scholarly journals Voltammetric Determination of Aclonifen at a Silver Amalgam Electrode in Drinking and River Water

2017 ◽  
Vol 24 (2) ◽  
pp. 277-284
Author(s):  
Vít Novotný ◽  
Jiří Barek
Keyword(s):  
River Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Tap Water ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Fast Determination ◽  
Silver Solid Amalgam Electrode ◽  
Amalgam Electrode

AbstractA method for the determination of pesticide Aclonifen (AC) in drinking and river water by differential pulse voltammetry (DPV) on a meniscus modified silver solid amalgam electrode (m-AgSAE) using solid phase extraction (SPE) as a cleanup and preconcentration procedure is described. The limit of detection (LOD) for direct DPV determination of AC in deionized water is 2.7·10-8mol·dm-3. LOD for DPV determination of AC in tap water after SPE is 1.6·10-10mol·dm-3, the recovery being 55%. LOD for the determination of AC in Vltava river water is 1.9·10-9mol·dm-3, the recovery being 65%. Humic acids interfere with the determination in river water; this problem can be resolved by adjusting the pH of the extracted sample to 6. The advantages of this approach are high sensitivity, low LOD, quick and easy sample preparation and fast determination.

Molecularly imprinted polymers for the selective determination of trace bisphenol A in river water by electrochemiluminescence

2013 ◽  
Vol 91 (8) ◽  
pp. 656-661 ◽  
Author(s):  
Xiaohua Jiang ◽  
Wengjie Ding ◽  
Chonglin Luan
Keyword(s):  
Bisphenol A ◽  
River Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
High Sensitivity ◽  
Selective Extraction ◽  
Molecularly Imprinted ◽  
Selective Determination ◽  
Extraction And Purification

The detection of bisphenol A (BPA) is very important for public health and environmental monitoring. In this work, BPA was found to be able to significantly quench the electrochemiluminescence (ECL) of the Ru(bpy)32+/2-(dibutylamino)ethanol (DBAE) system. Molecularly imprinted polymer was synthesized as solid-phase extraction sorbents, which were used for the selective extraction and purification of BPA. Under optimal conditions, the inhibited ECL intensity versus the logarithm of the concentration of BPA was in good linear relationship over a concentration range from 2.2 × 10−10 to 1.1 × 10−7 mol/L. The limit of detection was 4.5 × 10−11 mol/L (S/N = 3). The developed method was successfully applied for determination of BPA in river water with high sensitivity and reliability. Further, a possible mechanism for the quenching effects of the Ru(bpy)32+/DBAE system by BPA was also proposed.

Polarographic and Voltammetric Determination of Trace Amounts of 3-Nitrofluoranthene

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1571-1587 ◽  
Author(s):  
Karel Čížek ◽  
Jiří Barek ◽  
Jiří Zima
Keyword(s):  
River Water ◽  
Solid Phase ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode ◽  
Separation And Preconcentration

The polarographic behavior of 3-nitrofluoranthene was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a dropping mercury electrode, differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV), both at a hanging mercury drop electrode. Optimum conditions have been found for its determination by the given methods in the concentration ranges of 1 × 10-6-1 × 10-4 mol l-1 (DCTP), 1 × 10-7-1 × 10-4 mol l-1 (DPP), 1 × 10-8-1 × 10-6 mol l-1 (DPV) and 1 × 10-9-1 × 10-7 mol l-1 (AdSV), respectively. Practical applicability of these techniques was demonstrated on the determination of 3-nitrofluoranthene in drinking and river water after its preliminary separation and preconcentration using liquid-liquid and solid phase extraction with the limits of determination 4 × 10-10 mol l-1 (drinking water) and 2 × 10-9 mol l-1 (river water).

Voltammetric determination of the herbicide Bifenox in drinking and river water using a silver solid amalgam electrode

2009 ◽  
Vol 9 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Jiří Barek ◽  
Dana Cabalková ◽  
Jan Fischer ◽  
Tomáš Navrátil ◽  
Karolina Pecková ◽  
...  
Keyword(s):  
River Water ◽  
Voltammetric Determination ◽  
Silver Solid Amalgam Electrode ◽  
Amalgam Electrode

Voltammetric determination of 6-nitrobenzimidazole in the presence of surfactants

2011 ◽  
Vol 76 (11) ◽  
pp. 1317-1325 ◽  
Author(s):  
Dana Deýlová ◽  
Jiří Barek ◽  
Vlastimil Vyskočil
Keyword(s):  
Differential Pulse Voltammetry ◽  
Cetyltrimethylammonium Bromide ◽  
Sodium Dodecyl ◽  
Differential Pulse ◽  
Hanging Mercury Drop Electrode ◽  
Silver Solid Amalgam Electrode ◽  
Amalgam Electrode ◽  
Pulse Voltammetry ◽  
Triton X

Determination of 6-nitrobenzimidazole by differential pulse voltammetry at a hanging mercury drop electrode, a polished silver solid amalgam electrode and a mercury meniscus modified silver solid amalgam electrode was studied in the presence of the surfactants Triton X-100, cetyltrimethylammonium bromide and sodium dodecyl sulfate. It was found that only cetyltrimethylammonium bromide at polished silver solid amalgam electrode increases the voltammetric signal. This fact was used for the determination of 6-nitrobenzimidazole in the concentration range from 1 × 10–7 to 1 × 10–4 mol l–1 by differential pulse voltammetry at polished silver solid amalgam electrode in the presence of cetyltrimethylammonium bromide (concentration 1 × 10–4 mol l–1).

scholarly journals Low Cost, Easy to Prepare and Disposable Electrochemical Molecularly Imprinted Sensor for Diclofenac Detection

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 1975
Author(s):  
Isabel Seguro ◽  
João G. Pacheco ◽  
Cristina Delerue-Matos
Keyword(s):  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Tap Water ◽  
Low Cost ◽  
Differential Pulse ◽  
Portable Devices ◽  
Molecularly Imprinted ◽  
Selective Determination ◽  
Mip Sensor

In this work, a disposable electrochemical (voltammetric) molecularly imprinted polymer (MIP) sensor for the selective determination of diclofenac (DCF) was constructed. The proposed MIP-sensor permits fast (30 min) analysis, is cheap, easy to prepare and has the potential to be integrated with portable devices. Due to its simplicity and efficiency, surface imprinting by electropolymerization was used to prepare a MIP on a screen-printed carbon electrode (SPCE). MIP preparation was achieved by cyclic voltammetry (CV), using dopamine (DA) as a monomer in the presence of DCF. The differential pulse voltammetry (DPV) detection of DCF at MIP/SPCE and non-imprinted control sensors (NIP) showed an imprinting factor of 2.5. Several experimental preparation parameters were studied and optimized. CV and electrochemical impedance spectroscopy (EIS) experiments were performed to evaluate the electrode surface modifications. The MIP sensor showed adequate selectivity (in comparison with other drug molecules), intra-day repeatability of 7.5%, inter-day repeatability of 11.5%, a linear range between 0.1 and 10 μM (r2 = 0.9963) and a limit of detection (LOD) and quantification (LOQ) of 70 and 200 nM, respectively. Its applicability was successfully demonstrated by the determination of DCF in spiked water samples (river and tap water).

scholarly journals Determination of the fenvalerate insecticide in natural waters by a photochemically-induced fluorescence method

2015 ◽  
Vol 34 (2) ◽  
pp. 245 ◽  
Author(s):  
Diène Diégane Thiaré ◽  
Atanasse Coly ◽  
Diégane Sarr ◽  
Abdourakhmane Khonté ◽  
Amadou Diop ◽  
...  
Keyword(s):  
Natural Waters ◽  
Sea Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Irradiation Time ◽  
Tap Water ◽  
Analytical Sensitivity ◽  
Photochemically Induced Fluorescence ◽  
Relative Standard

<p>The fenvalerate pyrethroid insecticide was determined in various types of natural waters of Senegal by means of a newly-developed, simple, rapid and very sensitive photochemically-induced fluorescence (PIF) method. The PIF method was optimized with respect to the irradiation time, solvent and pH. The obtained calibration curves yielded correlation coefficients very close to unity. The limit of detection (LOD) and of quantification (LOQ) values were very low (LOD = 0.01–0.66 ng/ml and LOQ = 0.04–2.20 ng/ml, according to the solvent), and the relative standard deviation (RSD) values were small, ranging between 0.1 and 1.5 %, which indicated a very good analytical sensitivity and a great repeatability of PIF. Recovery studies were performed on spiked distilled water, tap water, sea water, well water, river water and draining water samples of Senegal, using the liquid-liquid extraction (LLE), solid phase extraction (SPE), and standard addition procedures. Satisfactory recovery results (about 85–121%) were obtained for the determination of fenvalerate in an aquatic environment.</p>

Voltammetric determination of Nordiazepam at meniscus modified silver solid amalgam electrode

2014 ◽  
Vol 7 (2) ◽  
pp. 105-108 ◽  
Author(s):  
Petr Samiec ◽  
Zuzana Navrátilová
Keyword(s):  
Ph Value ◽  
Ph Effect ◽  
Differential Pulse ◽  
Current Response ◽  
Limit Of Quantification ◽  
Silver Solid Amalgam Electrode ◽  
Amalgam Electrode ◽  
Optimum Ph ◽  
Pulse Voltammetry

Abstract New electrochemical method for determination of Nordiazepam (NDZ) at meniscus modified silver solid amalgam electrode (m-AgSAE) was developed utilizing differential pulse voltammetry (DPV). The pH effect on the current response of NDZ was studied in the mixture of Britton-Robinson buffer (BR) and methanol (9:1) with optimum pH value of 10. The calibration dependences were examined under the optimal conditions and linearity in the range from 2 × 10−6 to 1 × 10−4 mol L−1 with limit of quantification of 1.7 × 10−6 mol L−1 were accomplished.

scholarly journals Determination of Phenol in Tap Water and River Water Samples by Solid-Phase Spectrophotometry

2000 ◽  
Vol 16 (3) ◽  
pp. 269-273 ◽  
Author(s):  
Isoshi NUKATSUKA ◽  
Sachiko NAKAMURA ◽  
Kaori WATANABE ◽  
Kunio OHZEKI
Keyword(s):  
River Water ◽  
Water Samples ◽  
Solid Phase ◽  
Tap Water ◽  
River Water Samples ◽  
Solid Phase Spectrophotometry

scholarly journals Simultaneous electrochemical sensing of dihydroxy benzene isomers at cost-effective allura red polymeric film modified glassy carbon electrode

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Pattan-Siddappa Ganesh ◽  
Ganesh Shimoga ◽  
Seok-Han Lee ◽  
Sang-Youn Kim ◽  
Eno E. Ebenso
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Tap Water ◽  
Differential Pulse ◽  
Oxidation Potential ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Allura Red

Abstract Background A simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection of dihydroxy benzene isomers. Methods The modified working electrode was characterized by electrochemical and field emission scanning electron microscopy methods. The modified electrode showed excellent electrocatalytic activity for the electrooxidation of catechol (CC) and hydroquinone (HQ) at physiological pH of 7.4 by cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques. Results The effective split in the overlapped oxidation signal of CC and HQ was achieved in a binary mixture with peak to peak separation of 0.102 V and 0.103 V by CV and DPV techniques. The electrode kinetics was found to be adsorption-controlled. The oxidation potential directly depends on the pH of the buffer solution, and it witnessed the transfer of equal number of protons and electrons in the redox phenomenon. Conclusions The limit of detection (LOD) for CC and HQ was calculated to be 0.126 μM and 0.132 μM in the linear range of 0 to 80.0 μM and 0 to 110.0 μM, respectively, by ultra-sensitive DPV technique. The practical applicability of the proposed sensor was evaluated for tap water sample analysis, and good recovery rates were observed. Graphical abstract Electrocatalytic interaction of ALR/GCE with dihydroxy benzene isomers.

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