Twenty-seven sediment samples from the eastern Laptev Sea were analyzed for mercury and total organic carbon as well as grain-size distribution. The average total mercury (THg) concentrations in sediments are 29±14 µg kg-1. A significant correlation of THg content with total organic carbon and clay and silt fractions was shown. The 210Pb-dated sediment core was used to evaluate the contamination degree and flux ratios of Hg in sediments from the eastern Laptev Sea. The average sedimentation rate for the all dated intervals was 0.17 cm/year. The THg flux increased from 20-28 µg/m2/year in the period of 1892-1950 to 53-59 µg/m2/year in the modern period of 2011-2015. According to various indices, the ecological risk from THg in studied sediment was low.
2023. V. 187, Art. no. 114576

Sediment samples from 53 stations of the southwestern Chukchi sea were investigated to the spatial distributions and assess the state of trace metals contamination using ecological indices. The mean concentrations (mg kg-1) in sediments were: Cr (70.5), Ni (41.0), Cu (16.5), Zn (82.7), As (15.90), Cd (0.27), Pb (15.96), Hg (32.0 μg kg-1). The spatial distribution pattern of trace metals was similar with maximum values in the northern of the Chukchi Sea in the outer shelf sediments, while the high values of Cd were noted at stations located in the southern part of the sea where a strong influence of the Pacific waters penetrating through the Bering Strait. The ecological indices indicated no signs of anthropogenic pollution in the study sediments of the Chukchi Sea. Received data are of value for detecting and tracking future chemical changes in the sediments of the Chukchi sea, particularly in light of environmental changes.
2022. V. 180, Art. no. 113797

Проживание в высоких широтах, в том числе в Евро-Арктическом регионе, предъявляет повышенные требования к психофизиологическому состоянию организма человека, который подвергается специфическому воздействию высокоширотных факторов окружающей среды, приводящих к снижению устойчивости организма и сокращению продолжительности жизни. Цель работы. Определить уровень тревожности и частоту выявления высокой тревожности как проявления психоэмоционального напряжения у студентов в арктических условиях в зависимости от возраста и курса обучения. Материалы и методы. В исследовании приняли участие 133 студентки медицинского колледжа, средний возраст которых составил 21,15±5,89 года. Тестирование психоэмоционального состояния проводилось в соответствии с методикой Ч.Д. Спилбергера-Ю.Л. Ханина. Проводилось ранжирование показателей в зависимости от курса обучения и возраста испытуемых. Результаты. У 33 испытуемых студенток обнаружена высокая ситуативная тревожность (СТ) (25%). Процентное соотношение высокой ситуативной тревожности и её средний уровень снижается к 4 курсу обучения. У многих студенток высокая СТ сохраняется до 4 курса и может быть связана с адаптацией к учебному процессу и проведением контрольных испытаний. В 60% случаев выявлен высокий уровень ЛТ. Высокая ЛТ чаще выявляется в начале обучения и снижается в зависимости от длительности обучения (курса), но у студенток старше 25 лет отмечается рост ЛТ, что можно объяснить сложностями совмещения семейных и трудовых обязанностей с обучением. Заключение. Исследование психоэмоциональной сферы у студенток медицинского колледжа показало, что они представляют группу риска по развитию психоэмоционального напряжения и психосоматических состояний в процессе обучения. Living in high latitudes, including in the Euro-Arctic region, places high demands on the psycho-physiological state of the human body, which is subjected to the specific effects of high-latitude environmental factors leading to a decrease in body resistance and reduced life expectancy. Objective. Determine the level of anxiety and the frequency of detection of high anxiety, as manifestations of psycho-emotional stress among students in Arctic conditions, depending on age and course of study. Subject and methods. The study involved 133 female students, the average age was 21,15±5,89 years. Testing of the psycho-emotional state was carried out in accordance with the method of Ch.D. Spielberger - Yu.L. Hanin. The indicators were ranked according to the course of study and the age of the subjects. Results. 33 anxious students were found to have high anxiety. The frequency of identifying high situational anxiety (SA) in a percentage ratio is 25% and its average level rises to 3 class inclusively and decreases to 4 years of training. High SA in many female students lasts up to 4 class and can be associated with adaptation to the educational process and conducting control tests. In 60% of cases, high levels of personal anxiety (PA) were found. High PA is more often detected at the beginning of training and decreases depending on the length of study (class), but among students over 25 years old there is an increase in PA, which can be explained by the difficulty of combining family and work responsibilities with training. Conclusion. The study of the psycho-emotional sphere of female students of the medical college showed that they represent a risk group for the development of psycho-emotional stress and psychosomatic states in the learning process.
http://vestnikural.ru/article/tom-16-2 10.22138/2500-0918-2019-16-2-195-201