Trace elements voltammetry

Table 8.76 shows the main characteristics of voltammetry. Trace-element analysis by electrochemical methods is attractive due to the low limits of detection that can be achieved at relatively low cost. The advantage of using standard addition as a means of calibration and quantification is that matrix effects in the sample are taken into consideration. Analytical responses in voltammetry sometimes lack the predictability of techniques such as optical spectrometry, mostly because interactions at electrode/solution interfaces can be extremely complex. The role of the electrolyte and additional solutions in voltammetry are crucial. Many determinations are pH dependent, and the electrolyte can increase both the conductivity and selectivity of the solution. Voltammetry offers some advantages over atomic absorption. It allows the determination of an element under different oxidation states (e.g. Fe2+/Fe3+). 

Energy Dispersive X-ray Fluorescence Analysis Preconcentration of Trace Elements Radionuclide X-ray Fluorecence Analysis Voltammetry... 

Stan Van Den Berg is a Professor of Chemical Oceanography at the University of Liverpool. His research interests focus on the chemical specia-tion of trace elements and organic compounds in natural waters and the redox chemistry of metals and sulfides. His research group has pioneered advances in analytical techniques using electroanalytical methods (cathodic stripping voltammetry and chronopotentiometry). Dr. Van Den Berg is a broad-based analytical chemist. 

Florence, T.M. (1992) Trace element speciation by anodic stripping voltammetry. Analyst, 117, 551-553. 

Electrochemical techniques anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) for determining trace elements, and potentiometric sensors for determining dissolved gases (C02, N02, S02, NH3, H2S, HCN, and HF) as well as chloride, fluoride, cyanide, and sulfide. 

Mader, P., Szakova, J., Curdova, E. Combination of classical dry ashing with stripping voltammetry in trace element analysis of biological materials review of literature published after 1978. Talanta 43, 521-534 (1996)... 

Wang J (1994) Voltammetry. In Herber RFM and Stoeppler M. Trace Element Analysis in Biological Specimens, pp. 129-145. Elsevier Amster-dam-London-New York-Tokyo. 

Table II.7.7 Ligands used to determine trace elements by adsorptive stripping voltammetry [68]...

Van den Berg CMG (1989) Adsorptive cathodic stripping voltammetry of trace elements in sea water. The Analyst 114 1527-1530. 

Daih, B.J. Huang, H.J. Determination of trace elements in sea water by flow-injection anodic stripping voltammetry preceded by immobilized quinolin-8-ol silica gel preconcentration. Anal. Chim. Acta 1992, 258, 245. 

C. M. G. van den Berg Adsorptive Cathodic Stripping Voltammetry of Trace Elements in V falerC Analyst 114 (1989) 1527. 

M), which is suitable for monitoring ultralow levels of trace metals in natural water. Other advantages include multielements measurement, trace element speciation and distribution, and continuous in situ detection. The sensors for two voltammetric stripping techniques are discussed below anodic stripping voltammetry (ASC) and adsorptive cathodic stripping voltammetry (AdCSV). 

The detection of trace elements by anodic stripping voltammetry (ASV) is a well established electroanalytical technique, in which the accumulation of the metals at the electrode plays a major role in the improvement of detection limits [T3]. In... 

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