23 research outputs found
Modified carbon-containing electrodes in stripping voltammetry of metals. Part II. Composite and microelectrodes
Full text linkGold microelectrode ensembles: cheap, reusable and stable electrodes for the determination of arsenic (V) under aerobic conditions
No full textThe determination of total arsenic through As(V) anodic stripping voltammetry (ASV) is, in some cases, preferable over As(III) ASV. The As(V) ASV procedure has no chemical reduction step from As(V) into As(III), which results in decreased analysis time and no contamination from reducting reagents. A simple and reliable procedure of As(V) determination is proposed. Anodic stripping determination of trace As(V) at gold microelectrode ensembles in diluted HCl solution in the presence of dissolved oxygen is shown. The electrode is based on a carbon black (30%)-polyethylene composite. The sensor was prepared by gold electrodeposition on the surface of the composite electrode. The given sensor is cheap, reliable and stable, especially when electrochemical activation is employed. The experimental parameters for the electrochemical determination were optimized, namely 0.005M HCl as the background electrolyte, the deposition potential -2.2V (versus Ag/AgCl in 1M KCl) and 180mVs-1 linear scan rate. Calibration curves were obtained and were linear in [As(V)] over the 1.5-45 μgL-1 range, with a LOD of 0.5 μgL-1. The effect of common interfering species is studied. The electrochemical behaviour of As(III) form is studied in the same experimental conditions. It was found that As(III) is deposited at lower potentials (starting at -0.6 V) and the sensitivity of As(III) detection is higher, but dependant on the presence of dissolved oxygen. The speciation of inorganic forms of arsenic is discussed. © 2013 Taylor and Francis
Vaccinia virus recombinant expressing gene of tick-borne encephalitis virus non-structural NS1 protein elicits protective activity in mice.
No full textA vaccinia virus recombinant containing the non-structural tick-borne encephalitis virus (TBEV) NS1 gene was developed. The recombinant expressed native dimeric form of the NS1 protein in infected cells and protected mice against lethal infection with TBEV
Understanding heat and groundwater flow through continental flood basalt provinces: insights gained from alternative models of permeability/depth relationships for the Columbia Plateau, USA
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A tentative model for the explanation of Båth law using the order parameter of seismicity in natural time
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Microbiological and isotopic geochemical investigation of Lake Kislo-Sladkoe, a meromictic water body at the Kandalaksha Bay shore (White Sea)
No full textThe Methods for Determining the Level of the Import Influence on the Structure of the Foreign Trade Turnover in the North-Caucasian Regions
No full textEvaluation of MALDI-TOF/TOF Mass Spectrometry Approach for Quantitative Determination of Aspartate Residue Isomerization in the Amyloid-β Peptide
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