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Simultaneous determination of multiple components in flow-injection systems by square-wave amperometry

✍ Scribed by T.P. Tougas; C.Y. Yuan

Book ID
104100271
Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
320 KB
Volume
192
Category
Article
ISSN
0003-2670

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✦ Synopsis

Two or more components can be determined in a single sample by using a flow-injection system with an electrochemical detector, a microprocessor-based potentiostat, and a microcomputer. The computer generates a repeating staircase potential program with a superimposed square wave. Square-wave amperometric measurements at each potential step are used to construct the current/time response at the potential. By appropriate selection of step potentials, the reconstructed response from each step corresponds to the flow-injection response of a particular component. The approach is evaluated by applying it to the simultaneous determination of copper, lead, cadmium and zinc. Limits of detection range from 8 to 18 I.cg 1-l. Sample throughput is 80 h-' .

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