Trace elements

Total average valuesa

Local background limit valuesa

UCCb

Chinac

Japan

Canada

Cr

79

89.8

35

200

-

75

Co

16

9.9

11.60

40

50

250

Ni

181

74.8

18.60

50

100

100

Cu

193

81.9

14.30

100

125

100

Zn

37

42.92

52

52

250

400

As

4

6.75

2

25

-

200