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Química Nova

versión impresa ISSN 0100-4042versión On-line ISSN 1678-7064


SANTOS, Wallans T. P. dos; CEOLIN, Marselha P.; ALBUQUERQUE, Yaico D. T. de  y  RICHTER, Eduardo M.. The use of pressure generated by a water column to control flow rates in flow analysis systems. Quím. Nova [online]. 2007, vol.30, n.7, pp.1754-1758. ISSN 0100-4042.

This work presents a new approach to control the flow rate in hydrodynamic flow experiments. The combination of air pressure generated by an aquarium air pump and the pressure generated by a water column were used for this purpose. This device supports a stable flow rate without pulsation for a long period of time. Furthermore, the flow rate can be easily controlled at various values in one or more streams. The performance of this approach was investigated using Fe(CN)64- solutions in flowing systems using amperometric and voltammetric detection in wall-jet configuration. The results showed that the performance of the proposed device was better than a commercial peristaltic pump. It suggests that this approach can be used successfully in flow analysis systems.

Palabras clave : flow rates control; water column; flow analysis.

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