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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Pedosphere. 2017 Aug 5;28(4):666–679. doi: 10.1016/S1002-0160(17)60440-5

TABLE III.

Heavy metal concentrations in agricultural soil samples (n = 175) collected from the study area

Metal District
 MALb)
(SEPAC,
1995)
Bannu (n = 24) DI Khana) (n = 37) Kohat (n = 47) Hangu (n = 39) Lakki Marwat (n = 28)
                   mg kg−1
Cu 16.8 ± 3.47c)
(12.2–27.9)d) 		15.6 ± 7.12
(6.93–37.2)		 11.1 ± 3.74
(4.68–27.8)		 11.9 ± 2.75
(7.03–18.5)		 13.4 ± 3.75
(8.20–22.3)		 100
Zn 122 ± 20.6
(41.8–145)		 134 ± 35.9
(91.7–217)		 109 ± 19.8
(76.9–170)		 119 ± 19.3
(82.1–175)		 107 ± 24.1
(79.9–176)		 300
Cr 42.8 ± 10.3
(0.93–55.1)		 27.0 ± 12.8
(7.25–67.5)		 18.1 ± 10.1
(3.00–40.4)		 25.7 ± 9.17
(6.45–39.6)		 32.4 ± 8.47
(10.7–47.2)		 250
Ni 39.3 ± 9.15
(7.00–51.9)		 26.7 ± 8.76
(12.5–46.3)		 21.2 ± 6.16
(5.88–42.2)		 22.8 ± 7.26
(11.6–36.6)		 30.4 ± 7.50
(17.4–44.3)		 60
Mn 285 ± 47.6
(65.7–317)		 270 ± 34.4
(192–339)		 258 ± 24.5
(158–294)		 265 ± 28.7
(215–307)		 266 ± 27.3
(214–318)		 NAe)
a)

Dera Ismail Khan.

b)

Maximum allowable limit.

c)

Means ± standard deviations.

d)

Values in the parentheses are the ranges.

e)

Not allotted.