Skip to main content

Table 2 Mean concentrations and standard deviations of trace metals in LAR sediment

From: Little Akaki River sediment enrichment with heavy metals, pollution load and potential ecological risks in downstream, Central Ethiopia

Sample site code Mean and standard deviation of heavy metals concentrations in sediment (mg/kg)
Zn Cr Cd Pb
S1 82.24 ± 0.013 2.19 ± 0.014 4.160 ± 0.0001 37.44 ± 0.012
S2 150 ± 0.001 30.72 ± 0.001 4.12 ± 0.001 41.48 ± 0.008
S3 167.2 ± 0.001 440.80 ± 0.003 3.04 ± 0.001 30.92 ± 0.018
S4 159.6 ± 0.001 56.6 ± 0.001 2.92 ± 0.001 596.4 ± 0.066
S5 170.49 ± 0.003 52.17 ± 0.002 2.09 ± 0.001 61.15 ± 0.041
S6 92.84 ± 0.024 48.84 ± 0.009 2.60 ± 0.001 372.4 ± 0.011
S7 78.96 ± 0.021 36.6 ± 0.008 2.44 ± 0.001 31.12 ± 0.014
S8 228 ± 0.001 174.8 ± 0.0001 4.04 ± 0.001 46.28 ± 0.009
S9 235.2 ± 0.001 5.92 ± 0.004 3.0 ± 0.001 43.32 ± 0.011
S10 118.64 ± 0.009 246.4 ± 0.001 2.96 ± 0.001 36.24 ± 0.011
Min 78.96 2.19 2.09 30.92
Max 235.2 440.8 4.16 596.4
Range 78.96–235.2 2.19–440.8 2.09–4.16 30.92–596.40
Overall Mean 148.28 109.51 3.14 129.68
USEPA SQGsa
 Non -polluted
 < 90  < 25  < 40
 Moderately polluted 90–200 25–50 40–60
 Heavily polluted  > 200  > 50  > 6  > 60
World river sediment average valueb 303 126 1.4 230.75
  1. aUSEPA SQGs (Giesy and Hoke 1990); bWorld river sediment average value adopted from (Martin and Meybeck 1979)