Table 6 Water Quality Monitoring Data of the Grand Canal (Suzhou)

From: On conservation of world heritage Beijing-Hangzhou grand canal for enhancing cultural ecosystem services

Site

 

COD

 

TN

 

TP

 

PH

NH3-H

 

EC

DO

NO3-N

Combined pollution index

Standard

 

 ≤ 30

 

 ≤ 1.5

 

 ≤ 0.3

 

6–9

 ≤ 1.5

  

0

  

A

 

27

IV

1.07

IV

0.137

III

7

0.666

III

373

8.8

0.485

Qualified(IV)

 

P

0.900

 

0.713

 

0.457

  

0.444

    

0.628

B

 

25

IV

1.66

V

0.213

IV

6.9

0.581

III

467

8.3

1.27

Qualified(V)

 

P

0.833

 

1.107

 

0.710

  

0.387

    

0.759

C

 

36

V

1.92

V

0.226

IV

6.9

1.2

IV

401

8.5

0.609

Pollution(V)

 

P

1.200

 

1.280

 

0.753

  

0.800

    

1.008

D

 

51

V

2.62

V

0.308

V

7

0.79

III

621

2.43

5.6

Pollution(V)

 

P

1.700

 

1.747

 

1.027

  

0.527

    

1.250

E

 

71

V

2.12

V

0.281

IV

7

0.468

II

582

2.02

5.9

Pollution(V)

 

P

2.367

 

1.413

 

0.937

  

0.312

    

1.257

  1. (Unit: mg/L). The standards in the table implement the IV water quality standards in the Environmental Quality Standards for Surface Water (GB3838-2002). The calculation and evaluation standards of the P-value and comprehensive pollution index are described above
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