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Table 5 Concentration of trace metals in sediments and its comparison with sediment quality guidelines (SQGs) in mg/kg dry wt

From: Distribution and ecological risk assessment of trace metals in surface sediments from Akaki River catchment and Aba Samuel reservoir, Central Ethiopia

Element

This study mean

This study range

SQG non polluted

SQG moderately polluted

SQG heavily polluted

Dry season

Rainy season

Dry season

Rainy season

Cd

2.6

2.7

2.1–2.9

2.5–3.1

–

–

> 6

Cr

27.2

24.4

16.2–43.7

18.3–29.4

< 25

25–75

> 75

Cu

5.1

3.4

1.6–15.3

2.1–6.2

< 25

25–50

> 50

Pb

153.8

124.2

124.4–256.4

101.4–133.7

< 40

40–60

> 60

Ni

23.6

20.6

15.6–36.2

14.6–24

< 20

20–50

> 50

Zn

25.8

20.2

4.0–110.0

4.8–38.2

< 90

90–200

> 200