Table 6 Heavy metal s mean concentrations (mg/kg) in soils comparison of similar studies with the present work.

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

Study area

As

Cr

Cu

Ni

Pb

Zn

Cited Reference No

Iran

NA

0.028

1.146

1.150

1.458

1.679

89

Pakistan

NA

163.7

NA

11.603

1015.7

402.4

88

India

NA

8.29

13.52

18.78

12.52

NA

91

Iran

6.2

60

97

84

43

165

90

India

3.2

203.3

253.3

73.1

68.6

229.6

Present study area

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