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Table 2 Summary characteristics of stream sediment geochemical data and Se:Hg ratios in the lower Lom Basin (N = 55)

From: Regional geochemical baseline concentration of potentially toxic trace metals in the mineralized Lom Basin, East Cameroon: a tool for contamination assessment

Element Unit Minimum Median Mean Maximum MAD Std Dev Variance CV % Skewness
Sc µg/kg 2.11 129.97 211.75 1699.18 4.22 328.78 108,095.73 155.27 3.11
V µg/kg 53.57 85.96 963.14 12,333.20 5.20 2365.99 5,597,892.54 245.65 3.28
Cr µg/kg 13.58 39.18 763.93 10,052.57 1.26 1941.97 3,771,266.78 254.21 3.43
Mn mg/kg 224.12 319.00 441.56 1441.56 5.86 273.94 75,040.66 62.04 2.10
Fe mg/kg 12,109.19 22,678.94 28,325.12 159,319.95 6985.00 22,219.08 493,687,443.27 78.44 4.29
Co µg/kg 0.03 0.47 92.85 1308.38 0.14 256.17 65,625.13 275.90 3.41
Ni µg/kg 5.59 15.79 239.02 3125.54 0.19 607.61 369,194.94 254.21 3.35
Cu µg/kg 12.19 211.18 362.64 3946.64 0.04 680.27 462,768.04 187.59 3.95
Zn µg/kg 2.61 315.39 573.24 4657.72 18.39 1008.88 1,017,834.67 176.00 3.11
As µg/kg 0.35 22.66 99.40 1178.11 20.05 249.26 62,129.44 250.75 3.21
Se µg/kg 0.10 21.03 48.55 509.56 3.82 100.73 10,145.84 207.47 3.23
Cd µg/kg 1.30 2.48 2.65 7.85 5.37 0.98 0.97 37.10 3.69
Hg µg/kg 0.19 2.35 5.40 83.24 18.26 11.87 140.85 219.70 5.55
Pb µg/kg 7.25 47.64 151.59 2215.78 2168.13 365.78 133,795.98 241.30 4.10
pH 3.60 6.40 6.38 7.10 0.51 0.25 7.99 − 3.17
Se:Hg 0.04 2.70 2.31 7.49
  1. N number of sampling sites, MAD median absolute deviation, Std Dev standard deviation, CV coefficient of variation