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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)