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Manganese fractions in water of the polyhumic Siemianowka Dam Reservoir

100%

Cudowski A. , Gorniak A.

2008

tom 17

nr 5

713-719

Hydrochemical studies were performed from May to December 2004 at four stations in the polymictic, polyhumic Siemianówka Dam Reservoir (SDR) located on the upper Narew River in northeastern Poland. The total manganese (TMn) concentrations in the reservoir waters varied from 118 μg/dm3 to 638 μg/dm3 , and their increased values are caused by forming complexes with organic matter present in waters flowing from wetlands and forests. Until the moment when the maximum manganese concentration occurred in the reservoir, its upper part was characterized by the higher manganese concentration than the lower part. A long retention time of water delays the occurrence of total manganese maximum in the lower part in SDR. Maximal TMn concentrations were noted in the lower part of the reservoir in the end of summer, while minimal for the upper part in winter. The organic dissolved manganese fractions (ODMn), were the largest part of TMn, slightly less was the particular manganese (PMn) fraction, and the smallest part constituted the reactive dissolved manganese fraction (RDMn). Low concentrations of reactive manganese in winter are due to a low pH value and low concentrations of dissolved organic matter (DOC). Manganese sorption on colloids increases in summer and is accompanied by a pH increase during an intensive photosynthesis of algae and cyanoprocaryota.

Bottom malacofauna of the reservoir Siemianowka on the upper Narew River

84%

Jurkiewicz-Karnkowska E.

nr 1-4

Daily dynamics of water chemistry in a lowland polyhumic dam reservoir

67%

Jekatierynczuk-Rudczyk E. , Gorniak A. , Zielinski P. , Dziemian J.

2002

tom 11

nr 5

The daily dynamics of water chemistry were investigated in the polymictic and polyhumic Siemianówka Dam Reservoir (SDR), in NE Poland. The highest concentration of ammonia, nitrate and orthophosphate ions during the day and the highest values of conductivity at night were recorded. A maximum of dissolved organic carbon was noted during afternoon hours while the content of aromatic DOM compounds was smaller during the day than at night. Significant differences in water chemistry were noted between the morning, afternoon and night hours, especially in the spring season, this being affected by the activity of phytoplankton in the water of the eutrophic reservoir.