Agriculture Reference
In-Depth Information
2010
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
SB
5.85
0.53
1.79
3.61
0.46
2.21
4.17
2.26
1.65
3.05
1.72
2.79
TeCDD
5.53
0.66
2.06
5.73
0.51
4.33
4.96
3.06
2.61
6.24
2.71
1.75
PeCDD
HxCDD
7.45
1.15
3.73
6.40
0.94
4.89
4.30
4.00
3.64
5.71
2.19
6.02
4.60
2.52
5.30
5.05
3.19
6.16
5.47
5.28
4.45
5.41
2.92
5.14
HpCDD
14.2
83.4
56.8
21.7
78.8
49.7
34.9
47.7
52.8
32.1
20.8
29.4
OCDD
16.9
3.06
9.50
17.9
11.3
9.35
14.6
7.86
13.1
15.9
10.8
20.3
TeCDF
14.1
2.35
6.26
12.8
1.37
6.45
8.24
6.06
6.99
8.01
2.71
12.5
PeCDF
15.5
2.37
6.92
13.5
1.40
7.20
9.25
8.17
5.75
8.88
5.65
9.26
HxCDF
11.4
1.86
5.33
9.01
1.20
6.37
8.57
11.7
5.54
9.20
13.6
8.68
HpCDF
4.49
2.16
2.26
4.25
0.82
3.38
5.62
3.84
3.44
5.58
36.9
4.21
OCDF
Table 5. PCDD/Fs homologue distribution in soil of 2010, %.
TeCDD PeCDD HxCDD
HpCDD
OCDD TeCDF PeCDF HxCDF HpCDF OCDF
Fly ash
3.57
6.76
10.76
7.19
3.39
18.48
11.39
20.51
14.71
3.24
Stack gas 3.02
6.99
5.44
3.93
2.31
20.33
17.20
23.64
13.40
3.73
Table 6. PCDD/Fs homologue distribution of fly ash and stack gas, %.
60
2007 Av
2008 Av
2009 Av
2010 Av
MW I Av
50
40
20
10
0
Fig. 7. PCDD/Fs Homologue pattern of soil and MWI samples (Av, Average).
Principal component analysis (PCA) is used to estimate the similarity and difference of
homologue pattern between soil and the presumed source (MWI), as shown in Fig.8.
Accumulation information of component 1 and component 2 is up to 77.98%, means these
two components can well represent the total information of all samples. Component 1
mainly depends on OCDD, HxCDF and HxDD, as well as component 2 is related to OCDF
and HpCDD. The sites of fly ash and stack gas locate on the right of the PCA score plot,
separates from soil samples, which indicates a clear difference between MWI emission and
soils in the homologue distribution. Overall, 2007 survey soils are mainly located top left,
2008 soils are mainly in bottom, 2009 and 2010 year soils are mainly in the centre. The
groups of each year illuminate homologue patterns in soil change with time, and show a
close relation in the soils collected 2009 and 2010. Considering the average distance between
