Monitoring of herbicides in river water by gas chromatography-mass spectrometry and solid-phase extraction

Tanabe, Akiko; Mitobe, Hideko; Kawata, Kuniaki; Sakai, Masaaki

doi:10.1016/s0021-9673(96)00221-x

Cited by 55 publications

(22 citation statements)

References 16 publications

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“…Preparations of β-1, β-2, β-3, γ -1, γ -2, γ -3, and γ - 4 The host compounds (β -1, β-2, β-3, γ -1, γ -2, γ -3, and γ -4) were prepared according to previously reported procedures. 10 …”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] However, it is urgent to quickly and conveniently confirm the existence of endocrine-disrupting chemicals in rivers and lakes. In a previous paper, we discussed the first example of fluorescent molecular sensing for endocrine-disrupting chemicals and dioxin analogs by homo fluorescent β-and γ -cyclodextrins, which were modified with bis fluorescent-active units such as dansyl or anthranilate.…”

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confidence: 99%

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Fluorescent Molecular Recognition for Endocrine-Disrupting Chemicals and Their Analogs by Fluorescent Hetero-Modified Cyclodextrins

2000

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The detection of endocrine-disrupting chemicals required high technology, such as an analysis by GC/MS, which is very costly, and the analytical results require many days to obtain. [1][2][3][4][5][6][7][8] However, it is urgent to quickly and conveniently confirm the existence of endocrine-disrupting chemicals in rivers and lakes. In a previous paper, we discussed the first example of fluorescent molecular sensing for endocrine-disrupting chemicals and dioxin analogs by homo fluorescent β-and γ -cyclodextrins, which were modified with bis fluorescent-active units such as dansyl or anthranilate. 9 In the present study, endocrine-disrupting chemicals, including p-nonylphenol and bisphenol A, and a dioxin analog, such as 2,4,6-trichlorophenol, were conveniently and directly detected by these fluorescent cyclodexstrins with high sensitivity and selectivity; pattern recognition of endocrinedisrupting chemicals would be expected to be possible. Furthermore, it was obvious that bis anthranilate-modified β-cyclodextrins can detect 10 -6 M of p-nonylphenol. We have previously discussed the synthesis of regioselectively fluorescent hetero-substituted cyclodextrins, which are 6 A -dansyl-6 X -tosylmodified β-cyclodextrins (X=B or G, C or F, and D or E) and 6 A -dansyl-6 X -tosyl-modified γ -analogs (X=B or H, C or G, D or F, and E), and examined of their fluorescent molecular-sensing abilities for organic compounds, such as bile acids and terpenes. 10 In this system, these hosts exhibited higher sensitive and selective molecular recognition ability for ursodeoxycholic acid, chenodeoxycholic acid and (-)-borneol compared to monoand di-dansyl-modified β-and γ -analogs, which were reported previously. [11][12][13][14] As a further extension of our work, we investigated the fluorescence spectral changes of the titled hosts, fluorescent hetero-modified cyclodextrins, concerning the accommodation of endocrine-disrupting chemicals. In this paper, we wish to describe the fluorescent-sensing abilities of these host compounds for environmental hormones. These hetero-modified hosts detect bisphenol A and 2,4,6-trichlorophenol with high sensitivity and selectivity. ExperimentalPreparations of β-1, β-2, β-3, γ -1, γ -2, γ -3, and γ -4The host compounds (β -1, β-2, β-3, γ -1, γ -2, γ -3, and γ -4) were prepared according to previously reported procedures. 10 MeasurementsThe fluorescence spectra were measured at 25˚C with a Perkin Elmer LS 40B fluorescence spectrometer. In fluorescence measurements, the excitation wavelength of the fluorescence spectra was 340 nm and the excitation and emission slits were 10 nm. An ethylene glycol aqueous solution (10 vol.%) was used as the solvent for hosts for spectroscopic measurements, because their solubility in pure water is poor. Five microliters of guest species (500, 50 and 5 mM) in dimethyl sulfoxide (DMSO) or MeOH were injected into a 10 vol.% ethylene glycol aqueous solution of the host (2.5 mL) to make a sample solution with a host concentration of 1×10 -6 M and guest concentrations of 0.0...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Fluorescent Molecular Recognition for Endocrine-Disrupting Chemicals and Their Analogs by Fluorescent Hetero-Modified Cyclodextrins

2000

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“…The simazine-degrading capability of the enriched charcoal was maintained for nearly 2 years. 4) Thus, Charcoal A100 enriched with CD7 is considered to be an effective material for bioremediation; however, CD7 and strain CDB21 could not degrade methylthio-s-triazines detected in river water, 3,6) a lake basin, 7) and river sediments, 8) while Rhodococcus sp. FJ1117YT 9) can transform methylthio-s-triazines to their hydroxyl analogues via sulfur oxidation, and accumulate hydroxy-striazines.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous biodegradation of chloro- and methylthio-s-triazines using charcoal enriched with a newly developed bacterial consortium

et al. 2008

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A special type of charcoal, Charcoal A100, was enriched with a newly developed bacterial consortium using a perfusion method. The bacterial consortium consisted of a methylthio-s-triazine-degrading bacterium (Rhodococcus sp. FJ1117YT) and the chloros-triazine-degrading bacterial consortium CD7 (containing Bradyrhizobium japonicam CSB1, Arthrobacter sp. CD7w and b-Proteobacteria CDB21). Enriched charcoal was capable of degrading chloro-s-triazines (simazine and atrazine) and methylthio-s-triazines (simetryn and dimethametryn) simultaneously in sulfur-free medium. Almost complete degradation was observed after 4-day cultivation of chloro-s-triazines and 9-day cultivation of methylthio-s-triazines. These triazines were mineralized via their 2-hydroxy analogues.

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“…Many mono and multi residue chromatographic methods for oxadiazon are available in the litreature. [2][3][4][5] Several methods for the determination of trace amounts of pesticides require the concentration of large volumes of sample by liquid-liquid extraction (LLE) or solidphase extraction (SPE). Solid-phase microextraction (SPME) is an alternative technique that involves direct extraction of the analytes with the use of a small diameter, optical fibre coated with a polymeric stationary phase and housed in a syringe assembly for protection.…”

Section: Introductionmentioning

confidence: 99%

Application of ultrasound-assisted emulsification microextraction followed by gas chromatography for determination of oxadiazon in water and soil samples

Semnani¹,

Haddadi²,

Rezaee³

et al. 2015

S.Afr.j.chem

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In this study, a simple and efficient ultrasound-assisted emulsification microextraction (USAEME) method combined with gas chromatography (GC) was developed for the preconcentration and determination of oxadiazon in water and soil samples. In this method, fine droplets of toluene were formed and dispersed in the sample with the help of ultrasonic waves which accelerated the formation of a fine cloudy solution without using disperser solvents. Several factors influencing the extraction efficiency, such as the nature and volume of organic solvent, extraction temperature, ionic strength and centrifugation time, were investigated and optimized. Using optimum extraction conditions a detection limit of 0.1 µg L -1 and a good linearity in a calibration range of 0.25-250 µg L -1 were achieved for the analyte in a river water sample. This proposed method was successfully applied to the analysis of oxadiazon in water and soil samples.

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Monitoring of herbicides in river water by gas chromatography-mass spectrometry and solid-phase extraction

Cited by 55 publications

References 16 publications

Fluorescent Molecular Recognition for Endocrine-Disrupting Chemicals and Their Analogs by Fluorescent Hetero-Modified Cyclodextrins

Fluorescent Molecular Recognition for Endocrine-Disrupting Chemicals and Their Analogs by Fluorescent Hetero-Modified Cyclodextrins

Simultaneous biodegradation of chloro- and methylthio-s-triazines using charcoal enriched with a newly developed bacterial consortium

Application of ultrasound-assisted emulsification microextraction followed by gas chromatography for determination of oxadiazon in water and soil samples

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