Some analytical studies on sensors and speciation

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This thesis is divided into two parts. Part A\ndescribes the development o f some biosensors based on\nthe immobilisation o f enzymes, tissue, microbes and\nplant materials in carbon paste. The performance\ncharacteristics o f these biocatalytic devices were\ninvestigated in both batch and flowing systems for the\ndetection o f neurotransmitters, mono-phenols and\nglucose using amperometry. A new immobilisation\nprocedure involving the use o f spectroscopic graphite\nand silicone grease is also described. Anodic\nStripping Voltammetry was employed to illustrate the\ndetection o f Pb(II) and Cu(II) at lichen-modified\ncarbon paste electrodes.\n\nContinuing the theme o f metal analysis in Part B,\ncomparison o f chromatographic and spectrometric\nmethods is described for the detection o f Fe(III) and\nAl(III) in soils and clays. Information regarding\nspeciation o f these metals within the matrices o f\nsoils and clays was obtained. Subsequently, a\nchromatographic method for the separat

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