Xylem EXO Series User Manual page 20

affected by the UV absorbance of the DOM in the water. Testing shows that underlinearity can occur at fDOM
concentrations as low as 50 QSU. This factor means that a field sample with an fDOM reading of 140 QSU will
contain significantly more than double the fDOM of a sample that reads 70 QSU. This effect—good linearity
in colorless quinine sulfate solution, but underlinearity in stained field samples—is also exhibited by other
commercially available fDOM sensors and thus the performance of the EXO sensor is likely to be equivalent
or better than the competition while providing the advantages of easy integration into a multiparameter
package and automatic mechanical cleaning when used in monitoring studies with an EXO2 sonde.
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