volatile phenol, total cyanide, fluoride, chloride, and hexavalent chromium; heavy
metal indicators include arsenic, mercury, cadmium, iron, manganese, and lead.
In addition, 26 organic indicators were selected, including monocyclic aromatic
hydrocarbons (benzene, toluene, ethylbenzene, xylene, and styrene), fumigant
(1,2-dichloropropane), halogenated aliphatic hydrocarbons (chlorine ethylene,
1,1-dichloroethylene, dichloromethane, trans-1,2-dichloroethylene, cis-1,2-dichloro
ethylene, 1,1,1-trichloroethane, carbon tetrachloride, 1,2-dichloroethane, trichloro ethylene, 1,1,2-trichloroethane, and tetrachloroethylene), halogenated aromatic hydrocarbons
(chlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, 1,2-dichloro benzene, and
1,2,4-trichlorobenzene), trihalomethanes (chloroform, bromodichloro methane, dibromochloromethane chloride and bromoform), and PAHs (BaP).
The specific test and analysis methods are as shown in Table 5.1.
Fig. 5.6 Change in groundwater flow field
Table 5.1 Methods for water quality monitoring and analysis
Indicators
Method
Detection limit
Unit
Ammonia nitrogen
GB/T 5750.5-2006
0.025
mg/L
Nitrite nitrogen
GB/T 5750.5-2006
0.01
mg/L
Total cyanide
GB/T 5750.5-2006
0.004
mg/L
Fluoride
GB/T 5750.5-2006
0.05
mg/L
Nitrate nitrogen
GB/T 5750.5-2006
0.1
mg/L
Chloride
GB/T 5750.5-2006
10
mg/L
Sulfate
GB/T 5750.5-2006
0.1
mg/L
Total soluble solids
GB/T 5750.4-2006
5
mg/L
Total hardness
GB/T 5750.4-2006
5
mg/L
Permanganate index
GB/T 5750.7-2006
0.5
mg/L
Volatile phenol
GB/T 5750.4-2006
0.002
mg/L
Hexavalent chromium
GB/T 5750.6-2006
0.004
mg/L
Arsenic
GB/T 5750.6-2006
0.005
mg/L
Cadmium
GB/T 5750.6-2006
0.0001
mg/L
Lead
GB/T 5750.6-2006
0.001
mg/L
(continued)
5.1 Central China
99