Trace element fractions in sediments of urbanised lakes of the arctic zone of Russia

Fractions of trace metals in the sediments of permafrost-affected lakes in Northern Siberia, Lena delta

“…Metals associated with hydrated oxides of Fe and Mn also belong to the most stable compounds. Fe/Mn oxides are significant absorbers of the metals [9,25,27] and can be present in sediments as nodules, cement, or films on solid particles. Metal ions of this fraction can enter the lake water when sediment conditions change into the reducing environment (Eh decrease).…”

“…Note. 1 -According to [12,13]; 2 -According to [3]; 3 -% of dispersed organic matter in the sediments according to [9] Characteristics Lake 1 Lake 2 Molo Lake Fish Lake North Lake Shallow Lake Banya 2 Lake Banya 3 Lake Banya Lake Flood Lake Latitude (°) Longitude (°) metal ions. The exceptions are metals associated with insoluble residue (aluminosilicate compounds).…”

“…There are some fractional schemes of trace elements for soils and sediments [5,7,9,17]. In this work, the following metal fractions were extracted: metal exchange forms (fraction 1), metals specifically sorbed by various components of the sediment (fraction 2), metals associated with the most stable organometallic complexes (fraction 3), metals associated with the hydrated Fe and Mn oxides (fraction 4), and the most residual (stable) phase (fraction 5), calculated by subtracting the total for the previous four fractions from the content of acid-soluble forms of the chemical element.…”

“…The assessment of the total content of the elements is necessary for understanding their regional background concentrations in the sediments [8]. However, the migration mobility of metals depends on the type of chemical bonding of the elements with the mineral and organic components of the sediments [9,10]. Humic substances, clay minerals, and Fe/ Mn hydroxides are the main accumulation matrices of elements in lake sediments.…”

Elemental Concentrations of Major and Trace Elements in the Spring Waters of the Arctic Region of Russia

“…The intensive development of the region, which has a population of more than 700,000 people, refused from the discovery of numerous deposits of mineral resources, which have been actively developed since the first half of the 20th century. Their extraction, processing, and transportation has a constant negative impact on the environment, including pollution of both soils [42,43] and water bodies [4,[44][45][46][47][48][49][50][51][52]. At the same time, the territory of the peninsula is marked on the map "Global geography of incident threat to human water security and biodiversity" as an area with a low risk of possible pollution.…”