Current, electrical reverse saturation

Fig. 9.3. Electrical characteristics of a palladium/a-Si H Schottky barrier (a) the exponential forward current, the ideality factor, n, the reverse current, and the effects of annealing, described in Section 9.1.3 (6) the temperature dependence of the saturation current density plotted according to Eq. (9.14) (Thompson et at. 1981).

In the most sensitive eiectroanaiytical methods, exclusively treated within this context, the analyte ion is electrodeposited on an electrode from an electrically conducting sample solution. Current and potential of subsequent redissolution are due to the concentration and the kind of ion to be determined. For thallium, the reversible redox couple TI /TI° at about -0.5 V versus saturated calomel electrode is used (Bellavance and Miller, 1975). Infinite tolerance towards alkali, alkaline earths and halogenides are great merits for the analysis of biological materials. Because of the preconcentration step included, thallium determination is more sensitive than atomic spectrometric methods. For thallium, the multielement capabilities of the method can hardly be used, because lead and frequently cadmium have to be masked with excess of complexants, leaving just Tl in the potential... 

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