Table 3 Elemental composition and surface area of rice straw (RS0) and humus-like substances (RS4, RS8, RS24, RS48, RS96, RS144)a.

From: Correlations and nonlinear partition of nonionic organic compounds by humus-like substances humificated from rice straw

Sorbent

C%

H%

N%

O%

Ash%

H/C

O/C

(O+N)/C

Asurf (m2/g)

Vtoal (cm3/g)

RS0

41.4 ± 0.6

5.66 ± 0.08

0.573 ± 0.015

41.3

11.1 ± 0.1

1.64

0.748

0.760

20

0.006

RS4

44.0 ± 0.2

5.13 ± 0.04

0.697 ± 0.010

35.6

14.7 ± 0.2

1.40

0.607

0.620

32

0.010

RS8

48.3 ± 0.5

4.95 ± 0.06

0.972 ± 0.005

30.8

15.0 ± 0.2

1.23

0.478

0.495

45

0.014

RS24

50.3 ± 0.1

4.83 ± 0.08

0.949 ± 0.020

28.5

15.4 ± 0.1

1.15

0.425

0.441

59

0.018

RS48

55.8 ± 0.3

4.33 ± 0.03

1.40 ± 0.01

19.0

19.5 ± 0.3

0.931

0.255

0.277

73

0.022

RS96

55.4 ± 0.5

4.30 ± 0.02

1.28 ± 0.02

20.0

19.0 ± 0.1

0.932

0.271

0.291

80

0.024

RS144

56.1 ± 0.6

4.31 ± 0.02

1.32 ± 0.01

19.6

18.7 ± 0.3

0.920

0.261

0.281

82

0.025

  1. aH/C, O/C, and (O + N)/C are molar ratios. Asurf and Vtoal are surface area and total pore volume calculated from CO2 isotherms by the nonlocal density fuctional theory (NLDFT).
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