Characteristic features of molybdenum, copper, tungsten and rhenium accumulation in the environment

The article deals with the assessment of biogenic migration of molybdenum and other trace elements in ore and background conditions. The purpose of this study was to determine the specific features of copper and/or molybdenum accumulation rates in animals against the background of various tungsten and rhenium content levels in the environment and animal feeds, as well as possible metals incorporation into XO-XDH of cow milk. The field biogeochemical studies were performed in summer 2009, 2012, and 2018 in ore landscapes of W-Mo deposits (Tyrnyauz) and background areas of the North Caucasus with the selection of breeds, soils, natural water, plants, animal blood, and dairy products. For comparison, dairy products from the Moscow region were also examined. It was established that metals accumulated not only in soils but also in pasture plants. High content of molybdenum in the blood of cows in ore regions accompanied by a sharp decrease in the concentration of copper was noted. The concentration of studied metals in buttermilk in ore regions increased by 5–10 times in comparison with the control zone. When studying W-Mo ore landscapes of the North Caucasus (Tyrnyauz), the tungsten and rhenium were found to be capable of incorporation into the xanthine enzyme fractions (oxidase) in animals. This fact was discovered for the first time. In the case of an increase in the content of molybdenum and/or tungsten (rhenium) in the environment, the migration of the latter metals is significantly enhanced in ore conditions.