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Table 2 Metal(loid) concentrations found in the investigated plants, normalized to the slurries dry weight [units: mg kg−1dry weight]

From: Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream units

Plant

#1

#2

#3

#4

#5

#6

#7

#8

#9

#10

#11

#12

#13

#14

#15

Cr

5.6

6.8

12.6

7.9

3.8

6.7

3.2

2.6

5.4

2.9

3.9

3.7

8.6

56.7

85.4

Co

1.8

1.4

1.8

5.0

5.3

1.0

1.7

2.8

2.1

0.8

1.4

1.2

2.5

6.7

8.9

Ni

5.0

6.8

12.0

26.4

9.9

2.8

11.6

4.6

8.3

3.8

4.6

4.6

16.3

24.2

47.7

Se

1.4

n.d.

8.0

n.d.

7.6

0.9

0.3

2.9

8.6

2.4

5.3

n.d.

1.2

0.8

3.0

Rb

46.9

55.6

44.3

119.0

17.4

18.5

31.4

22.4

52.6

16.1

22.3

27.3

57.1

15.3

17.7

Sr

79.2

53.9

85.6

39.7

29.0

32.3

37.0

25.9

80.5

13.2

29.8

42.0

68.3

128.5

73.3

As

1.2

1.5

2.7

2.6

2.3

1.1

2.4

1.4

2.6

1.4

2.7

2.0

3.7

13.8

20.6

Mo

7.3

3.7

3.3

6.7

2.1

1.2

3.5

2.9

1.9

1.7

1.9

3.3

4.6

6.3

6.3

Cd

0.4

0.3

0.5

0.4

0.2

0.2

0.4

0.4

0.2

0.4

0.2

0.2

0.5

1.4

1.2

Sb

n.d.

0.1

n.d.

n.d.

n.d.

n.d.

0.1

0.1

0.2

0.1

0.2

0.2

n.d.

4.3

6.4

Ba

107.5

64.8

71.3

36.2

23.6

39.8

62.2

22.0

47.1

13.4

35.8

49.0

73.2

298.6

165.1

Pb

1.9

2.2

3.3

2.2

0.9

1.0

2.3

3.7

1.6

1.6

1.4

1.7

26.5

35.7

27.7

Bi

n.d.

n.d.

n.d.

n.d.

n.d.

n.d.

n.d.

0.1

1.7

n.d.

0.2

n.d.

0.1

2.5

4.2

U

0.1

0.2

0.2

0.1

0.1

0.2

0.1

0.1

0.3

0.1

0.1

0.4

0.1

5.3

2.9

Mn

247.2

202.2

392.3

8.6

248.1

361.7

279.5

225.3

501.6

179.4

220.0

371.0

263.8

322.1

370.7

Cu

81.3

28.1

55.7

6.2

30.5

41.7

26.9

73.9

57.9

23.7

24.4

54.6

285.4

192.3

192.4

Zn

259.9

140.2

627.0

15.7

196.6

363.5

213.2

219.7

283.1

134.9

138.9

263.5

524.5

893.5

647.4

Al

1462.5

2414.1

2592.7

618.5

528.4

777.1

647.1

1045.3

3130.0

782.1

1234.4

1845.1

2579.1

25,407.4

13,764.8

Fe

1952.4

2942.2

3217.1

2373.5

5190.3

1364.4

3384.2

2135.2

2484.7

2221.2

3933.1

3143.8

5228.9

23,877.5

31,760.2

  1. n.d. not detected