The Dutch Environmental Research Institute (RIVM) evaluated the operation of various sensors for online measurement of nitrate in surface water in both lab and outdoor conditions.
The measurement campaign shows that if a UV sensor is properly calibrated, the measurement is more accurate than the laboratory measurement. Moreover, the continuous determination allows the change in nitrate concentration to be determined much better. This provides insight into the processes that lead to nitrate leaching and allows a more accurate average of the nitrate concentration to be determined.
The NICO UV sensor that RMA supplies participated in the study under the name OTT ECO-N.
Read the full article from Water Matters - Knowledge magazine for water professionals (in Dutch).