. 2019 Dec 19;9:19469. doi: 10.1038/s41598-019-56058-x

Table 2.

Physico-chemical parameters measured in the least faecally contaminated site (AG – Aas, Grytelandsbekken rural creek) and the most faecally contaminated site (SB – Ski, Blåveisbekken urban stream). Values in mg/l, and mS/m for EC.

Parameter	Values min – max mean
Chemical oxygen demand (COD)	9–38 24	6–129 28
Total suspended solids (TSS)	5.6–92.3 17.7	6.1–1350 168
Total dissolved solids (TDS)	107–225 150	120–316 177
Total organic carbon (TOC)	3.1–12.4 7.6	3–9 5.9
Dissolved organic carbon (DOC)	3–12 7	3–8.4 5.6
Total phosphorus (TP)	0.017–0.228 0.083	0.028–0.71 0.114
Phosphate phosphorus (PO₄-P)	0.013–0.094 0.032	0.004–0.112 0.036
Total nitrogen (TN)	2.56–9.66 5.08	1.5–6.36 3.13
Ammonium nitrogen (NH₄-N)	0.004–0.899 0.123	0.026–2.17 0.307
Nitrite nitrogen (NO₂-N)	0.008–0.068 0.03	0.005–0.183 0.041
Nitrate nitrogen (NO₃-N)	1.84–4.37 2.72	1.21–2.02 1.54
Electrical conductivity (EC)	11.8–31.6 19.6	18–40.7 27.1
pH	6.9–7.7	7.4–8.4

Parameter

Values min – max
mean

Chemical oxygen demand (COD)

9–38

6–129

Total suspended solids (TSS)

5.6–92.3

17.7

6.1–1350

168

Total dissolved solids (TDS)

107–225

150

120–316

177

Total organic carbon (TOC)

3.1–12.4

7.6

3–9

5.9

Dissolved organic carbon (DOC)

3–12

3–8.4

5.6

Total phosphorus (TP)

0.017–0.228

0.083

0.028–0.71

0.114

Phosphate phosphorus (PO₄-P)

0.013–0.094

0.032

0.004–0.112

0.036

Total nitrogen (TN)

2.56–9.66

5.08

1.5–6.36

3.13

Ammonium nitrogen (NH₄-N)

0.004–0.899

0.123

0.026–2.17

0.307

Nitrite nitrogen (NO₂-N)

0.008–0.068

0.03

0.005–0.183

0.041

Nitrate nitrogen (NO₃-N)

1.84–4.37

2.72

1.21–2.02

1.54

Electrical conductivity (EC)

11.8–31.6

19.6

18–40.7

27.1

6.9–7.7

7.4–8.4