Inline pH probe and offline desktop pH probe, calibrated with same buffers show different pH of a solution at the same time. What can be the reason?
Based on the limited description of the differences in the experimental conditions, I would assume that the inline measures pH of a solution without atmospheric contact, and the offline measures pH of a solution with atmospheric contact. So, it could be that exchange of gas (e.g., carbon dioxide) from the atmosphere into the solution could be causing the difference. Carbon dioxide is present in the air we breathe, and it can dissolve into solutions, which can alter the pH of the solution.
Dear Vishnu Kanth
Different pH and different reasons, such probes reaction for temperature , conductivity also ..Pls. find the attached files, specially the 1st one, may help in your studies.
http://www2.emersonprocess.com/siteadmincenter/PM%20Rosemount%20Analytical%20Documents/Liq_ADS_2834-03.pdf
https://www.seneye.com/media/documentation/User_Guide_UK.pdf
http://us.mt.com/us/en/home/products/Process-Analytics/pH-probe.html
http://www2.emersonprocess.com/siteadmincenter/PM%20Rosemount%20Analytical%20Documents/Liq_ADS_2834-03.pdf
Regards
Prof. Houda Kawas
Based on the limited description of the differences in the experimental conditions, I would assume that the inline measures pH of a solution without atmospheric contact, and the offline measures pH of a solution with atmospheric contact. So, it could be that exchange of gas (e.g., carbon dioxide) from the atmosphere into the solution could be causing the difference. Carbon dioxide is present in the air we breathe, and it can dissolve into solutions, which can alter the pH of the solution.
Hi Kenneth,
What if I measure pH of the same solution after calibrating with same buffer solution and the values differ?
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