What is Causing This “Feature” in pH? The data above originate from a SeaFET pH sensor connected to a flow-through system that should provide stable, consistent data. As you can see, the Internal pH value experiences a dramatic drop in pH and a subsequent increase in noise midway through data collection. The External pH values match samples from a spectrophotometer. Temperature remains stable during the shift in Internal pH, indicating that the flow-through system continued to provide a consistent seawater supply.
Can you determine what caused the sudden change in Internal pH for this SeaFET?
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