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Propulsor pneumático versátil e isento de pulsação para sistemas de análise em fluxo

2001; Brazilian Chemical Society; Volume: 24; Issue: 6 Linguagem: Inglês

10.1590/s0100-40422001000600017

1678-7064

Renato Camargo Matos, Ivano Gebhardt Rolf Gutz, Lúcio Angnes, Rinaldo S. Fontenele, Jairo J. Pedrotti,

Biosensors and Analytical Detection

SYSTEMS.Aquarium air pumps are proposed and evaluated as pneumatic liquid propulsion devices for flow injection and continuos flow analysis (FIA and CFA) systems.This kind of pump is widely available at a very low cost and it can sustain a pressure around of 4 psi (0.28 bar) indefinitely.By applying this air pressure onto a solution contained in a reservoir flask, it is possible to reach flow rates of up to 12.5 mL min -1 for circuits comprising reactors, made from 0.8 i.d.tubing with a length of 100 cm.The precise adjustment of flow rate below the maximum one can be made with a simplified needle valve or inserting in series a short length of capillary tube.The absence of flow pulsation is a definite advantage in comparison with peristaltic pumps, especially when amperometric detection is elected, as confirmed experimentally in FIA and CF applications.