초록 ▼

An amperometric analysis system and method includes a flow tube constituting the amperometric cell in which magnetic flow metering electrodes function also as the counter and test electrodes for amperometric measurement. By combining the magnetic flow measurement with the amperometric measurement, a

An amperometric analysis system and method includes a flow tube constituting the amperometric cell in which magnetic flow metering electrodes function also as the counter and test electrodes for amperometric measurement. By combining the magnetic flow measurement with the amperometric measurement, additional electrodes are not needed to obtain the flow signal for compensating the amperometric measurement. Ultrasonic drivers are mounted on the end of the shank of the counter and test electrodes and driven by an ultrasonic oscillator to activate the electrodes to keep them clean. Complementary cleaning can be obtained through the simultaneous application of an electrochemical anodic pulse. The system includes a three-electrode circuit potentiostat in which the potential of the test electrode is fixed versus a reference electrode and the current flows between the test electrode and the counter electrode. An isolated current source allows the magnetic flow metering electrodes to serve simultaneously as test and counter electrodes in the amperometric circuit. The flow tube also includes a thermistor temperature compensator. Reliable direct amperometric analysis of a flowing stream is made possible by the invention.

대표청구항 ▼

A system for flow compensated amperometric analysis of a flowing stream comprising: conduit means for enabling flow of the stream therethrough; electrode means to contact the stream flowing through said conduit means; said electrode means comprising means capable of serving as magnetic flow meter el

A system for flow compensated amperometric analysis of a flowing stream comprising: conduit means for enabling flow of the stream therethrough; electrode means to contact the stream flowing through said conduit means; said electrode means comprising means capable of serving as magnetic flow meter electrodes and as test and counter electrodes of an amperometric analysis system; a reference electrode positioned to contact the stream for printing a potentiostat with said electrode means serving as counter and test electrodes for amperometric measurement of the stream; means coupled to said electrodes to produce an amperometric measurement signal representing the current flow through said test electrode required to produce a predetermined potential difference between said reference and test electrodes; means coupled to said electrode means to develop magnetic flow metering signal representing the flow rate of said stream; And means for combining said magnetic flow metering signal with said amperometric measurement signal to obtain an amperometric analysis of the stream that is flow compensated. A method for directly analyzing the concentration of unknown chemical species of a flowing stream by amperometric measurement comprising the steps of: flowing the stream through an amperometric cell containing electrode means comprising a test and a counter electrode and a reference electrode, said reference electrode having a potential relative to the test electrode; causing a current to flow between the test electrode and the counter electrode; developing an output signal related to said current to provide an amperometric measurement of the stream; applying a magnetic field to the flowing stream to develop from said electrode means a potential output signal related to stream flow rate through the cell; and combining the flow rate output signal and the amperometric output signal to obtain a final amperometric output signal relating to concentration of unknown chemical species in the stream that is flow compensated.