Khasanova R.F., Semenova I.N., Suyundukov Ya.T., Rafikova Yu.S., Biktimerova G.Y., Ilbulova G.R., Kuzhina G.Sh., Ilyina I.V.
ECOLOGICAL ESTIMATION OF POLLUTION BY HEAVY METALS OF SOILS OF INDUSTRIAL ZONES OF SIBAY CITY ^{[№ 12 ' 2017]}
The state of soils affects the environment and natural resources, the level of economic and social development and public health. In this paper, the content of heavy metals in the soils of the center of the mining industry of the Trans-Ural region of the Republic of Bashkortostan, Sibai, has been studied. Sibai soils contamination with heavy metals is associated with anthropogenic activity and differs in various degrees of concentration. In the soils, high concentrations of gross and mobile forms of Cu, Zn, Ni, Mn, Cd were detected. A number of accumulations of metals have been formed over the gross content: Zn < Cu < Co < Cd < Pb < Mn < Ni < Fe, from mobile forms: Cu < Zn < Mn < Cd < Ni < Co < Pb < Fe. According to the total pollution index, the ecological status of the studied urban soils is estimated as “moderately dangerous” and “permissible”.

Semenova I.N., Kuzhina G.Sh., Seregina Y.Y., Yagafarova G.A., Zulkarnaev A.B., Musin Kh.G.
USE OF PLANT TEST SYSTEMS TO ASSESS THE TOXICITY OF BOTTOM SEDIMENTS ^{[№ 10 ' 2015]}
This article is devoted to research the variability of heavy metals (Cu, Zn, Fe, Cd, Pb, Co, Ni, Mn) in sediments of r. Belaja on the territory of the Republic of Bashkortostan of Beloretsk district. The study of metals in their average content in the sediment form the following decreasing number of elements: Fe>Mn> Zn> Ni> Cu>Pb> Co> Cd. The concentration of Cu, Zn, Cd, Fe, Ni, Co in the sediments of the river exceeded the value of background: сopper — in the 6–15 times, zinc — in the 13–20 times, cadmium — in the 10–13 times, nickel — in the 1.5 times, iron — in the 9–11 times, cobalt — in the 155–185 times, lead — in the 1.6 times. The concentration of manganese in all soils studied watercourse was within the geochemical background. Total index of contamination ranged from 201 to 243. The evaluation of the toxicity of the river sediments were determined by bioassay using the seeds of Lepidium sativum L., Raphanus sativus L., Triticum aestivum L. Learned test systems according to the degree of sensitivity can be arranged in the following decreasing series: Lepidium sativum L. > Raphanus sativus L. > Triticum aestivum L. The greatest sensitivity to contamination had such a test responses as seed germination and seedling root length. In this paper, the connection between the content of heavy metals in bottom sediments exceeding the geochemical background, and a manifestation of the properties of the indicator: increase in the concentration of copper and nickel inhibits seed germination, root length, and seedling dry weight of the plant model. The use of these plant test systems allowed to conclude that the studied soils of r. Belaja are moderately toxic pollution degree, except for the alignment after the confluence r. Tirlyan characterized by narrow riverbed and, as a consequence, increase the speed of its flow with a predominance of the processes leaching of toxic elements from the sediments.

Kuzhina G.Sh., Yanturin S.I.
STUDY OF HEAVY METAL CONTAMINATION IN THE UPPER SECTIONS OF THE URAL RIVER ^{[№ 1 ' 2010]}
Studies of heavy metal contamination in the upper sections of the Ural River and the reservoirs enabled to identify the river sections subject to the anthropogenic load, monitor Сu, Zn, Fe contents in natural water over the summer and fall period of 2008. The results indicate the direction of hydro-chemical processes in the Ural reservoirs.

Kuzhina G.Sh., Yanturin S.I.
RESEARCH OF HEAVY METALS POLLUTION OF BOTTOM-DWELLING DEPOSITS OF UPPER STREAM OF THE URAL RIVER ^{[№ 6 ' 2009]}