Comparative analysis of the chemical composition of atmospheric aerosol at the monitoring sites in the Baikal Region

The paper presents the results of studies aimed at the analysis and assessment of atmospheric pollution over the Lake Baikal in the summer. This information is necessary to create physical models of the formation and transfer of atmospheric aerosol fields, taking into account the physical and geographical features of the Baikal region. Measurements were carried out by a lidar «LOSA-A2» installed on the scientific-research vessel «Academician V.A. Koptyug». The vessel’s route passed along the South, Middle and Northern Baikal, from July 15, 2018 to July 26, 2018. At the same time, observations were conducted using lidar «LOSA-M2». It was located in the background area at Boyarsky stationary site (51.84° N, 106.06° E), in the south-eastern part of the lake. The results of changes in the spatial structure of atmospheric aerosol fields in background conditions and during forest fires are shown.

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Kwestia chronologii, typologii i pochodzenia szklanej biżuterii z wczesnośredniowiecznego ośrodka grodowego w Gnieźnie

Folia Praehistorica Posnaniensia ◽

10.14746/fpp.2020.25.11 ◽

2020 ◽

Vol 25 ◽

pp. 247-289

Author(s):

Joanna Sawicka

Keyword(s):

Comparative Analysis ◽

Chemical Composition ◽

Glass Composition ◽

Starting Material ◽

14C Dating ◽

Glass Strip ◽

X Ray ◽

General Manner ◽

Physico Chemical ◽

Early Settlement

The study presents 175 artefacts from the settlement center in Gniezno – beads and rings. The materials come from settlement levels from around the mid-10th to the 13th centuries. The latest chronological findings based on 14C dating have made it possible to refine the dating, especially of the early settlement levels of the stronghold, where the vast majority of glass artefacts come from. Threeba sic groups of beads have been distinguished based on the technique of their production – beads made of a drawing a tube, the technique of winding a glass strip, as well as casting and sintering. The results of 7 physico-chemical analyzes of the glass composition (performed with the X-Ray Fluorescence, XRF method) are presented. Physicochemical analyzes of the chemical composition of the tested beads made it possible to determine the technological group and the type of glass. An attempt was made to explain the origin of the starting material (glass) for jewelery. A comparative analysis made it possible to indicate in a general manner possible manufacturers and to outline the likely directions of the influx of these glass ornaments to Gniezno.

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Geological nature of mineral licks and the reasons for geophagy among animals

10.5194/bg-2016-336 ◽

2016 ◽

Author(s):

Alexander M. Panichev ◽

Vladimir K. Popov ◽

Igor Y. Chekryzhov ◽

Ivan V Seryodkin ◽

Alexander A. Sergievich ◽

...

Keyword(s):

Comparative Analysis ◽

Chemical Composition ◽

Volcanic Belt ◽

Sikhote Alin ◽

Forage Plants ◽

Geological Conditions ◽

Mineral Substances ◽

Mineral Licks ◽

Toxic Concentrations ◽

Early Cenozoic

Abstract. In this paper, the reasons for geophagy (the eating of rocks by wild herbivores) in two regions of the Eastern Sikhote-Alin volcanic belt are considered. The mineralogical and chemical features of the consumed rocks, and also the geological conditions of their formation are investigated. A comparative analysis of the mineral and chemical composition of the consumed rocks and the excrement of the animals, almost completely consisting of mineral substances, is carried out. It is established that the consumed rocks are hydrothermally-altered rhyolitic tuffs located in the volcanic calderas and early Cenozoic volcano-tectonic depressions. They consist of 30–80 % from zeolites (mainly clinoptilolites) and smectites, possessing powerful sorption properties. According to the obtained data, the main reason for geophagy may be connected with the animals’ urge to discard excessive and toxic concentrations of certain elements that are widespread in specific habitats and ingested with forage plants.

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ECOGEOCHEMICAL DIAGNOSTICS CONDITION OF URBAN ENVIRONMENT ON POLLUTION SNOW COVER OF VORONEZH CITY

Samara Journal of Science ◽

10.17816/snv20154103 ◽

2015 ◽

Vol 4 (4) ◽

pp. 121-126

Author(s):

Tatiana Ivanovna Prozhorina ◽

Semyon Aleksandrovitch Kurolap ◽

Nadezhda Ivanovna Yakunina

Keyword(s):

Comparative Analysis ◽

Chemical Composition ◽

Snow Cover ◽

Urban Environment ◽

Chemical Elements ◽

Rapid Assessment ◽

High Sorption ◽

Express Methods ◽

Functional Areas ◽

The City

Currently, the most popular are the express methods of quality control of the environment, which permit a relatively rapid assessment of ecological and geochemical situation. one such method is based on the use snow cover. snow has a high sorption capacity and is informative in identifying the object of man-made pollution of the urban environment. the paper presents the results of a study of the chemical composition of snow that had fallen in Voronezh during winter 2015. snow samples were taken in the period prior to snowmelt in various functional areas of the city. in order to identify the degree of technogenic impact on the various parts of the city of Voronezh, was made a comparative analysis of the results:аccording to the actual presence of pollutants in precipitation for the study of functional areas;сalculate the rate on the concentration of chemical elements for test samples of snow.according to the degree of mineralization and dust content in snow can be seen technogenic pressure on environment.therefore, a comparative analysis of the degree of contamination of snow in the various functional areas of the city were carried out for the two indicators of the chemical composition - the total mineralization and suspended particles(dust).the results of the analysis of the chemical composition of the melt water indicate an increased level of technogenic pollution of snow cover in all investigated functional areas of Voronezh.

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