Download Contemporary Electroanalytical Chemistry by Ari Ivaska (auth.), Ari Ivaska, Andrzej Lewenstam, Rolf Sara PDF

By Ari Ivaska (auth.), Ari Ivaska, Andrzej Lewenstam, Rolf Sara (eds.)

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3) forcing the S/H to the sample mode and enabling the first latch to follow the output of the autoranger. After the next time-out the cycle begins anew until a predetermined number of data points has been read. 4). VIA is programmed to a pulse output-mode, where writing of the lower bits of a potential causes VIA to generate a clock pulse for the latches, which transmit the potential to the D / A-converter. The output range of the converter-amplifier system can be manually selected. Discussion Our primary aim has been to construct a convenient electrochemical measuring system for the characterization of conducting polymers.

All these usually necessitate the use of a computer to control the measurement. The basic component of electrochemical instrumentation is the potentiostat. The use of a single computer or microprocessor to control voltammetric instrumentation is weil established and many digitally controlled potentinstat configurations have been described, 1 - 6 but the limited capabilities of microprocessors may render their use difficult and a minicomputer system is quite expensive for control purposes. On the other hand, the use of two computers, a microprocessor or a microcomputer for realtime control of the experiment and a hast computer for data evaluation, offers several advantages.

D. MacDonald, Comprehensive Treatise of Electrochemistry, Vol. 8, (1984) 1. R. E. L. Booman, Anal. , 40 (1968) 1411. D. Salt and D. Lunney, Anal. , 52 (1980) 2237. P. Jayaweera and L. Ramaley, Anal. , 15 (1986) 241; L. P. Surette, Chem. , 8 (1978) 181. K. Chandler and D. Pletcher, Spec. Period. Rep. , 10 (1985) 117. P. Marque, J. Roncali and F. Garnier, J. Electroanal. , 218 (1987) 107. J. Roncali and F. Garnier, Nouv. J. , 10 (1986) 237. M. M. Pernaut, Synth. , 10 (1984/85) 117. SMOOTHING OF AC POLAROGRAPHIC DATA BY FFT FILTERING Johan Bobacka and Ari lvaska Labaratory of AnaJyticaJ Chemistry Abo Akademi University SF-20500 Turku-Abo, Finland Introd uction In ac polarography the measured signal often contains random fluctuations, usually referred to as noise.

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