TRACE ELEMENTS IN THE WATER OF SMALL RIVERS OF THE ANYU RIVER BASIN (WESTERN MACRO-SLOPE OF THE NORTHERN SIKHOTE-ALIN)

Abstract

The relevance of the study lies in the need to assess the content of trace elements in the water of mountain-taiga rivers of the Amur region draining catchments with burnt areas after the catastrophic fires of 1998 and tin ore occurrences. Objective: to assess the content of trace elements in the water of small rivers of the Anyu River basin, to identify the factors determining their variability. Objects: mountain-taiga watercourses in the Anyu River basin (right-bank tributary of the Lower Amur River). Methods: filtration of water samples through membrane filters with a pore diameter of 0,45 μm by acidifying with nitric acid; determination of trace elements by inductively coupled plasma mass spectrometry at the ICP-MS Agilent 7500cx in the Center collective use at the IWEP RAS. Results. The content of dissolved forms of trace elements in the water of taiga rivers of the Anyu River basin in 2011–2016 is characterized. The materials obtained allow us to estimate their values, temporal fluctuations and ratios in different sections of the basin. Increased concentrations of dissolved forms of Mn, Fe, Zn, Ba, Cu, Ni, Se associated with the geochemical features of the territory were found. It is shown that temporal fluctuations in the content are primarily determined by the hydrological situation in the watershed. The role of waterlogged taiga landscapes in the plain part of the basin and the increase in the content of organic matter on increasing the geochemical mobility of Fe, Mn, Cu, Ni, to a lesser extent Co, Al, V due to migration as complex compounds with dissolved organic matter is noted.

Keywords

• anyu river basin
• northern sikhote-alin
• taiga rivers
• trace elements
• spatial and temporal variability