Pb

Cd

Hg

Cu

Zn

Testing ground (n = 10)

Mean ± SD

320 ± 76

0.68 ± 0.14

1.57 ± 0.70

102 ± 25

316 ± 47

(min-max)

(229 - 436)

(0.55 - 0.99)

(0.97 - 3.3)

(81 - 156)

(231 - 367)

IDF Regional Thresholds [27]

53.7

0.51

0.32

28

88

Soil threshold values receiving sludge (decree n˚ 97-1133)

100

2

1

100

300

Chinese regulatory values [28]

80

0.3 - 0.6

0.3 - 1

50 - 200

200 - 300

Dutch regulatory values [28]

530

13

36

190

720

German regulatory values [28]

1000

5

5

200

600