Nitrogen and phosphorus concentrations in Lake Sevan in July of 2018 (preliminary research outputs)

23-07-2018

Compared to the same period last year, the concentrations of phosphate and ammonium ions in Lake Sevan were measured higher in spring of 2018, and the sharp rise in temperature created favorable conditions for the intensive flourishing of the lake.

The average value of the phosphate ion concentration in the surface and middle layers was estimated 0.08 mg /L and 0.15 mg /L- in the bottom layer, which do not exceed the defined norms (0.3 mg/L) of the GoA /27.01.2011/ N75-N decree. The average concentration of ammonium ion in the surface layer is 0.25 mg /L and 0.17 mg /L - in the bottom layer, which does not exceed the defined norms (0.5 mg /L).
The average value of the nitrate ion concentration in the surface layer was assessed 0.19 mg /L, and 0.12 mg /L- in the bottom layer. Measured concentrations do not exceed the defined norms (11 mg /L).
There will be accomplished an in-depth study of the lake ecosystem in various sections and depths along with the Institute of Hydroecology and Ichthyology of the Scientific Center of Zoology and Hydroecology of NAS RA during the expedition, July 30-31. 
 

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