Hassaan Mohamed A, Ragab Safaa, Sikaily Amany El, Nemr Ahmed El
Environment Division, National Institute of Oceanography and Fisheries (NIOF), Kayet Bey, P.O. 21556, Elanfoushy, Alexandria, Egypt.
Sci Rep. 2024 Mar 1;14(1):5082. doi: 10.1038/s41598-024-55339-4.
The aim of this work is to examine the levels, distribution, bases, and hazards of n-alkanes (n-C9 to n-C20) and PAHs in the seawater and sediments around oil production locations in the whole delta region. The variations in the levels of PAHs and n-alkanes in seawater and sediment of the Nile delta coast of the Mediterranean were investigated using GC-MS/MS. The Σn-alkanes residues ranged between 12.05 and 93.51 mg/L (mean: 50.45 ± 17.49 mg/L) and 4.70 to 84.03 µg/g (mean: 31.02 ± 27.995 µg/g) in seawater and sediments, respectively. Total PAHs concentrations ranged between 4.485 and 16.337 μg/L (average: 9.47 ± 3.69 μg/L) and 1.32 to 28.38 ng/g (average 8.61 ± 7.57 ng/g) in seawater and sediment samples, respectively. The CPI (carbon preference index) values fluctuated between 0.62 and 1.72 (seawater) and from 0.234 to 2.175 (sediment), proposing the variation sources of n-alkane in the studied area. PAHs concentrations were lower than the Effective Range Low (ERL) and Effective Range Median (ERM) levels. The Toxic Equivalent Quotient (TEQ) values oscillated between 0.002 and 6.84 ng/L and from 3.72 to 13.48 ng/g for the seawater and sediment samples, respectively. The Ant/(Ant + Phe) ratio in sediment and seawater samples indicated a pyrolytic source while the BaA/(BaA + Chry) ratio indicates petrogenic sources in most of the studied stations.
这项工作的目的是研究整个三角洲地区石油生产地点周边海水和沉积物中正构烷烃（n-C9至n-C20）和多环芳烃的含量、分布、来源及危害。采用气相色谱-串联质谱法（GC-MS/MS）研究了地中海尼罗河三角洲海岸海水和沉积物中多环芳烃和正构烷烃含量的变化。海水和沉积物中正构烷烃残留量分别在12.05至93.51毫克/升（均值：50.45±17.49毫克/升）和4.70至84.03微克/克（均值：31.02±27.995微克/克）之间。海水和沉积物样品中多环芳烃总浓度分别在4.485至16.337微克/升（平均：9.47±3.69微克/升）和1.32至28.38纳克/克（平均8.61±7.57纳克/克）之间。碳偏好指数（CPI）值在0.62至1.72（海水）和0.234至2.175（沉积物）之间波动，表明研究区域中正构烷烃的来源存在差异。多环芳烃浓度低于效应范围低值（ERL）和效应范围中值（ERM）水平。海水和沉积物样品的毒性当量商（TEQ）值分别在0.002至6.84纳克/升和3.72至13.48纳克/克之间波动。沉积物和海水样品中的蒽/（蒽+菲）比值表明存在热解来源，而苯并[a]蒽/（苯并[a]蒽+ Chrys）比值表明在大多数研究站点存在成岩来源。
