In the Analysis of Carbon Dioxide by Ion-Selective Electrode Methodology

question 12

Multiple Choice

In the analysis of carbon dioxide by ion-selective electrode methodology, it is noticed that the instrument response time is longer for carbon dioxide than it is for pH, sodium, or potassium.Which of the following provides the correct explanation for this longer response?

• A)The increased response time is needed for the chemical reaction between carbon dioxide and the buffer surrounding the pH electrode.
• B)Electrode performance is being lost and requires replacement.
• C)The increased response time is needed to allow equilibration of carbon dioxide across the membrane.
• D)both a and c