Table 2 Selected chemical properties of the unmodified and modified biochars.

From: Mechanisms of Cd immobilization in contaminated calcareous soils with different textural classes treated by acid- and base-modified biochars

 

*R

RA

RB

S

SA

SB

pH (1:20)

10.3

2.90

9.80

11.0

2.80

10.1

EC (1:20) (dS m− 1)

1.17

0.29

0.74

4.28

0.43

0.72

CEC (cmol+ kg− 1)

15.33

42.00

19.70

18.94

60.0

25.0

C (%)

50.0

45.0

53.0

31.8

28.00

35.0

H (%)

1.06

1.10

1.08

0.80

1.02

1.10

N (%)

1.10

2.02

0.83

1.57

2.68

1.02

P (%)

0.09

0.05

0.08

0.25

0.20

0.22

Cd (mg kg− 1)

Nd

Nd

Nd

Nd

Nd

Nd

Moisture content (%)

2.37

2.00

2.10

1.82

1.85

1.90

Ash content (%)

44.80

30.00

33.00

60.00

41.0

49.0

H: C mole ratio

0.25

0.29

0.24

0.30

0.44

0.38

O + S: C mole ratio

0.01

0.33

0.14

0.09

0.68

0.25

  1. *R, rice husk biochar; RA, rice husk biochar modified by HNO3; RB, rice husk biochar modified by NaOH; S, sheep manure biochar; SA, sheep manure biochar modified by HNO3; SB, sheep manure biochar modified by NaOH CEC, cation exchange capacity; EC, electrical conductivity; Nd, non-detectable.
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