17 research outputs found
Fast determination of thiacloprid by photoinduced chemiluminescence
This paper was published in Applied Spectroscopy and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/as/abstract.cfm?URI=as-68-6-642. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.A new and sensitive application of the chemiluminescence detection has been developed for the determination of the pesticide thiacloprid in water. It was based on the on-line photoreaction of thiacloprid in basic medium, with quinine acting as sensitizer of the chemiluminescent response; Cerium (IV) in sulfuric acid medium was used as oxidant. A high automation and reproducibility was provided by a flow injection analysis (FIA) manifold. The validation of the method was performed in terms of selectivity, linearity, LOD, precision and accuracy. Liquid chromatography with UV detection was used as reference for mineral, tap, ground and spring water samples. The proposed method is fast (throughput of 130 h-1), sensitive (LOD of 0.8 ng mL-1 without preconcentration steps and 0.08 ng mL-1 with solid phase extraction (SPE)), low-cost and possible to couple with separative methods for the simultaneous determination of other pesticides. The enhanced chemiluminescence intensity was linear with thiacloprid concentration over the (2-80) and (80-800) ng mL-1 ranges. A possible reaction mechanism is also discussed.The authors thank the Ministerio de Educacion y Ciencia of Spain and the Fondo Europeo de Desarrollo Regional for financial support, Project CTM2006-11991.Catalá Icardo, M.; López Paz, JL.; Pérez Plancha, LM. (2014). Fast determination of thiacloprid by photoinduced chemiluminescence. Applied Spectroscopy. 68(6):642-648. https://doi.org/10.1366/13-07330S642648686Tomizawa, M., & Casida, J. E. (2005). 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On-Line Monitoring Imidacloprid and Thiacloprid in Celery Juice Using Quartz Crystal Microbalance. Analytical Chemistry, 81(2), 527-532. doi:10.1021/ac801786aGámiz-Gracia, L., Garcı́a-Campaña, A. M., Soto-Chinchilla, J. J., Huertas-Pérez, J. F., & González-Casado, A. (2005). Analysis of pesticides by chemiluminescence detection in the liquid phase. TrAC Trends in Analytical Chemistry, 24(11), 927-942. doi:10.1016/j.trac.2005.05.009Roda, A., & Guardigli, M. (2011). Analytical chemiluminescence and bioluminescence: latest achievements and new horizons. Analytical and Bioanalytical Chemistry, 402(1), 69-76. doi:10.1007/s00216-011-5455-8Du, J., & Li, H. (2010). Sensitive Chemiluminescence Determination of Thirteen Cephalosporin Antibiotics with Luminol—Copper(II) Reaction. Applied Spectroscopy, 64(10), 1154-1159. doi:10.1366/000370210792973613Li, Y., Li, Y., & Yang, Y. (2011). Flow-Injection Chemiluminescence Determination of Lisinopril Using Luminol–KMnO4 Reaction Catalyzed by Silver Nanoparticles. Applied Spectroscopy, 65(4), 376-381. doi:10.1366/10-06115Catalá-Icardo, M., López-Paz, J. L., Choves-Barón, C., & Peña-Bádena, A. (2012). Native vs photoinduced chemiluminescence in dimethoate determination. Analytica Chimica Acta, 710, 81-87. doi:10.1016/j.aca.2011.10.043Mestre, Y. F., Zamora, L. L., & Calatayud, J. M. (2001). Flow-chemiluminescence: a growing modality of pharmaceutical analysis. Luminescence, 16(3), 213-235. doi:10.1002/bio.608Lara, F. J., García-Campaña, A. M., & Aaron, J.-J. (2010). Analytical applications of photoinduced chemiluminescence in flow systems—A review. Analytica Chimica Acta, 679(1-2), 17-30. doi:10.1016/j.aca.2010.09.001Icardo, M. C., & Calatayud, J. M. (2008). Photo-Induced Luminescence. 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Determination of nitrite and nitrate by reversed-phase high-performance liquid chromatography using on-line post-column photolysis with ultraviolet absorbance and electrochemical detection. Journal of Chromatography A, 452, 295-308. doi:10.1016/s0021-9673(01)81454-0Gómez-Benito, C., Meseguer-Lloret, S., & Torres-Cartas, S. (2013). Sensitive determination of Fenamiphos in water samples by flow injection photoinduced chemiluminescence. International Journal of Environmental Analytical Chemistry, 93(2), 152-165. doi:10.1080/03067319.2012.663755CATALÁ-ICARDO, M., LÓPEZ-PAZ, J. L., & PEÑA-BÁDENA, A. (2011). FI-photoinduced Chemiluminescence Method for Diuron Determination in Water Samples. Analytical Sciences, 27(3), 291. doi:10.2116/analsci.27.291Hamilton, D. J., Ambrus, Á., Dieterle, R. M., Felsot, A. S., Harris, C. A., Holland, P. T., … Wong, S.-S. (2003). Regulatory limits for pesticide residues in water (IUPAC Technical Report). 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Highly Sensitive SERS Detection of Neonicotinoid Pesticides. Complete Raman Spectral Assignment of Clothianidin and Imidacloprid
Corrosion properties of Ca-doped TiO2 coatings
The paper presents the preparation and characterization of TiO2 coating doped with Ca produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as calcium nitrate as dopant source. These coatings were used to modify the biomedical alloy M30NW. Using the optical microscopy and the atomic force microscopy the topography of synthesized coatings was characterized. Whereas using electrochemical methods the corrosion measurements were carried out. Anticorrosion properties of calcium-doped TiO2 coating were determined in PBS solution on the basis of corrosion potential Ecor, polarization resistance Rp, corrosion rate CR, current density in the passive range i0.5 and also breakdown Eb and repassivation Erep potentials. Analogous corrosion tests were also made for the uncoated alloy as well as for alloy coated with pure TiO2 coating. It was stated that modification of M30NW alloy surface by calcium-doped TiO2 coating shows anticorrosion properties in PBS solution. These properties are slightly lower compared to a pure TiO2 coating. The analysis of the topography of TiO2-based coatings showed that calcium doping increases the surface development and roughness of the obtained coatings
Paste electrode based on the thermally reduced graphene oxide in ambient air – Its characterization and analytical application for analysis of 4–chloro–3,5–dimethylphenol
Synthesis and characterization of the thermally reduced graphene oxide in argon atmosphere, and its application to construct graphene paste electrode as a naptalam electrochemical sensor
New insight into the preparation of sensitive carbon–based electrochemical electrode is provided by examining the properties of thermally reduced graphene oxide (TRGO). In this paper, TRGO was prepared by thermal reduction of graphene oxide (GO) in argon atmosphere, and characterized by Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and atomic force microscopy (AFM). Results showed that thermal reduction in argon was effective to remove oxygen-containing functional groups in GO, and graphene sheets were obtained. Furthermore, TRGO was used to prepare thermally reduced graphene oxide paste electrode (TRGOPE) which showed excellent conductivity and fast electron transfer kinetics confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrode was applied to determination of the pesticide naptalam (Nap) in square–wave voltammetric (SWV) mode. The corresponding current at approx. +1.0 V increased linearly with the Nap concentration within two linear dynamic ranges (LDR) of 0.1–1.0 μmol L−1 (LDR1) and 1.0–10.0 μmol L−1 (LDR2). The limits of detection (LOD) and quantification (LOQ) for Nap were calculated as 0.015 μmol L−1 and 0.051 μmol L−1, respectively. In comparison to the carbon paste electrode (CPE) the results showed that the TRGOPE possesses advantages in terms of linearity, sensitivity and detectability. © 2018 Elsevier B.V
β-Cyclodextrin and multiwalled carbon nanotubes modified boron-doped diamond electrode for voltammetric assay of carbendazim and its corrosion inhibition behavior on stainless steel
Advanced electrochemical platform for determination of cytostatic drug flutamide in various matrices using a boron-doped diamond electrode
An innovative, rapid and simple electrochemical approach for the reliable quantification of cytostatic drug flutamide (FLU) in various matrices is herein proposed. This platform involves coupling of differential pulse (DPV) and square-wave voltammetry (SWV) with a boron-doped diamond (BDD) electrode as the working electrode and 0.1 M sulphuric acid as the supporting electrolyte. For the first time, the voltammetric profile of FLU was manifested by three irreversible and diffusion-controlled oxidation peaks at + 1.1 (P1), + 1.4 (P2) and + 1.9 V (P3). The analytical performance evaluation was assessed for all three peaks, using both pulse voltammetric techniques with the optimized operating parameters and the highest sensitivity of 1.76 nA/mu M was accomplished for P2 using DPV and 3.54 nA/mu M for P3 using SWV. The corresponding linear concentration ranges were found to be 0.99-42.9 and 4.8-35.5 mu M with the detection limits of 0.42 and 0.18 mu M, respectively. The repeatability varied, depending on the oxidation peaks of FLU, with the relative standard deviations in the range of 3.3-8.8% and 2.9-9.3% for DPV and SWV, respectively. The proposed electrochemical platform was successfully applied in the analysis of pharmaceutical formulations, spiked human urine and water samples with the significant mean recoveries. Using BDD electrode, the current work establishes an advanced, simple and rapid alternative platform to so far used toxic mercury-based electrodes and time demanding chemically modified electrodes in cytostatic sensing. Besides, BDD electrode represents a comfortable electrochemical sensor for routine analysis in pharmaceutical, clinical and environmental chemistry. (C) 2017 Elsevier Ltd. All rights reserved.11th International Symposium on Electrochemical Micro and Nanosystem Technologies (EMNT), Aug 17-19, 2016, Royal Belgian Inst Nat Sci, Brussels, Belgiu