International Journal of Marine Science 2016, Vol.6, No.48, 1-10
7
hydrocarbon compound input to environment with run off during winter season, elevated levels of them during
winter may be attributed to their in precipitation which is significantly higher in winter than in summer. In
addition during winter, because of lowering in temperature the evaporation rate will decrease, and causes
biodegradation lower rate (Al-Khatib, 2008).
The effect of TOC and grain size on the PAHs concentrations in soil was investigated in the present study. The %
TOC and grain size of the recent soil are given in Table 6. The % TOC mean values ranged from 0.762% in station
1 to 2.187% in station 10. The variation in % TOC between the stations could be due to different organic matter
sources and sedimentary environments. A significant positive correlation between TOC% and total PAHs in the
soil were found at this study (r=0.888, P<0.01). This result was in agreement with (Al–Mahana, 2015), (Al-Saad
et al., 2016) and (Farid et al., 2016) the importance of sedimentary organic matter on the PAHs partitioning in
sediments had been well documented by Chiou et al. (1998). They found that the high partitioning of PAHs to
sedimentary organic matter was mainly due to the significant aromatic fraction of the organic matter. They
considered the sedimentary organic matter as a natural “heterogeneous polymer” where PAHs interact more
favorably with the aromatic regions. Otherwise there were non-significant correlation between the PAHs in soil
and each of the soil texture compounds (sand, silt and clay).
Table (3) Regional concentration of polycyclic aromatic hydrocarbons (ng/g)dry weight in soil of west Qurna- 2 oil field during
winter season 2015.
PAHs compounds
Station1
2
3
4
5
6
7
8
9
10
Naphthalene
0.013
0.018
0.013
0.035
0.025
0.016
0.011
0.019
0.012
0.026
Acenaphthylene
0.031
0.035
0.024
0.021
0.060
0.058
0.078
0.169
0.120
0.147
Acenaphene
0.007
0.021
0.019
0.014
0.076
0.026
0.040
0.074
0.135
0.157
Fluorene
0.063
0.054
0.050
0.050
0.140
0.144
0.189
0.438
0.263
0.312
Phenanthrene
0.153
0.130
0.228
0.290
0.308
0.360
0.360
0.500
0.548
1.223
Anthracene
0.143
0.170
0.162
0.217
0.173
0.196
0.381
0.524
0.355
1.082
Fluoranthene
0.114
0.132
0.242
0.184
0.322
0.338
0.646
0.581
0.769
1.044
Pyrene
0.417
0.293
0.161
0.193
0.517
0.216
0.901
0.523
0.801
1.486
Benzo(a)anthracene
0.086
0.052
0.125
0.132
0.138
0.197
0.368
0.277
0.434
0.500
Chrysene
0.031
0.025
0.044
0.056
0.107
0.088
0.095
0.158
0.234
0.285
Benzo(b)fluoranthene
0.019
0.015
0.050
0.114
0.041
0.096
0.128
0.094
0.214
0.160
Benzo(k)fluoranthene
0.074
0.113
0.177
0.035
0.263
0.205
0.285
0.214
0.546
0.532
Benzo(a)pyrene
0.053
0.112
0.290
0.163
0.197
0.158
0.557
0.405
0.525
0.655
Carbazole
0.219
0.196
0.318
0.316
0.682
0.648
0.444
0.624
1.640
1.498
Indo(1,2,3-cd)pyrene
0.021
0.038
0.053
0.112
0.121
0.050
0.067
0.119
0.205
0.197
Dibenzo anthracene
0.069
0.147
0.123
0.211
0.425
0.173
0.149
0.130
0.223
0.440
Benzo(g,h,i)perylene
0.072
0.055
0.058
0.111
0.120
0.343
0.183
0.181
0.191
0.213
Total
1.595
1.613
2.145
2.262
3.725
3.321
4.892
5.038
7.222
9.966
Fluoranthen/Pyrene
0.275
0.450
1.502
0.951
0.623
1.561
0.717
1.111
0.960
0.702
Phen/Ant
1.063
0.763
1.405
1.334
1.782
1.839
0.945
0.954
1.542
1.129
LMW/HMW
0.494
0.211
0.528
0.562
0.423
0.524
0.537
0.846
0.439
0.669
Ant/(Ant+Phen)
0.484
0.567
0.415
0.428
0.359
0.352
0.513
0.511
0.393
0.469
BaA/(BaA+Chry)
0.734
0.678
0.736
0.701
0.563
0.689
0.793
0.636
0.650
0.636
InP/(InP+BghiP)
0.230
0.406
0.480
0.503
0.502
0.129
0.267
0.396
0.517
0.481
