Table 1 Physico-chemical properties and heavy metal concentrations of soil and biochars.

From: Evaluation of biochars from different stock materials as carriers of bacterial strain for remediation of heavy metal-contaminated soil

 

Soil

Corn straw-derived biochar

Pig manure-derived biochar

pHa

7.4

7.5

8.1

OMb (%)

1.6

94.8

52.7

DOC (mg C L−1)

99.5

NDc

ND

Texture (%)

Sand

10.6

NDc

ND

Silt

31/2

ND

ND

Clay

58.2

ND

ND

CECd (cmol kg−1)

17.5

108.0

64.0

Ash (%)

ND

13.6

39.4

SBET e (m2 g−1)

ND

10.7

26.8

Mineral composition (g/kg)

N

2.06

9.26

31.55

P

3.02

5.95

51.70

K

16.51

7.46

17.37

S

0.03

0.98

1.54

Ca

4.15

7.29

78.10

Mg

6.84

2.38

15.78

Zn

0.06

—

—

Cu

0.02

—

—

Mn

0.44

0.45

0.62

Fe

27.99

5.25

24.47

Heavy metal concentration (mg kg−1)

Cd

Sample

2.1

4.6

3.7

Limitf

0.4

Cr

Sample

83.0

68.0

43.0

Limit

200

Hg

Sample

0.7

24.3

11.2

Limit

0.4

Pb

Sample

51.0

19.0

12.0

Limit

50.0

  1. apH, was measured using soil in 1:2.5 (w/v) 0.01 M CaCl2 solution. bOM, organic matter. cND, not determined. dCEC, cation exchange capacity. eSurface area determined by N2 adsorption using the Brunauer-Emmett-Teller (BET) method. fLimit established by Ministry of Environmental Protection of the People’s Republic of China for agricultural production and based on protection of human health (GB15618–2008).
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