Ecology: task 0003

Calculate the index of water pollution (WPI). The characteristics and quality of the surface waters of the Voronezh reservoir are given in table. 1 and 2. Give a comparative ecological assessment of the reservoir waters.

Table 1 - Characteristics of the surface waters of the Voronezh reservoir

Ingredients MPC, Concentration of pollutants in surface waters according to control
mg / m3 in sections, mg / m3
Chertovitsky Bridge 2,5 km. below the city of Voronezh 7,0 km. below Voronezh
(5,5 km above the city of Voronezh)
Dissolved oxygen At least 6,0 7,28 8,64 9,83
Suspended substances 16,15 6,6 15,9 12,0
BOD5 3,00 1,88 3,3 2,88
Nitrates 0,08 0,02 0,026 0,008
Phosphates 0,2 0,2 0,47 0,2
Chlorides 300,0 244,0 43,8 27,5
Iron 0,1 0,18 0,1 0,06
Copper 0,001 0,0008 0,003 0,002
Zinc 0,01 0,0025 0,0035 0,0022
Lead 0,006 0,0001 0,001 0,007
Petroleum products 0,05 0,21 0,44 0,25

According to table 2, depending on the WPI value, the water quality class is determined.

Table 2 - Water characteristic

WPI Water quality class Water quality assessment (characteristic)
Less than or equal to 0,2 I Very clean
More than 0,2 - 1 II Pure
1 - 2 III Moderately polluted
2 - 4 IV Contaminated
4 - 6 V Dirty
6 - 10 VI Very dirty
Over 10 VII Extremely dirty