Table 5 Descriptive statistical summary of heavy metal concentrations in soils and Reference values.

From: Spatial distribution, sources and health risk assessment of heavy metals in topsoil around oil and natural gas drilling sites, Andhra Pradesh, India

Parameters

As (mg/kg)

Cr (mg/kg)

Cu (mg/kg)

Ni (mg/kg)

Pb (mg/kg)

Zn (mg/kg)

Mean

3.2

203.3

253.3

73.1

68.6

229.6

Minimum

0.10

2.9

6.8

14.2

9.0

60.7

Maximum

15.9

707.1

2324.1

234.0

1664.5

961.8

Std. Deviation

4.0

108.1

347.4

22.8

153.0

137.6

Skewness

1.8

2.3

3.4

2.5

8.6

2.5

Kurtosis

1.8

7.0

13.4

20.2

87.3

9.9

Reference value57

1.5

35.0

25.0

20.0

20.0

71.0

Reference value82

12

64

63

45

70

250

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