Hradovych N. Dynamics of Plumbum and Cadmium content in artificial hydroecosystems and the organism Hypophthalmichthys molitrix Valenciennes and methods of its correction.

The dissertation work for the first time the peculiarities of the accumulation of Plumbum and Cadmium in organs and tissues of the white silver carp were studied. It was studied that the presence of Cadmium increases (in the case of gills it is significant) that the cumulative effect of Plumbum in silver carp is studied; Cumulation of Cadmium in the presence of Plumbum can be both greater in separate organs (muscles) and smaller (kidneys) in comparison with accumulation in the absence of another metal. The peculiarities of the effect of liming on the content of Plumbum and Cadmium in the water of the fish pond have been specified, and its influence on the cumulation of these metals in phytoplankton and in the body of the white silver carp in the conditions of the pond has been developed. Measures are proposed to improve the condition of hydroecosystems of freshwater reservoirs, which includes the use of zeolite as a sorbent. The effectiveness of the claimed method and its advantages are confirmed by an example of a specific implementation of the method. When zeolite was introduced at a rate of 282 kg / ha, the Cadmium content in the water gradually decreased and remained low during the 2 months. The volume of the Plumbum in the water first decreased significantly, later grew to almost the previous level. The content of Cadmium and Plumbum in silver carp carcass in two months was significantly less than before the introduction of zeolite. Its dosage, orma, duration of exposure, temperature and pH influences on the sorbtion effectiveness of heavy metals by zeolite. Increasing the temperature and pH causes a decrease in the residual concentration of cadmium ions in the aqueous medium. The more complete absorption of ions in Plumbum occurs at elevated temperatures and a lowered hydrogen content of the aqueous medium. The effectiveness of the claimed method and its advantages are confirmed by 7 an example of a specific implementation of the method.