Elements concentration (μg/g)

Ca

Cu

Fe

Pb

Zn

Cr

Cd

Mg

Ni

Average

1490

6.8

60

11

25

<0.1

<0.1

191

<0.04

Maximum

4006

16

387

27

65

<0.1

<0.1

213

<0.04

Minimum

132

2.3

0.76

9

1.7

<0.1

<0.1

97

<0.04