The study presents differences in the elemental composition between the surface microlayer (SML) and the subsurface (SUB) water sampled from a low trophy lobelian lake in the course of 48-hour monitoring supplemented with chlorophyll-a and microalgae analyses. In this study, we examined daily dynamics of such elements as Ag, Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Na, Ni, Mg, Mn, Pb, Se, Sr, Zn and chlorophyll a content in the SML and SUB as well as the capacity for enrichment of these elements in the SML. Our analysis of metals by mass spectrometry showed that concentrations of the mentioned elements, including heavy metals, in the SML were statistically significantly higher than in the SUB. The amplitude of changes in the metal concentration dynamics observed in the SML for most of the investigated elements and chlorophyll a was greater than in the case of the SUB. A circadian dynamics, frequently cyclical in character, was found in both analysed layers. Based on cluster analysis, groups of chemical elements were selected, showing a similar circadian course of changes in the concentrations during the monitoring. Moreover, observations of the taxonomic composition of the phytoneuston and phytoplankton showed the occurrence of algal species characteristic of water bodies with low trophy levels. The results provide insight into the functioning of interrelationships between physical parameters such as salinity, temperature and biological chlorophyll and possible mechanisms causing the accumulation of such chemical components as metals, metaloids, in the SML of a lobelia lake.  

4.23.2018