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The already existing filtration oft he wastewater treatment plant for the ammonium analyser was used and the OPUS UV probe was installed in the bypass by means of a flow cell. The optical measurement in the clear medium allowed the path length of the sensor to be increased from 1 to 2 mm, thus achieving more accurate measurement results.
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Furthermore, averaging was not necessary, since the individual measurements were stable after filtration. The set measuring interval was 2 min. The dynamics of the fast processes were thus reflected without damping.
The OPUS UV probe was equipped with a nitrate/nitrite calibration, so that the nitrogen balance of the measuring point could be recorded correctly.
The results showed that a spectral probe must necessarily be used at this measuring point, which can detect nitrate and nitrite in a differentiated manner. Besides nitrate, nitrite is always present in non-negligible concentrations, which interferes with an NOx measurement and produces deviating measurement results.
The optical properties of nitrate and nitrite are similar. They absorb UV light of almost the same energy or wavelength. If the UV measurement is carried out at only one wavelength, as is the case with optical NOx sensors, it is not possible to differentiate between these two parameters. The result is output as a pure nitrate value and differs significantly from the real concentrations in the presence of nitrite. Only with a spectral evaluation over a larger wavelength range with sufficient resolution, as is the case with the OPUS UV probe, can these two parameters be determined simultaneously and accurately.
The installation of the probe in the bypass is of great advantage at this point. In a clear medium, measured values can in principle be determined more stably and precisely. Damping is also not necessary. Fast processes can be reproduced realistically.
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You can read the detailed report including all test results here: