Region

Heavy Metals

Range Value (mg∙kg⁻¹)

Median (mg∙kg⁻¹)

Average (mg∙kg⁻¹)

Standard deviation (mg∙kg⁻¹)

Coefficient of variation (%)

A

As

109 - 245

146.5

161.75

53.81

38.4

Cd

1.64 - 3.35

2.49

2.49

0.636

29.5

B

As

144 - 150

147

147

2.45

2

Cd

2.49 - 2.94

2.61

2.68

0.19

8.7

C

As

129 - 160

141

143.33

12.76

10.9

Cd

2.02 - 2.40

2.09

2.17

0.165

9.3

D

As

117 - 148

132.5

132.5

11.1

9.7

Cd

1.85 - 2.12

2.01

2

0.097

5.6

Total

As

109 - 245

142.5

146.29

31.99

22.7

Cd

1.64 - 3.35

2.17

2.32

0.451

20.1