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000877708 1001_ $$0P:(DE-Juel1)156558$$aGottselig, N.$$b0$$eCorresponding author
000877708 245__ $$aGroundwater controls on colloidal transport in forest stream waters
000877708 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2020
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000877708 520__ $$aBiogeochemical changes of whole catchments may, at least in part, be deduced from changes in streamwater composition. We hypothesized that there are seasonal variations of natural nanoparticles (NNP; 1–100 nm) and fine colloids (<300 nm) in stream water, which differ in origin depending on catchmentinflow parameters. To test this hypothesis, we assessed the annual dynamics of the elemental compositionof NNP and fine colloids in multiple water compartments, namely in stream water, above and belowcanopy precipitation, groundwater and lateral subsurface flow from the Conventwald catchment,Germany. In doing so, we monitored meteorological and hydrological parameters, total element loads,and analyzed element concentrations of org C, Al, Si, P, Ca, Mn and Fe by Asymmetric Flow Field FlowFractionation (AF4). The results showed that colloid element concentrations were < 5 mmol/L. Up to anaverage of 55% (Fe) of total element concentrations were not truly dissolved but bound to NNP and finecolloids. The colloid patterns showed seasonal variability with highest loads in winter. The presence ofgroundwater-derived colloidal Ca in stream water showed that groundwater mainly fed the streamsthroughout the whole year. Overall, the results showed that different water compartments vary in theNNP and fine colloidal composition making them a suitable tool to identify the streams NNP and fine colloidsources. Given the completeness of the dataset with respect to NNP and fine colloids in multiplewater compartments of a single forest watershed this study adds to the hitherto underexplored role ofNNP and fine colloids in natural forest watersheds.
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000877708 7001_ $$0P:(DE-HGF)0$$aSohrt, J.$$b1
000877708 7001_ $$0P:(DE-Juel1)177770$$aUhlig, D.$$b2$$ufzj
000877708 7001_ $$0P:(DE-Juel1)157638$$aNischwitz, V.$$b3$$ufzj
000877708 7001_ $$0P:(DE-HGF)0$$aWeiler, M.$$b4
000877708 7001_ $$0P:(DE-Juel1)129427$$aAmelung, W.$$b5$$ufzj
000877708 773__ $$0PERI:(DE-600)1498726-0$$a10.1016/j.scitotenv.2019.134638$$gVol. 717, p. 134638 -$$p134638$$tThe science of the total environment$$v717$$x0048-9697$$y2020
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