Flow injection-FTIR determination of dithiocarbamate pesticides

Cassella, Alessandra R.; Cassella, Ricardo J.; Garrigues, Salvador; Santelli, Ricardo Erthal; Campos, Reinaldo Calixto de; Guárdia, Miguel de la

doi:10.1039/b004504g

Cited by 39 publications

(6 citation statements)

References 15 publications

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“…At low pH, the nitrogen of the carbaryl molecule is protonated, which makes the loss of an electron more difficult, and at a pH above 8 it is hydrolyzed to naphthol analogue, which leads to a sharp decrease in the carbaryl oxidation current [ 30 ]. In further studies, PBS (pH 6.86) was used to determine carbaryl.…”

Section: Resultsmentioning

confidence: 99%

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

et al. 2021

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Laser-reduced graphene oxide (LRGO) on a polyethylene terephthalate (PET) substrate was prepared in one step to obtain the LRGO grid electrode for sensitive carbaryl determination. The grid form results in a grid distribution of different electrochemically active zones affecting the electroactive substance diffusion towards the electrode surface and increasing the electrochemical sensitivity for carbaryl determination. Carbaryl is electrochemically irreversibly oxidized at the secondary amine moiety of the molecule with the loss of one proton and one electron in the pH range from 5 to 7 by linear scan voltammetry (LSV) on the LRGO grid electrode with a scan rate of 300 mV/s. Some interference of the juice matrix molecules does not significantly affect the LSV oxidation current of carbaryl on the LRGO grid electrode after adsorptive accumulation without applied potential. The LRGO grid electrode can be used for LSV determination of carbaryl in fruit juices in the concentration range from 0.25 to 128 mg/L with LOD of 0.1 mg/L. The fabrication of the LRGO grid electrode opens up possibilities for further inexpensive monitoring of carbaryl in other fruit juices and fruits

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Section: Resultsmentioning

confidence: 99%

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

et al. 2021

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“…Thus, in the case of TNA-Ag-M, there exists stronger synergistic effect between TiO 2 nanotube arrays and Ag nanoparticles. (2) The contact between the analytes and Ag nanoparticles would become more effective when Ti mesh is used. On the basis of the experimental results above, we speculate that this remarkable SERS activity of TNA-Ag-M may be related to several factors as follows: (1) the electromagnetic enhancement from the Ag nanoparticles; (2) the strong synergistic effect between TiO 2 nanotube arrays and Ag nanoparticles; (3) more Ag nanoparticles loaded and more effective contact between thiram and the Ag nanoparticles due to the usage of Ti mesh.…”

Section: Resultsmentioning

confidence: 99%

“…Thiram [bis(dimethylthiocarbanoyl) disulfide; Scheme ] is one of the most common fungicides and has been widely used in agriculture. At present, its overuse and misuse lead to the release of thiram residues into nature water, which can cause many public health problems, such as gastrointestinal diseases. , Therefore, it is necessary to fabricate a low-cost and user-friendly sensing platform for routine monitoring of thiram residue in drinking water.…”

Section: Introductionmentioning

confidence: 99%

An Ultrasensitive, Disposable, and “Plug and Play” Surface-Enhanced Raman Scattering Substrate for the In Situ Detection of Trace Thiram in Water

Dou

Qin

et al. 2018

ACS Appl. Nano Mater.

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In this work, TiO2 nanotube arrays were fabricated on Ti meshes via anodic oxidation and decorated with Ag nanoparticles by a photodeposition process. Then the surface-enhanced Raman scattering (SERS) effect of the as-prepared samples for trace thiram was directly investigated in a thiram aqueous solution. The stability and selectivity of our substrates were also explored. In addition, for practical purposes, we further studied the SERS of trace thiram in tap water using the as-prepared sample as a SERS substrate. At last, the surface-enhanced mechanism was discussed preliminarily. It can be found that the Ag-nanoparticle-decorated TiO2 nanotube array on a Ti mesh is an ultrasensitive SERS substrate for trace thiram in water. The detection limits are up to 1 × 10–9 mol L–1 in deionized water and 1 × 10–7 mol L–1 in tap water, respectively. Moreover, this substrate possesses dramatic signal uniformity [relative standard deviation <6% (spot-to-spot)], excellent reproducibility [relative standard deviation <4.7% (batch-to-batch)], high selectivity, and good stability. These results indicate that this inexpensive substrate possesses great potential as a highly sensitive, disposable, and “plug and play” SERS substrate for the in situ detection of trace thiram in drinking water.

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“…Recently, automatic methods using flow analysis (FA) have been developed for pesticide formulation analysis [12,13]. Direct determination of dithiocarbamate pesticides in spiked soil samples by microwave-assisted extraction with chloroform and measurement in solution has also been investigated [14]. On the other hand, FTIR is also employed as detector in high-performance liquid chromatography [15], supercritical fluid chromatography [16] and gas chromatography [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…of 10 mL n-hexane solutions containing all possible ternary combinations of the three selected pesticides at two concentration levels; samples (nos. 9-11) containing only one of the pesticides, samples (nos [12][13][14][15][16][17]. containing binary and ternary combinations at varying concentrations and solutions (nos [18][19][20].…”

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confidence: 99%

Assessment of ftir spectrometry for pesticide screening of aqueous samples

Columé

Diewok

Lendl

2004

International Journal of Environmental Analytical Chemistry

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This article assesses the potential of Fourier transform infrared spectrometry (FTIR) to be used in pesticide screening and determination of selected pyrethroid and organochlorine pesticides in fresh water. FTIR spectra of 28 single pesticides in the dry state were recorded on a horizontal diamond attenuated total reflection (ATR) element. Hierachical cluster analysis of the recorded FTIR spectra (spectral range: 4000-500 cm À1 ) showed that different pesticide groups could be distinguished. A representative of each main group (dichlofuanid, captan and fenpropathrin) was selected and their direct simultaneous determination in fresh water without using a chromatographic separation step investigated. The developed analysis procedure comprised a liquid-liquid extraction step with n-hexane, further automated clean-up and preconcentration by solidphase extraction using a silica mini-column and final elution of the analyte with ethyl acetate. The extract containing the analytes was further concentrated and dried on the ATR element for spectrum acquisition. Using a partial least square (PLS) calibration it could be shown that all three analytes could be quantified in fresh water in a concentration range from 1.2 to 4.8 mg/L. Recoveries for dichlofuanid, captan and fenpropathrin from fortified tap and river waters ranged from 66.3 to 102.0% (captan was the pesticide providing the lowest values, 66.3 and 70.3%).

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Flow injection-FTIR determination of dithiocarbamate pesticides

Cited by 39 publications

References 15 publications

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

An Ultrasensitive, Disposable, and “Plug and Play” Surface-Enhanced Raman Scattering Substrate for the In Situ Detection of Trace Thiram in Water

Assessment of ftir spectrometry for pesticide screening of aqueous samples

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