ON MAGNETIC POLLUTION AND ACIDIFICATION OF SOILS FROM KYIV OUTSKIRTS COMPARED TO BACKGROUND SOILS

Purpose. The purpose of the article is to prove a hypothetic possibility of their existing a conjoint way of magnetic and acid soil contamination of the Kyiv city metropolitan area outskirts. Design/methodology/approach. The dependence between magnetic susceptibility (?) and hydrogen parameter pHKCl in soddy and soddy-podzolic soils is studied in two research areas: the park area Pushcha-Voditsa (Kyiv city, Ukraine) and the area near the village Klavdiyevo-Tarasove located 40 km far from the city. Findings. ? of surface soil horizon in Pushcha-Voditsa varies from 5 to 77?10?8 m3/kg, in Klavdiyevo-Tarasove ? within 5...26?10?8 m3/kg. Areas with high values of ? in Pushcha-Voditsa tend to be closer to roads with heavy traffic. The traces of magnetic pollution defined based on the analysis of the high-temperature behavior curves of the magnetic susceptibility of soils from Pushcha-Voditsa. In the soil from Pushcha-Voditsa, as well as in the contaminated samples from the streets of Kyiv city with relatively high isothermal ? , a wide and high peak in the vicinity of 5000 was observed, interpreted as Hopkin peak, which is characteristic of fine single-domain magnetite, likely of anthropogenic origin. It is shown that the samples from Pushcha-Voditsa with high ? are likely to have low pHKCl values, i.e., there is a negative correlation between these parameters (r = ?0.57). No such trend observed for the samples from the background area of Klavdiyevo-Tarasove. Practical value/implications. The results obtained suggest a conjoint way of magnetic and acid soil contamination of the Kyiv city metropolitan area outskirts, which is a fallout of solid and liquid precipitation from the atmosphere. As a result of the high temperature transformation of iron sulfides contained in coal and other natural fuels of power plants, a particular substance comprising iron oxides and sulfur dioxide, which causes acidification of precipitation, is emitted to the atmosphere. Due to a high concentration of exhaust gases in the surface air in the vicinity of roads with heavy traffic, fine magnetic particles and nitric acid, which is formed as a result of the interaction of nitrogen dioxide with water, reach the soil.