Table 5.6 Results of
groundwater quality
assessment
Indicators
G1
G2
B1
pH
I
–
–
Ammonia nitrogen
II
I
I
Nitrite nitrogen
I
I
II
Total cyanide
I
I
I
Fluoride
I
I
I
Nitrate nitrogen
II
I
III
Chloride
I
I
I
Sulfate
I
II
II
Total soluble solids
II
II
II
Total hardness
I
II
II
Permanganate index
I
I
I
Volatile phenol
I
I
I
Hexavalent chromium
I
I
I
Arsenic
I
I
I
Cadmium
I
I
I
Lead
I
I
I
Mercury
I
I
I
Iron
I
I
I
Manganese
I
I
I
Benzene
I
I
I
Toluene
I
I
I
Ethylbenzene
I
I
I
Xylene
I
I
I
Styrene
I
I
I
1,2-dichloropropane
I
I
–
Vinyl chloride
I
I
–
1,1-dichloroethylene
I
I
–
Dichloromethane
I
I
–
1,2-dichloroethylene
I
I
–
1,1,1-trichloroethane
I
I
–
Carbon tetrachloride
I
I
–
1,2-dichloroethane
I
I
–
Trichloroethylene
I
I
–
1,1,2-trichloroethane
I
I
–
Tetrachloroethylene
I
I
–
Chlorobenzene
I
I
–
1,4-dichlorobenzene
I
I
–
1,2-dichlorobenzene
I
I
–
Trichlorobenzene
I
I
–
Tribromomethane
I
I
–
BaP
I
I
–
Grade of water quality
II
II
III
Level of water quality
Good
Good
Moderate
5.1 Central China
105