Electrochemical measurement device
First Claim
1. An electrochemical measurement device comprising:
- a flow cell for electrochemical measurement of a sample solution, the flow cell including a flow channel, a working electrode and a counter electrode; and
a control device connected to the flow cell andconfigured to control the flow cell to perform the electrochemical measurement by repeatedly performing a cycle, including a conditioning step including applying a first voltage between the working electrode and the counter electrode, an electrochemical measurement step including applying a second voltage between the working electrode and the counter electrode to analyze the sample solution in the flow cell, and a cleaning step including applying a third voltage between the working electrode and the counter electrode, as a plurality of cycles,wherein the control device is further configured to;
measure, in the conditioning step, the electrochemical measurement step, or the cleaning step of a determination target cycle of the plurality of cycles, a current value of a current flowing between the working electrode and the counter electrode at the time of applying the first voltage, the second voltage, or the third voltage thereto;
record the measured current value;
compare the measured current value with a determination standard based on a current value obtained from the plurality of cycles which precede the determination target cycle including one of the plurality of cycles that occurred immediately before the determination target cycle; and
determine whether the measured current value is abnormal based on a result of the comparison; and
when the measured current value is abnormal, output an abnormality notification of the measured current value.
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Accused Products
Abstract
A flow cell for electrochemical measurement which introduces a sample solution, applies a voltage between a working electrode and a counter electrode to analyze the sample solution electrochemically, discharges the sample solution, and performs the electrochemical measurement continuously. The flow cell includes a unit which measures a value of a current flowing between electrodes at the time of applying a voltage, a unit which records the measured current value, a unit which compares the recorded current value with a current value set separately as a determination standard, and a unit which determines whether the current value measured at a cycle of a determination target and the recorded current value is normal by the comparison.
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Citations
9 Claims
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1. An electrochemical measurement device comprising:
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a flow cell for electrochemical measurement of a sample solution, the flow cell including a flow channel, a working electrode and a counter electrode; and a control device connected to the flow cell and configured to control the flow cell to perform the electrochemical measurement by repeatedly performing a cycle, including a conditioning step including applying a first voltage between the working electrode and the counter electrode, an electrochemical measurement step including applying a second voltage between the working electrode and the counter electrode to analyze the sample solution in the flow cell, and a cleaning step including applying a third voltage between the working electrode and the counter electrode, as a plurality of cycles, wherein the control device is further configured to; measure, in the conditioning step, the electrochemical measurement step, or the cleaning step of a determination target cycle of the plurality of cycles, a current value of a current flowing between the working electrode and the counter electrode at the time of applying the first voltage, the second voltage, or the third voltage thereto; record the measured current value; compare the measured current value with a determination standard based on a current value obtained from the plurality of cycles which precede the determination target cycle including one of the plurality of cycles that occurred immediately before the determination target cycle; and determine whether the measured current value is abnormal based on a result of the comparison; and when the measured current value is abnormal, output an abnormality notification of the measured current value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrochemical measurement system, comprising:
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an electrochemical measurement device; a display device which is located remote from the electrochemical measurement device; a control device which is located remote from the electrochemical measurement device and which is connected to the electrochemical measurement device and the display device, wherein the electrochemical measurement device includes a flow cell for electrochemical measurement of a sample solution, the flow cell including a flow channel, a working electrode and a counter electrode, wherein the control device is configured to control the flow cell to perform the electrochemical measurement by repeatedly performing a cycle, including a conditioning step including applying a first voltage between the working electrode and the counter electrode, an electrochemical measurement step including applying a second voltage between the working electrode and the counter electrode to analyze the sample solution in the flow cell, and a cleaning step including applying a third voltage between the working electrode and the counter electrode, as a plurality of cycles, wherein the control device is further configured to; measure, in the conditioning step, the electrochemical measurement step, or the cleaning step of a determination target cycle of the plurality of cycles, a current value of a current flowing between the working electrode and the counter electrode at the time of applying the first voltage, the second voltage, or the third voltage thereto; record the measured current value; compare the measured current value with a determination standard based on a current value obtained from the plurality of cycles which precede the determination target cycle including one of the plurality of cycles that occurred immediately before the determination target cycle; and determine whether the measured current value is abnormal based on a result of the comparison; and when the measured current value is abnormal, output an abnormality notification of the measured current value to the display device.
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9. A method of detecting an abnormality in an electrochemical measurement device having a flow cell for electrochemical measurement of a sample solution, the flow cell including a flow channel, a working electrode and a counter electrode, the method comprising:
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controlling the flow cell to perform the electrochemical measurement by repeatedly performing a cycle, including a conditioning step including applying a first voltage between the working electrode and the counter electrode, an electrochemical measurement step including applying a second voltage between the working electrode and the counter electrode to analyze the sample solution in the flow cell, and a cleaning step including applying a third voltage between the working electrode and the counter electrode, as a plurality of cycles; measuring, in the conditioning step, the electrochemical measurement step, or the cleaning step of a determination target cycle of the plurality of cycles, a current value of a current flowing between the working electrode and the counter electrode at the time of applying the first voltage, the second voltage, or the third voltage thereto; comparing the measured current value with a determination standard based on a current value obtained from the plurality of cycles which precede the determination target cycle including one of the plurality of cycles that occurred immediately before the determination target cycle; determining whether the measured current value is abnormal based on a result of the comparison; and when the measured current value is abnormal, outputting an abnormality notification of the measured current value.
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Specification