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Table 2 Heavy metal content of soil obtained from soil of local mining sites of Zamfara State, Nigeria

From: Physicochemical and molecular characterization of heavy metal–tolerant bacteria isolated from soil of mining sites in Nigeria

Metal (ppm) Sampling site
Site 1 Site 2 Site 3 Site 4 Site 5 (Control) MPL in Soil (UNEP, 2013)
Chromium 1.97 ± 0.002a 9.85 ± 0.004b 5.87 ± 0.23b,c 20.95 ± 1.80d 0.75 ± 0.000a 100
Lead 4.75 ± 0.32a,b 2.25 ± 0.002b 59.01 ± 3.23c 7.02 ± 0.044a 0.50 ± 0.002d 60
Cadmium 1.15 ± 0.002a 1.64 ± 0.004a 4.71 ± 0.54b 1.20 ± 0.004a 1.10 ± 0.01a 1.0
Copper 1.42 ± 0.003a 1.21 ± 0.001a 21.2 ± 2.76b 33.0 ± 3.40c 1.10 ± 0.022a 100
  1. Key: MPL maximum permissible limit, ppm parts per million. Note: mean ± standard deviation
  2. a,b,c,dValues with common  superscripts in the same row do not differ (p ≤ 0.05)