2 ОРГАНИЗАЦИЯ И МЕТОДИКА РАБОТ - Courrier international

When soil is contaminated with one inorganic substance, the contamination level is assessed taking
into account the class of hazard of the contaminant, its MPC and the maximum value of permissible
level of the element content Kmax by one of the four nuisance values.
When soil is contaminated with one organic substance, its hazard is determined by its MPC and
class of hazard (Table 5.3-12).
Pollution class
Clean *
Permissible
Moderately
hazardous
Khlebnik
ov
sanitary
number
0.98 and
>
0.98 and
>
0.85-
0.98
Table 5.2.2 Assessment of chemical soil pollution
Content in soil (mg/kg)
Total
pollution
index (Zc) Organic
compounds
-
5 MPC > max >5 MPC > max
Organic
compounds
from
background
to MPC
from 1 up
to 2 MPC
from 2
to 5 MPC
Inorganic
compounds
FINAL REPORT for Contract No. CS-NPA-Arctic-13/2009 of December 01, 2009 within the framework of pilot project Development of
Technology of clean up of the area of Decommissioned Sites of The Russian Federation Ministry of Defense in the Arctic by the
Example of Alexanra Island of Franz Josef Land Archipelago from Hazardous Waste
77
from
background
to MPC
from 2
background
up to MPC
from MPC
to max
> 5 MPC > max
In case of contamination with several elements, soil contamination hazard level can be assessed for
the most toxic element whose content in soil is the highest.
The level of soil contamination as an indicator of adverse impact on human health is assessed by
indices developed in the course of complementary geochemical and geohygienic environmental
studies of the localities with active contamination sources. These indices are as follows: chemical
concentration ratio (Cc). Cc is determined by a ratio of the actual content of the chemical to be
determined in soil (Ci) in mg/kg of soil to the regional background value (Cbi):
Cc = Ci/ Cbi;
and total pollution index (Zc). The total pollution index is equal to a sum of the ratios of
concentrations of chemical contaminants and can be expressed by a formula
Zc = (Cci + +Ccn) (n-1),
where n is a number of summed substances to be determined;
Cci is a concentration ratio of contaminant i.
The level of soil contamination with a series of metals by index Zc is assessed through the use of a
rating scale given in Table 5.2-13..