STUDY OF HEAVY METALS AND ARSENIC CONTENT IN SOILS OF THE COASTAL ZONE OF THE CASPIAN SEA OF THE KAZAKHSTAN SECTOR
Kanbetov A.Sh. Muldakhmetov M.Z. Kulbatyrov D.K. Shakhmanova A.K. Abilgaziyeva A.A.
2022National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022#2022Issue 4109 - 121 pp.
The study of the content of heavy metals and arsenic in the soils of the Caspian coast is of great practical importance. It is necessary to monitor the ecological state of the soil and assess the degree of its pollution on the existing situation. The so-called background content of heavy metals and arsenic in the soils of the coast will serve as a reference point for the study of contaminated soils in the event of an emergency oil spill, and will also reliably determine the rate and degree of their contamination. Generally accepted methods and methods were used in conducting the observations. Chemical contamination of soils according to the results of the study has not been established. The concentrations of gross forms of heavy metals are also below the established standards of maximum permissible concentrations (MPC), with the exception of single exceedances of gross copper. The exception is arsenic, the content of which almost everywhere exceeds the values of MPC, the maximum concentrations of which reach 7.1 MPC. High concentrations of arsenic are a regional natural geochemical feature of the territory, which are noted in the results of a number of research works carried out in the Caspian region. A feature of the studied area is the extremely low content of mobile forms of heavy metals, the concentrations of which are hundredths of the MPC, including in areas where there was an excess of gross forms. The MPC indicators established by regulatory documents often do not take into account the geochemical features of the province and, moreover, the local features of the soil cover formed in natural abnormal territories. In soils above geochemical anomalies, some elements may be contained in an amount comparable to that observed in technogenically heavily polluted soils, or even exceed it. According to the results of laboratory analyses, it can be concluded that the influence of technogenic factors on the content of heavy metals and arsenic in soils has not been revealed.
arsenic , Caspian coast , heavy metals , Kazakhstan sector , soil
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Non-profitJSC «Atyrau Oil and Gas University named after Safi Utebayev», Atyrau, Kazakhstan
National Academy of Science Republic of Kazakhstan, Almaty, Kazakhstan
Non-profitJSC «Atyrau Oil and Gas University named after Safi Utebayev»
National Academy of Science Republic of Kazakhstan
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