Māris kļaviņŠ, azamat azizov, JĀnis zaļoksnis environment, pollution, development: the case of uzbekistan

particles absorb the components of petroleum products very well. 
The clay layer may form a geochemical barrier, and as a result the 
pollution flow movement is impeded or stopped completely. In turn, 
the sand in the ground with good aeration properties and due to 
good filtration properties of sediment creates prerequisites that any 
contamination on the surface of the Earth causes corresponding 
groundwater pollution. In cases of gasoline leak into sand soil, the 
petroleum product can reach the depth of more than 5 m within a 
few hours’ time or overnight. 
When oil products access groundwater, due to their physical 
characteristics and the fact that their density is lower than the 
density of water, they accumulate in the upper layer of the ground 
water (on the surface of the water-bearing layer), and in many cases 
a loose (floating) oil layer is formed here.
Natural  environ ment  has  a  selfpurification  ability.  Self puri fi-
cation of soil and groundwater comprises the entire set of processes 
directed toward restoration of the soil, ground and groundwater 
to the original composition and properties. In the soil oxidation, 
The soil may contain oil 
and oil products in the 
following phases:
1.  in gaseous phase 
among the soil mineral