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ISE Nitrate Electrodes for continuous in-stream monitoring
Does anyone have any experience with the ISE nitrate electrodes for continuous monitoring directly in a stream? These appear to be the only “affordable” option for nitrate monitoring. The manufacturers’ literature seem to indicate that these may have a short lifetime before replacing the modules. However, there was a paper for work done in Portugal a few years ago in which an electrode gave results comparable to the lab for the duration of the 40 day test. With periodic (frequent?) calibration via comparison to lab results for testing of stream samples, could these give useful data?