblies, with the purpose of optimizing the working conditions for its determination in environmental samples. Bentazone is one of the most applied herbicides in countries of profuse agriculture, and belongs to the group of relevant persistent pollutants. Among the studied media, methyl-b-cyclodextrin produced the largest fluorescence signals for bentazone, and was selected as auxiliary reagent for the quantitative analyses. The selectivity of the method, i.e., its capability to measure accurately an analyte in the presence of interferents that may be present in the sample matrix, was improved through second-order multivariate calibration, measuring excitationemission fluorescence matrices for both artificial and real samples, and processing them with the algorithm parallel-factor analysis (PARAFAC). A detection limit of 3 ng mL À1 and a relative error of prediction of 5.6% for bentazone were obtained in samples without interferents. In samples containing seven additional agrochemicals acting as interferences, the limit of detection and the relative error of prediction were 5 ng mL À1 and 9.9%, respectively. The method was successfully applied to spiked natural water samples, with statistical parameters in these cases which were similar to those calculated in samples with interferences. In this study, the advantages of coupling fluorescence measurements in organized media and second-order chemometric analysis are exploited in order to rapidly quantify a frequent pollutant at low concentrations in a very interfering medium and using green chemicals.

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Determination of two phototransformation products of bentazone using quadrupole time-of-flight mass spectrometry

Cited by 30 publications

References 14 publications

Cyclodextrin Inclusion Complex to Improve Physicochemical Properties of Herbicide Bentazon: Exploring Better Formulations

Cyclodextrin Inclusion Complex to Improve Physicochemical Properties of Herbicide Bentazon: Exploring Better Formulations

Current use of high-resolution mass spectrometry in the environmental sciences

Spectrofluorimetric study of the herbicide bentazone in organized media: analytical applications

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