TY  - JOUR
AU  - Gottselig, N.
AU  - Sohrt, J.
AU  - Uhlig, D.
AU  - Nischwitz, V.
AU  - Weiler, M.
AU  - Amelung, W.
TI  - Groundwater controls on colloidal transport in forest stream waters
JO  - The science of the total environment
VL  - 717
SN  - 0048-9697
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2020-02411
SP  - 134638
PY  - 2020
AB  - Biogeochemical changes of whole catchments may, at least in part, be deduced from changes in streamwater composition. We hypothesized that there are seasonal variations of natural nanoparticles (NNP; 1–100 nm) and fine colloids (<300 nm) in stream water, which differ in origin depending on catchmentinflow parameters. To test this hypothesis, we assessed the annual dynamics of the elemental compositionof NNP and fine colloids in multiple water compartments, namely in stream water, above and belowcanopy precipitation, groundwater and lateral subsurface flow from the Conventwald catchment,Germany. In doing so, we monitored meteorological and hydrological parameters, total element loads,and analyzed element concentrations of org C, Al, Si, P, Ca, Mn and Fe by Asymmetric Flow Field FlowFractionation (AF4). The results showed that colloid element concentrations were < 5 mmol/L. Up to anaverage of 55% (Fe) of total element concentrations were not truly dissolved but bound to NNP and finecolloids. The colloid patterns showed seasonal variability with highest loads in winter. The presence ofgroundwater-derived colloidal Ca in stream water showed that groundwater mainly fed the streamsthroughout the whole year. Overall, the results showed that different water compartments vary in theNNP and fine colloidal composition making them a suitable tool to identify the streams NNP and fine colloidsources. Given the completeness of the dataset with respect to NNP and fine colloids in multiplewater compartments of a single forest watershed this study adds to the hitherto underexplored role ofNNP and fine colloids in natural forest watersheds.
LB  - PUB:(DE-HGF)16
C6  - pmid:31837854
UR  - <Go to ISI:>//WOS:000519994800060
DO  - DOI:10.1016/j.scitotenv.2019.134638
UR  - https://juser.fz-juelich.de/record/877708
ER  -