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Modified electrode voltammetric sensors for trace metals in environmental samples
Brett,Christopher M.A.; Fungaro,Denise A.Nafion-modified mercury thin film electrodes have been investigated for the analysis of trace metals in environmental samples of waters and effluent by batch injection analysis with square wave anodic stripping voltammetry. The method, involving injection over the detector electrode of untreated samples of volume of the order of 50 microlitres has fast response, blocking and fouling of the electrode is minimum ...
Poly(ester sulphonic acid) coated mercury thin film electrodes: characterizatio...
Brett, Christopher M. A.; Fungaro, Denise A.Mercury-thin film electrodes coated with a thin film of poly(ester sulphonic acid) (PESA) have been investigated for application in the analysis of trace heavy metals by square wave anodic stripping voltammetry using the batch injection analysis (BIA) technique. Different polymer dispersion concentrations in water/acetone mixed solvent are investigated and are characterised by electrochemical impedance measurem...
Novel polymer-modified electrodes for batch injection sensors and application t...
Brett, Christopher M. A.; Fungaro, Denise A.; Morgado, José M.; Gil, M. HelenaVarious polymer coatings have been investigated for the protection of mercury thin-film electrodes in the square wave anodic stripping voltammetry of environmental samples using batch injection analysis, with injection of untreated samples of volume 50 [mu]l directly over the sensing electrode. Polymer coatings studied include those with controlled porosity, and cation-exchange polymers based on sulphonated pol...
Microelectrode arrays: application in batch-injection analysis
Fungaro, Denise A.; Brett, Christopher M. A.The application of microelectrode arrays in electrochemical batch-injection analysis, injection volumes<=100Â [mu]l, has been investigated using a random array of microdisks (RAM) electrode made with carbon fibres. Preliminary batch-injection experiments involving hexacyanoferrate(II) oxidation, using fixed-potential amperometry and cyclic voltammetry, showed the expected lesser dependence on injection flow rat...
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