The proposed model of cation sorption processes with natural organic matter of peat deposits could be applied in a wide pH range. Model testing was produced on the basis of field migration experiment, which was carried out at Lomonosov Diamond Deposit (Arkhangel'sk Region, Russia). It was shown that taking into account the double porosity is necessary for the correct forecast of transport of dissolved compounds in peat.
The results of field works at the site of groundwater pollution by petroleum products in Suida settlement of the Leningrad region are discussed. Drilling and hydrogeochemical survey allowed to map the pollution halo. A lens of free petroleum products was detected on the surface of the ground aquifer near the fuel and lubricant depot. Recommendations on organization of drinking water supply in the area and prevention of further groundwater contamination were given.
A series of laboratory experiments to study the diffusion of radioactive tracers (''Sr, 36 C1) was performed on samples of Cambrian clays. The use of radioactive isotopes makes it possible to avoid superposition of osmotic processes, changes in migration forms of elements and other phenomena during the diffusion experiment. The self-diffusion coefficients of individual ions are evaluated, whereas binary diffusion coefficients are evaluated in the trait experiments. The dependence of diffusion coefficients on solution concentration and concentration gradient is studied.
Hydrogeochemical and isotopic sampling of groundwater and surface water in the Almansora River basin was carried out in works on groundwater resources estimation in the province of Almeria (Spain). Surface and ground waters sampled in the Almansora River basin coincide with the general trend of atmospheric precipitation isotopic composition of the Mediterranean region, indicating an exclusively meteoric origin of ground and surface waters, the absence of significant isotopic fractionation after atmospheric precipitation, in particular due to evaporation. The insignificant role of transit flow in groundwater recharge within the hydrogeological unit of Auvers is shown.
