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. 2021 Nov 12;21(22):7525. doi: 10.3390/s21227525

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Estimated spectra without the influence of NO_x⁻ absorbances for the six samples for a period of eight weeks: (a) TB-WTP unprocessed sample; (b) TB-WTP 0.22 μm filtered sample; (c) TB-WTP enhanced sample; (d) Meningie unprocessed sample; (e) Meningie 0.22 μm filtered sample; and (f) Meningie enhanced sample. Spectral change is assumed to be caused by monochloramine decay only. Compared to Figure 5, the subsequent spectra in all samples in Figure 6 do not cross the baseline, as no NO_x⁻ absorbances are considered.