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STUDY OF THE CONTENT OF SALTS OF HEAVY METALS IN THE ROOTS AND ROOTES OF NETTROL

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Background. Stinging nettle (Urtica dioica L., this. Urticaceae-nettle) is a popular medicinal plant. One of the most important tasks of the ecological physiology of plants is to study the response of plants to heavy metals, which, at elevated concentrations, have a toxic effect on a wide variety of physiological processes. This problem is not only of obvious practical importance, which is associated with the everincreasing environmental pollution with heavy metals, but also has an important fundamental value, which is associated with the study of adaptation mechanisms and the resistance of plants to heavy metals. Among them, Cd and Pb are the most common toxic elements, while Ni and Zn are trace elements. The roots and rhizomes of nettle contain micro- and macroelements: zinc, copper, lead, arsenic, iron, vanadium, manganese, sodium, calcium and other substances. Purpose. The aim of this work is to study heavy metals and a comparative study of the micro-and macroelement composition of Urtica dioica L., which grows in high-mountainous regions of the Republic of Uzbekistan. Methodology. The study of the elemental composition of the studied raw materials was carried out using the ECI ICP method, using an Optima-2400 DV device (Perkin Elmer USA). The sample preparation method is based on microwave, wet, acid-peroxide decomposition in a BERGHOF microwave with Speebwave TM MWS-3 + software. Originality. For the first time, the content of heavy metal salts in Urtica dioica L., growing in the mountainous regions of the Republic was investigated. Fingdings. The composition of the roots and rhizomes of nettle, growing in the mountainous regions of the Republic of Uzbekistan, the content of heavy metal salts is relatively less compared with the literature data, indicating a lower soil contamination in mountainous areas. The content of macro- and microelements in the roots and rhizomes of Urtica dioica, consists of more than 25 elements, of which 34% are essential, 21% are heavy, and 45% are other elements. It was shown that the content in the raw material of such heavy metal salts as: copper is 0.0271 mg / kg, lead is 0.0753, arsenic is 0.0066 mg / kg, zinc is 0.0813 mg / kg, and mercury and cadmium are absent. Along with this, the following macronutrients were found: potassium55.4874 mg / kg, calcium-33.9675 mg / kg, magnesium-15.8099 mg / kg, iron-6.7597 mg / kg sodium6.1145 mg / kg, barium-1.735 mg / kg, and trace elements: manganese-0.2043 mg / kg, lithium-0.0337 mg / kg, bismuth-0.0142 mg / kg, nickel-0.0150 mg / kg and others. Highlights: * the quantitative content of heavy metal salts was studied for the first time. * the content of macro- and microelements in the roots and rhizomes of nettle. * comparative studies with literature data were conducted.

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# macro- and microelements# крапива двудомная# соли тяжёлых металлов# микро- и макроэлементы# оптико-эмиссионная спектрометрия# икки уйли чаёнўт# оғир металл тузлари# микро- макроэлементлар# оптик эмиссион спектрометри# stinging nettle# salts of heavy metals# optics emission spectrometry

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https://eroi.uz/11.0030/A1119-0013

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