Effect on dissolved natural organic matter proxies by increased complexation with iron / Effekter av økte jernkonsentrasjoner på parametere som beskriver egenskapene til løst naturlig organisk materiale
Absorbency of UV and visible light by dissolved natural organic matter (DNOM) is used in proxies (sUVa, SAR) to assess its physiochemical characteristics and thereby removability of the DNOM by waterworks. The ongoing browning of surface waters is partly due to increased concentration and change in characteristics of DNOM. However, it is also likely that the browning is partly due to the increased iron complexation by DNOM. The significance of absorbency by the Fe-DNOM complex needs to be assessed in order to distinguish between the drivers of brownification.