Table 5.77
(continued)
Test items
Sampling position
Class III standard for
groundwater quality
1 m below the water level
1/2 of the well depth below the
water level
3/4 of the well depth below the
water level
Cobalt
<0.005
<0.005
<0.005
<0.005
<0.005
<0.005
0.05
Mercury
<0.00005
<0.00005
<0.00005
<0.00005
<0.00005
<0.00005
0.001
Arsenic
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
0.05
Selenium
<0.0004
<0.0004
<0.0004
<0.0004
<0.0004
<0.0004
0.01
Cadmium
<0.0001
<0.0001
<0.0001
<0.0001
<0.0001
<0.0001
0.01
Hexavalent
chromium
<0.004
0.005
<0.004
0.004
<0.004
<0.004
0.05
Lead
0.0025
0.0026
0.0025
0.0025
<0.0025
0.0025
0.05
Beryllium
<0.00002
<0.00002
<0.00002
<0.00002
<0.00002
<0.00002
0.00002
Barium
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
1.0
Nickel
<0.005
<0.005
<0.005
<0.005
<0.005
<0.005
0.05
Permanganate index
1.2
1.3
1.2
1.3
1
1.2
3.0
Total coliforms
Not detected
Not detected
Not detected
Not detected
Not detected
Not detected
3.0
Total number of
bacteria
23
26
22
24
22
23
100
Unit: mg/L (pH: dimensionless, turbidity: NTU, chroma: degree)
5.4 Southeast China
247