Microwave assisted solvent extraction and coupled-column reversed-phase liquid chromatography with UV detection

Hogendoorn, E.A.; Huls, R. Van De; Dijkman, Ellen; Hoogerbrugge, R

doi:10.1016/s0021-9673(01)01202-x

Cited by 60 publications

(17 citation statements)

References 16 publications

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“…60-90% recoveries were obtained for acidic pesticides in organic matter -rich soil cleaned online with RAM-C 18 internal reverse phase GFF-II columns (Hogendoorn et al, 2001). …”

Section: Restricted Access Materials (Rams)mentioning

confidence: 99%

Modern Sample Preparation Techniques for Pesticide Analysis

Mmualefe¹,

Mpofu²,

Torto³

2011

Pesticides in the Modern World - Trends in Pesticides Analysis

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“…60-90% recoveries were obtained for acidic pesticides in organic matter -rich soil cleaned online with RAM-C 18 internal reverse phase GFF-II columns (Hogendoorn et al, 2001). …”

Section: Restricted Access Materials (Rams)mentioning

confidence: 99%

Modern Sample Preparation Techniques for Pesticide Analysis

Mmualefe¹,

Mpofu²,

Torto³

2011

Pesticides in the Modern World - Trends in Pesticides Analysis

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“…[12][13][14] In both cases, metabolism was initiated by hydrolysis of the cyano group to the carboxylate. 15,16 Chromatographic methods are laborious and time consuming, and require sophisticated equipment available in only wellequipped centralized laboratories. 17,18 Here, we report on a rapid spectrophotometric method for the determination of bromoxynil herbicide.…”

Section: 5-dibromo-4-hydroxybenzonitrilementioning

confidence: 99%

Flow Injection Spectrophotometric Determination of Bromoxynil Herbicide by Diazotization Method

2006

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A flow injection spectrophotometric method is proposed for the determination of bromoxynil herbicide. Bromoxynil was hydrolyzed with HCl and the resulting product, 3,5-dibromo-4-hydroxyaniline, was diazotized with nitrite and coupled with aniline. The absorbance of the azo dye was measured at 500 nm. The conditions were optimized for diazotization using FIA. The range of linearity was found to be 0.01 to 5 ppm with a molar absorptivity of 1.27 × 10 5 L mol -1 cm -1 . The % recovery for the determination of bromoxynil was found to be 91%. The sampling frequency was 80 samples per hour for FIA. The method is simple, fast, and has been successfully applied to the determination of bromoxynil in commercial formulations and food samples.

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“…2 There are methods for the determination in atmospheric samples (gas and particles), 3 crops, 4 water, [5][6][7][8][9][10][11] from biological origins, 12 wines with a solid-phase extraction (SPE), 13 soils, [14][15][16] foodstuffs 17,18 or plants. 15 Electrochemical detection has been combined with HPLC for the determination of Bromoxynil and Ioxynil in barley.…”

Section: Introductionmentioning

confidence: 99%

Chemiluminescent Determination of the Pesticide Bromoxynil by On-line Photodegradation in a Flow-Injection System

et al. 2006

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IntroductionBromoxynil (3,5-dibromo-4-hydroxybenzonitrile) is a nitrile herbicide 1 that is used for the post-emergent control of annual broad-leaf weeds, especially in cereal, corn, sorghum, flax, onions, mint and non-cropland. This pesticide acts to inhibit photosynthesis in the target plants. The molecular structure is shown in Fig. 1.Most of the reported analytical methods for the determination of Bromoxynil are chromatographic, often in tandem with mass spectrometry, with UV detection, or even a combination of both.2 There are methods for the determination in atmospheric samples (gas and particles), 3 crops, 4 water, 5-11 from biological origins, 12 wines with a solid-phase extraction (SPE), 13 soils, [14][15][16] foodstuffs 17,18 or plants. 15 Electrochemical detection has been combined with HPLC for the determination of Bromoxynil and Ioxynil in barley. 19Two capillary electrophoresis methods 20,21 provided with solid-phase extraction have been proposed for Bromoxynil determination in the analysis of water samples.Although separative methods are by far the most commonly used; some attempts for direct determination have been published. Abubaker et al. 22 proposed peroxyoxalate chemiluminescence for the determination of phenol herbicides in soil. An ester is formed by a reaction with anhydride triethylamine and oxalyl chloride in tetrahydrofuran (THF). After eliminating of the supernatant liquid phase under a vacuum, a re-dissolution in THF containing 9,10-diphenylanthracene was implemented and the injection of H2O2 into a standard quartz spectrophotometer cell yielded light emission, which was measured at two different time intervals of 1 and 3 s. However, the linear range was observed for quite high concentrations, over the range of 10 -100 mg l -1 .Phosphorescence has been also used. 23 The spectra (264 and 420 nm for excitation and emission, respectively) were recorded in ether-isopentane-ethanol (5:5:2) at 77 K. A linear behavior was found in the range from 0.2 (quantitation limit) to 7.5 mg l -1 of Bromoxynil. Finally, a Photosystem II-based biosensor have been proposed by Koblizek et al. 24 This present paper contributes to the non-separation methods for the Bromoxynil determination. The selected detector was a luminometer; due to direct chemiluminescence, it provides a strong oxidant and has proved to be a highly sensitive method that is applicable over a wide range of concentrations and with very low detection limits. 25,26 To obtain the emitter product, online irradiation with UV light was used, as a clean reactive for derivatization. The UV irradiation proved to be an easy and clean way of derivatization to obtain fluorometric 27-29 or chemiluminescent structures. 30-32 A discussion of possible photoproducts is included. In order to automate the method, a flow injection analysis (FIA) manifold was developed. A new, robust and simple method is proposed for the chemiluminescent determination of the pesticide Bromoxynil. The empirical procedure is performed with the aid of a flow-injection manifol...

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Microwave assisted solvent extraction and coupled-column reversed-phase liquid chromatography with UV detection

Cited by 60 publications

References 16 publications

Modern Sample Preparation Techniques for Pesticide Analysis

Modern Sample Preparation Techniques for Pesticide Analysis

Flow Injection Spectrophotometric Determination of Bromoxynil Herbicide by Diazotization Method

Chemiluminescent Determination of the Pesticide Bromoxynil by On-line Photodegradation in a Flow-Injection System

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