Injetor multicanal com válvulas de estrangulamento para análise em fluxo

Química Nova

Fabiano S. Palgrossi²  Jairo J. Pedrotti¹  Ivano G. R. Gutz² 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP

关键词: injector;    commutator;    flow analysis;    pinch valve;   

DOI  :  10.1590/S0100-40422001000500017

来源: SciELO

【 摘 要 】

An important component for the automation of flow injection analysis (FIA) systems is the sample injection valve. A simple and inexpensive commutator with 16 pinch valves (8 normally open and 8 closed) was developed and configured as a multichannel injection valve. It is activated by a single solenoid of 3 Kgf, powered by a pulsed driver circuit, controlled by a microcomputer or a switch. FIA with spectrophometric detection of potassium dichromate solution was used for the evaluation of the new injection valve and its comparison with other valves, for sample loops of 50, 100, 200, 300 and 500 muL. The repeatability was favorable (RSD 1.0% for 15 injections at each loop volume) compared to a manual injector, an electropneumatic injector and an injector configured with three mini solenoid valves (RSD 1.1, 1.3 and 1.0%, respectively, for15 injections at each loop volume).

【 授权许可】

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