Treatment

Heavy metals recommendation limits in compost Brinton (2000)

Heavy metal (mg∙kg⁻¹)

T1

T2

T3

T4

T5

Germany

(mg∙kg⁻¹)

USA (EU-range)

(mg∙kg⁻¹)

Cu

13.92 ± 1.55^a

14.71 ± 0.83^a

13.32 ± 0.69^a

15.57 ± 1.8^a

13.75 ± 1.07^a

3 - 20

70 - 600

Hg

0.3 ± 0.02^a

0.23 ± 0.04^a

0.24 ± 0.03^a

0.24 ± 0.03^a

0.23 ± 0.02^a

0.05 - 0.40

0.7 - 10

Cr

16.07 ± 0.49^ab

15.13 ± 2.03^a

15.7 ± 2.23^a

17.83 ± 3.69^b

17.03 ± 0.6^b

5 - 100

70 - 200

Cd

1.05 ± 0.2^a

1.06 ± 0.17^a

1.02 ± 0.18^a

1.11 ± 0.25^b

1.03 ± 0.2^a

0.3 - 7

0.7 - 10

Pb

19.15 ± 1.68^b

19.35 ± 5.34^b

18.87 ± 2.94^ab

17.39 ± 2.12^a

19.42 ± 0.98^b

12 - 100

70 - 1000

Ni

14.92 ± 0.5^ab

14.55 ± 0.98^ab

16.06 ± 3.33^b

15.92 ± 4.81^b

12.81 ± 2.19^a

4 - 50

20 - 200

Zn

45.74 ± 2.68^a

44.76 ± 2.65^a

44.68 ± 3.47^a

46.49 ± 2.29^ab

48.3 ± 2.37^b

14 - 125

210 - 400