Fractions of trace metals in the sediments of permafrost-affected lakes in Northern Siberia, Lena delta
Summary The aim of the study is to estimate the role of sediment components in the accumulation of microelements in lakes of the permafrost-affected area (the Lena Delta, northern Siberia). A fractional analysis of several trace elements (V, Cr, Co, Ni, Cu, Zn, Sn, and Pb) was conducted. Samples wer...
Published in: | Arctic and Antarctic Research |
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Main Authors: | , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт
2022
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Subjects: | |
Online Access: | https://www.aaresearch.science/jour/article/view/444 https://doi.org/10.30758/0555-2648-2022-68-2-160-172 |
Summary: | Summary The aim of the study is to estimate the role of sediment components in the accumulation of microelements in lakes of the permafrost-affected area (the Lena Delta, northern Siberia). A fractional analysis of several trace elements (V, Cr, Co, Ni, Cu, Zn, Sn, and Pb) was conducted. Samples were collected from 10 lakes during the summer period of the “LENA 2019” expedition. The content of the chemical elements in the sediments was measured with the ICP-MS instrument. The results of the work show a relatively homogeneous distribution of the acid-soluble forms of the metals in sediments from different lakes. The content of trace elements in all the lakes studied is determined by natural (lithogenic) sources. Stable minerals inherited from the rocks play a crucial role in the sediment formation. Most of the elements are predominantly fixed in stable mineral and organometallic fractions. However, for V, Co, and Cr a high level of geochemical mobility was identified in some of the lakes. The metals of soluble complexes are capable of migrating from the sediments to the water due to physical and chemical changes in the aquatic environment. Furthermore, the organic substances and the Fe/Mn hydroxides of the sediments have a low potential ability to bind the metals into stable compounds. Цель исследования — оценка роли компонентов донных отложений в накоплении микроэлементов в озерах криолитозоны (дельта Лены, северная Сибирь). Проведен фракционный анализ некоторых микроэлементов (V, Cr, Co, Ni, Cu, Zn, Sn, Pb). Пробы были отобраны из 10 озер в летний период экспедиции «ЛЕНА 2019». Содержание химических элементов в осадках измеряли прибором ICP-MS. Результаты работы показали относительно однородное распределение кислоторастворимых форм металлов в донных отложениях разных озер. Большинство элементов преимущественно закреплено в устойчивых минеральных и металлоорганических соединениях. Однако для V, Co и Cr в некоторых озерах отмечен высокий уровень подвижности. Металлы растворимых комплексов способны мигрировать ... |
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