MONITORING PROBLEMS OF ROSTOV-ON-DON CITY AREA SOIL POLLUTION

Abstract

The paper presents the research results of the territory contamination of the shooting and stand complex of the North Caucasus Military District Military Hunting Society, the interregional sports organization, operating in Rostov-on-Don since 1992. This object is identified as a source of contacting environment contamination with lead and its compounds, since the lead shot is used at the complex shooting areas. Series of soil samples were selected at different distances from the targets in accordance with the requirements of regulatory documents, taken from the surface layer to the depth of 10-15 cm. The acidity level was measured, in the aqueous extract, which on average had a pH value of ~ 7 corresponding to a neutral medium. Visually lead shot of various degradation degree is found in the samples. 2,5 grams of lead were extracted mechanically from 1 kg of the composite sample, which significantly exceeds the established standard (0.032 g / kg). A qualitative chemical analysis of aqueous extract confirmed the presence of lead compounds. Quantitative chemical analysis of lead mobile acid-soluble forms was carried out by inversion voltammetry according to the procedure of MU 08-47 / 56 on the TA-Lab device in extracts obtained by treating the 1 M of soil sample with HNO3 solution. The average concentration of lead ions in the selected samples was 65 g / kg. Considering that apartment block is situated near the contaminated area, the necessity of its clearing from pollutant is evident. It was suggested to recultivate the top layer of the soil by removing it and complex processing, firstly by a physical method to extract metallic lead, and then by reagent to remove lead compounds. The composition and concentration of reagents depends on the type of soil and the level of its contamination with lead.