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The humus acids, which are part of organic matter, are an important part of the soil. Their properties affect the various pollutants, including trace metals. The article presents the structural and functional composition of humuc acids in the Euro-Arctic zone soils, which was investigated by the methods of molecular spectroscopy. An assessment of ecoprotective role to trace metals was made, which especially important for sensitive Arctic soils, formed under the influence of permafrost (cryogenic) processes. Differ...