International Journal of Marine Science 2016, Vol.6, No.48, 1-10
9
Table (5) Seasonal variation of total polycyclic aromatic hydrocarbons (ng/g) with mean in west Qurna 2 oil field.
Stations
Summer
Autumn
Winter
Spring
R. Mean
±SD
1
0.378
1.58
1.595
0.95
1.125
0.582
2
0.807
1.845
1.613
1.348
1.403
0.446
3
0.819
1.902
2.145
1.501
1.591
0.579
4
0.852
1.93
2.262
2.792
1.959
0.818
5
1.286
3.844
3.725
3.075
2.982
1.180
6
1.096
2.969
3.321
2.83
2.554
0.993
7
1.379
3.956
4.892
3.409
3.409
1.485
8
1.517
3.968
5.038
4.547
3.767
1.562
9
1.572
4.964
7.222
5.589
4.836
2.375
10
2.438
5.098
9.966
6.122
5.906
3.120
S. Mean
.12.1
512.3
11.44
512.3
-
-
R.Mean= regional mean, S. Mean= seasonal mean.
Table (6) Seasonal variation of TOC% and grain size in west Qurna-2 oil field.
Station
TOC%
Grain size
Summer
Autumn
Winter
Spring
Clay%
Silt%
Sand%
Clay%
1
0.256
0.558
1.116
1.118
2
70
28
2
2
0.358
0.651
1.162
1.162
1
41
58
1
3
0.461
1.023
1.441
1.213
3
68
29
3
4
0.666
1.038
1.581
1.415
1
47
52
1
5
0.923
1.829
1.813
1.668
1
76
23
1
6
0.82
1.162
1.674
1.649
2
32
66
2
7
0.974
1.953
1.891
1.668
1
42
57
1
8
1.025
2.046
2.000
1.800
1
56
43
1
9
1.179
2.093
2.418
1.876
1
39
60
1
10
1.282
2.511
2.511
2.445
2
73
25
2
Table (7) Comparison between the levels of PAHs (ng/g dry weight) in soil for the present study with the previously studies.
Conclusion
The PAHs compounds can be divided into two major groups (Low Molecular Weight (LMW) that consist of 2-3
fused rings, and High Molecular Weight(HMW) that consist of 4 and more fused rings. From the LMW/HMW,
phenanthrene/anthracene and benzo(a)anthracene/benzo(a)anthracene+ chrysene ratio, the source of PAHs
Studied Areas
PAHs (ng/g)
References
Shatt Al-Arab River &NWArabian Gulf
8.42- 70.56
Al-Saad (1995)
Al-Howaiza Marsh
0.1 – 145.8
Al-Khatib (2008)
Iraqi Coast Region
12.15-47.38
Al-Khion (2012)
Shatt Al-Arab River
4.318 – 28.48
Al-Hejuje (2014)
Shatt Al-Arab River
60.362-1.630
Al–Mahana (2015)
West Qurna-2 Oil field
0.378 -9.966
The present work
