Peculiarities of Annual Variations in the Concentration of Iron Compounds in the Water_Bottom Sediments System of the Mozhaisk Reservoir

摘要

Annual variations in concentrations of Fe forms in the bottom water (0_70 cm from the bottom, by layers), pore water, and in solid phase of silts (25 cm, by layers) of the Krasnovidovo Pool channel area of the Mozhaisk Reservoir are studied. A drastic increase in the concentration and ratio of Fe susp /Fe dis in the water layer 0_20 cm from the bottom is detected. Fe(II) dominates in dissolved and suspended forms. The concentrations of Fe(III) reaching 2_3 mg/l were for the fist time revealed in the pore water of silts (Eh ~ _ 120 mV). The factors responsible for this phenomenon are discussed. Fe flux from sediments is tentatively assessed as 0.2_ 0.6 mg Fe m 2 /day.