Formation tester comprising reactive filter material sensors

A method comprising:

• introducing a sensor into a flow line in a wellbore in a subterranean formation, the sensor comprising:
• at least one reactive material arranged in the flow line, wherein the at least one reactive filter material sorbs an analyte in a wellbore fluid in the flow line;
• and a first detector that detects a first sorption signal specific to the analyte at a first location upstream of the at least one reactive filter material and a second detector that detects a second sorption signal specific to the analyte at a second location downstream of the at least one reactive filter material;
• flowing the wellbore fluid through the flow line, wherein the wellbore fluid first contacts the first location and thereafter contacts the second location;
• and calculating a balanced measurement with the sensor corresponding to the presence of the analyte in the wellbore fluid;
• wherein the calculation of the balanced measurement is based on the first sorption signal and the second sorption signal.

A system comprising:

• a sensor placed in a wellbore extending in a subterranean formation, the sensor comprising:
• at least one reactive filter material in a flow line, wherein the at least one reactive filter material sorbs an analyte in a wellbore fluid in the flow line;
• and a first detector that detects a first sorption signal specific to the analyte at a first location upstream of the at least one reactive filter material and a second detector that detects a second sorption signal at a second location downstream of the at least one reactive filter material, wherein the sensor calculates a balanced measurement corresponding to the presence of the analyte in the wellbore fluid;
• wherein the calculation of the balanced measurement is based on the first sorption signal and the second sorption signal.