Methods for the determination of maleic hydrazide, ethoxyquin and thiabendazole in wastewaters

Victor, D.M.; Hall, Rex E.; Shamis, Jeff D.; Whitlock, Stuart A.

doi:10.1016/s0021-9673(00)96277-0

Cited by 14 publications

(1 citation statement)

References 9 publications

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“…ss Some authors determine the maleic hydrazide in tobacco and in tobacco smoke by gas chromatographic procedures, using methyl or trimethylsilyl or alkyl carbonate derivatives (6)(7)(8)(9)(10)(11)(12)(13). Others describe HPLC methods involving purifications by passages through several different resins (14)(15)(16)(17). The purpose of this work is to find the best conditions for detecting and determining in a quick and easy way the total maleic hydrazide in tobacco leaf and in cigarette filler by the aid of HPLC.…”

Section: Discussionmentioning

confidence: 99%

Determination of Free and Bound Maleic Hydrazide Residues in Tobacco by High Performance Liquid Chromatography

Dattilo¹,

Gallo²,

Lionetti³

et al. 1994

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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A new method is described for the qualitative and quantitative determination of both free and bound maleic hydrazide residues in tobacco leaves and cigarette filler by high performance liquid chromatography. Analyses were carried out by hydrolyzing samples of ground tobacco with 4 N hydrochloric acid for 40 minutes under reflux followed by sample chromatography, running isocratic elutions with a dilute solution of phosphoric acid. The quantitative determination of maleic hydrazide was performed by light absorption at 320 nm, by the calibration curve method. Recoveries of maleic hydrazide added to tobacco samples were greater than 90 %. The detection limit of the method, determined on ground tobacco leaves, was at least 5 ppm. The results obtained by this procedure and by the ISO standard method no. 4876 are in good accordance.

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Section: Discussionmentioning

confidence: 99%

Determination of Free and Bound Maleic Hydrazide Residues in Tobacco by High Performance Liquid Chromatography

Dattilo¹,

Gallo²,

Lionetti³

et al. 1994

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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Flow Injection Analysis of Maleic Hydrazide Using an Electrochemical Sensor Based on Palladium‐Dispersed Carbon Paste Electrode

et al. 2007

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A new analytical methodology for the electrochemical detection of the herbicide maleic hydrazide (3,6-dihydroxypyridazine) by flow injection analysis is presented. This method is supported by the novel application of a palladium-dispersed carbon paste electrode as an amperometric sensor for this herbicide. Maleic hydrazide shows anodic electrochemical activity on carbon-based electrodes (glassy carbon or carbon paste electrodes) in all the pH range. This electrochemical activity is enhanced using metal-dispersed carbon paste electrodes, especially at Pddispersed CPE which displays good oxidation signals at 690 mV (0.050 M phosphate buffer pH 7.0), 140 mV lower than at unmodified electrodes. Under the optimized conditions, the electroanalytical performance of Pd-dispersed CPE in flow injection analysis was excellent, with good reproducibility (RSD 3.3%) and a wide linear range (1.9 Â 10 À7 to 1.0 Â 10 À4 mol L À1 ). A detection limit of 1.4 Â 10 À8 mol L À1 (0.14 ng maleic hydrazide) was obtained for a sample loop of 100 mL at a fixed potential of 700 mV in 0.050 M phosphate buffer solution at pH 7.0 and a flow rate of 2.0 mL min À1. The proposed method was applied for the maleic hydrazide detection in natural drinking water samples.

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Determination of Maleic Hydrazide in Potato Samples Using Capillary Electrophoresis with Dual Detection (UV‐Electrochemical)

et al. 2008

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A new method for the separation of a mixture of different herbicides (propham, chlorpropham, asulam, metamitron, linuron, and maleic hydrazide) using MEKC is proposed. A base-line separation for the mixture of herbicides is achieved in less than six minutes. The detection limits obtained for all the herbicides were lower than 1.0 mM using UV detection. This separation method was used for the determination of maleic hydrazide in potato samples. If a dual (UV-electrochemical) detection system is employed, chlorpropham can be also detected. The results obtained showed that electrochemical detection was ten folds more sensitive than UV detection for maleic hydrazide. The detection limit of the proposed method for maleic hydrazide employing electrochemical detection was 1.3 mg g À1, this value is lower than 50 mg g À1 , which is the maximum residue level permitted for this plant growth regulator in potato samples. The results obtained in the work clearly demonstrate the advantage of using electrochemical detection coupled to capillary electrophoresis, using this detection the concentration limits are not compromised by miniaturization and the components required are simple and inexpensive.

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Methods for the determination of maleic hydrazide, ethoxyquin and thiabendazole in wastewaters

Cited by 14 publications

References 9 publications

Determination of Free and Bound Maleic Hydrazide Residues in Tobacco by High Performance Liquid Chromatography

Determination of Free and Bound Maleic Hydrazide Residues in Tobacco by High Performance Liquid Chromatography

Flow Injection Analysis of Maleic Hydrazide Using an Electrochemical Sensor Based on Palladium‐Dispersed Carbon Paste Electrode

Determination of Maleic Hydrazide in Potato Samples Using Capillary Electrophoresis with Dual Detection (UV‐Electrochemical)

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