Geology, geography and global energy

Scientific and Technical Journal

Geo-ecology of heavy metals in various water ecosystems located in the northern sector of the Caspian Sea

2013. №1, pp. 180-189

Alykov Nariman M. - D.Sc. in Chemical, Professor, Astrakhan State University, 20a Tatishchev st., Astrakhan, Russian Federation, 414056, alikovnm@rambler.ru

Chuyko Yelena V. - Engineer, FBI "SevKasptekhmordirektsiya", 106 Dorozhnaya st., Astrakhan, Russian Federation, 414018, chev@inbox.ru

Kurochkina Tatyana F. - D.Sc. in Biology, Professor, Astrakhan State University, 20a Tatishchev st., Astrakhan, Russian Federation, 414056, geologi2007@yandex.ru

Popova Olga V. - Research assistant, FGUP «KaspNIRH», 1 Savushkin st., Astrakhan, Russian Federation, 414056, geologi2007@yandex.ru

Markova Oksana S. - C.Sc. in Biology, Accociate Professor, Saint Petersburg State University, 7–9 Universitetskaya naberezhnaya, St. Petersburg, Russian Federation, 199034, geologi2007@yandex.ru

The article presents an analysis about the long-range variability of heavy metals (including copper, lead, zinc and nickel) in the water, sediment and fish fauna in the western part of the Northern Caspian Sea. It adds that most of the metals were transferred in a suspended solid state. The exception, the critique relates, is zinc, which was transferred principally in a dissolved condition. At this stage, the paper states that the metal migration underwent seasonal variations as to the dominant form. The maximum percentage of dissolved zinc forms was incorporated in 2002, having an average of 68.2 %. By contrast, the percentage of suspended copper particles in dissolved form varied from 73.8 % to 90.7 %, with an average of 70.7 %. The shared weighted forms of lead, for their part, averaged from 52.4 % to 77.0 % throughout the assessment period. Subsequently, the document stated that the most significant dissolved-weighted-form periods occurred in September 2002 and July-August 2009, with the metal proportion in the solution exceeding 50 %. The study also noted an increase in the percentage of nickel and lead in the bottom sediments. There is also a close positive correlation between the nickel content in the solution and in the annual sediment offset. In conclusion, the blueprint related that additional heavy metal trials and analyses were performed in the muscles of small fish (roaches, sprats and gobies), assessing the absorbed metal content (and indicating the potential chronic nature of contamination).

Key words: heavy metals,Northern Caspian Sea,long-standing dynamics,dissolved and weighted forms,bottom deposits,hydrobionts,content,maximum permissible concentration,height of terrain

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