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In humic, mesotrophic and eutrophic lakes (Masurian Lakeland, Poland) 100-200 samples of water were taken with the Larsson' plate from 0.5 mm surface microlayer (SM) and compared with the subsurface water (SSW). The concentrations of dissolved (in filtered water) and total (unfiltered) Kjeldahl nitrogen (organic and ammonium) (DKN, TKN) and phosphorus (DP,TP) were measured and the concentration of...
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