Test items

Water samples

pH

Suspended matter

Chemical oxygen demand

Ammonia nitrogen

Mine water 1 # in the central

8.09

7.5

<10

<0.025

Mine water 1 # in the south

8.56

<4

<10

<0.025

Domestic sewage 1 # in the central

8.26

<4

<10

0.21

Domestic sewage 1 # in the south

8.25

<4

<10

2.54

Mine water 2 # in the central

8.27

14

<10

0.12

Mine water 2 # in the south

8.61

10

<10

0.14

Domestic sewage 2 # in the central

­8.43

13

<10

0.12

Domestic sewage 1 # in the south

8.11

13

12

6.11

Mine water 3 # in the central

8.07

4

<10

0.025

Mine water 3 # in the south

8.53

<4

<10

0.06

Domestic sewage 3 # in the central

7.93

4

<10

0.22

Domestic sewage 1 # in the south

7.73

6

<10

4.37

Level 1 standard of GB8978-1996

6 - 9

70

100

15