Which of the following gases affect the accuracy of NO/NO2 electrochemical monitors? 1. NH2 2. N2O 3. CO2 4. Carbon monoxide (CO) 5. Nitrogen (N2)
a. 1, 4, and 5 c. 2, 3, and 5
b. 1, 3, and 4 d. 3 and 4
ANS: B
The accuracy of NO/NO2 electrochemical monitors can be altered by the presence of background gases—such as CO2, CO, and NH2—that have lower oxidation potentials than the sensor poten-tial.
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