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The review is devoted to the analysis of published data on the synthesis and use of magnetic nanoparticles modified by ionic liquids for the separation and determination of various substances in environmental samples. The main attention is paid to the determination of organic pollutants in natural waters, soils, etc. The main trends in the development of magnetic solid-phase extraction methods are noted. Methods for the synthesis of magnetic nanoparticles promising for creating new methods of sample preparation are considered., Author(s): O. B. Mokhodoeva [sup.1], V. V. Maksimova [sup.1], R. Kh. Dzhenloda [sup.1], V. M. Shkinev [sup.1] Author Affiliations: (1) grid.439081.7, 0000 0004 0380 8849, Vernadsky Institute of Geochemistry and [...]

A number of large mining enterprises are located on the territory of the Murmansk region. Dusting overburden dumps and tailings storage sites leads to a complex of long-term consequences for the environment. The output of the silty fraction (–0.071 mm) of "stale" tailings of loparite ore dressing (the first field of the tailing dump) is about 22 %. The investigated material is represented by nepheline, microcline, aegirine; loparite, analcime are diagnosed in impurity quantities; the average content of cerium, lanthanum, neodymium – rare earth elements of the light group – 0.18, 0.03 and 0.015 %, respectively. In laboratory conditions, a simulation of the ingress of a fine fraction of loparite ore dressing tailings into the soil has been carried out; the interaction of tailings material with distilled water and water extract from conditionally background soil at different temperatures has been studied. In the course of the study, it has been found that the introduction of dissolved organic matter intensifies the processes of destruction and partial dissolution of the aluminosilicate matrix of rock-forming minerals; an intensive transition of rare earth elements and heavy metals into soluble forms has been recorded. The research results indicate the ecological danger of the finely dispersed material of "stale" tailings of loparite ore dressing due to the ingress of dust particles into the soil and their interaction with soil waters.

The possibilities of ultrasonic examination in the diagnosis of acute appendicitis are analysed. The ultrasonic parameters are systematized on the basis of examination of 76 patients with various forms of acute inflammation of the vermiform process and of 16 healthy individuals. Exosemeiotics of acute appendicitis is presented. The high significance of USE in complex examination of patients with suspected acute inflammation of the vermiform process difficult for diagnosis is shown. This was confirmed by the results of complex examination of 151 patients with various urgent pathological conditions whose clinical symptomatology was similar to that of acute appendicitis. It was found that USE improves the diagnostics in difficult clinical cases and lessens the number of diagnostic and tactical errors. The wide use of ultrasonic examination in the daily practice of surgical clinics is recommended.