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dominant homologue in MWI samples (Table 6), so HxCDF is chose to investigate the
isomer profile. Table 7 to 10 are HxCDFs isomer distribution in soil samples, stack gas and
fly ash, respectively. There are 16 isomers of HxCDF besides 4 toxic species whose 2,3,7,8
position are occupied by chlorine atom. 124678-HxCDF is the same peak with 134678-
HXCDF in gas-chromatographic elution, 123679-HxCDF is also the same peak with 123469-
HxCDF, so these two isomers are not assigned; meanwhile, 123489-HxCDF is difficultly
separated from 123789-HCDF, so 123489-HxCDF is not assigned too. Fig.9 shows the
average of HxCDF isomer pattern in different surveys, the dominated species is 134678-
HxCDF, as well as, 123467-HxCDF, 123478-HxCDF and 123678-HxCDF. The average isomer
profile among soil and MWI emission (Fig.9) is more similar than the average homologue
pattern (Fig.7).
Position S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 SB
123468 6.06 7.43 7.97 7.75 9.64 11.71 9.60 10.7 5.95 9.14 11.08 8.02
134678 44.0 21.62 33.2 32.43 37.0 18.8 28.1 33.3 21.9 32.8 9.79 34.4
134679 ND ND 1.98 3.91 1.23 0.90 ND ND ND ND 7.75 ND
124679 7.88 2.16 ND ND 7.04 6.50 5.83 1.26 2.22 6.04 ND 5.09
124689 0.79 1.35 ND ND ND 1.67 ND 1.93 ND ND ND 0.16
123467 7.37 7.92 ND 9.56 6.22 17.6 12.9 10.2 8.58 11.0 15.3 16.2
123478 4.28 32.5 13.0 15.7 11.8 ND 13.4 9.48 30.2 10.9 19.5 15.6
123678 5.64 13.3 14.1 15.1 10.5 10.5 9.89 5.30 11.6 10.2 9.43 ND
123479 ND ND ND ND ND 8.37 ND ND ND ND ND ND
123469 ND ND ND ND ND ND ND 5.92 ND ND ND ND
123689 8.33 5.98 ND 2.12 5.90 7.31 6.27 5.92 5.59 ND 9.32 5.59
234678 9.54 ND 9.36 11.1 8.21 5.06 8.67 8.15 10.6 9.08 17.3 7.91
123789 6.09 7.67 20.3 2.38 2.48 11.6 5.34 7.89 3.38 10.9 ND
7.07
Table 7. HxCDF isomer distribution of 2007 year soil, %.
Position
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
SB
123468
11.8
7.30
10.5
13.6
11.0
11.0
11.5
10.9
8.66
9.94
10.4
13.1
134678
29.5
20.8
26.6
33.3
35.3
26.9
29.1
28.9
27.7
24.9
26.3
30.3
134679
ND
0.96
1.73
6.54
2.10
1.87
1.97
1.66
1.08
1.46
2.20
2.79
124679
6.53
3.37
4.38
6.27
ND
5.48
4.06
4.07
4.18
2.19
4.23
3.42
124689
1.56
1.74
2.03
ND
2.73
1.61
0.39
0.46
2.05
2.03
3.51
1.18
123467
12.1
9.33
12.8
13.8
4.99
12.6
11.9
13.2
9.66
14.8
9.44
11.8
123478
11.2
22.4
7.16
ND
8.75
10.7
13.4
13.0
4.23
13.1
9.48
13.5
123678
11.0
11.2
10.5
11.3
9.89
10.8
10.9
11.5
8.63
9.42
10.3
11.0
123479
2.89
2.97
3.56
ND
6.10
1.98
3.27
3.34
5.97
4.75
3.58
2.78
123469
1.23
1.55
1.44
2.61
ND
1.51
1.19
1.53
2.55
0.85
0.61
1.42
123689
2.97
4.17
5.00
ND
ND
4.31
3.48
1.06
7.71
4.42
4.35
1.95
234678
6.53
9.52
7.32
12.6
12.7
6.74
5.67
6.61
12.0
9.20
10.4
4.41
123789
2.78
4.68
6.98
ND
6.50
4.58
3.29
3.83
5.58
2.97
5.21
2.47
Table 8. HxCDF isomer distribution of 2008 year soil, %.
