Spatiotemporal Variation Characteristics of Water Pollution and the Cause of Pollution Formation in a Heavily Polluted River in the Upper Hai River

Figure 7

Relationships between the pollutant concentration and discharge at site G5: (a) COD_Cr; (b) BOD₅; (c) NH₃–N; (d) TP; (e) F⁻.

(a)

(b)

(c)

(d)

(e)