Flow-through electrochemical system

Details Flow-through electrochemical system Flow-through electrochemical system

G - Physics

01

N

324/23

G01N 27/30 (2006.01) G01N 27/28 (2006.01) G01N 27/40 (2006.01)

Patent

CA 1126337

ABSTRACT OF THE DISCLOSURE An electrochemical system using a flow-through electrode design employing a dual separation method to lower electrode poisoning due to large chemical species and interference current due to small electroactive species is disclosed. The system includes a fluid inlet to a reaction chamber and a fluid outlet from the chamber, with the chamber in contact with an electrode system. The electrode is protected from poisoning and inter- ference by a membrane system comprising a semipermeable membrane having well defined pore ranges therethrough which allow diffusion of only selected size small molecules. A unique sample stream flow control coupled with the size selective membrane combine to remove large, or macromolecule poisoning species and substantially reduce small species interference at the active surfaces of the electrode. For example, hydrogen peroxide, as an indicator for an enzyme substrate reaction, can be determined substantially free of interferences from high molecular weight species like proteins and low molecular weight species like ascorbic acid.

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