دراسة تراكم الملوثات العضوية (PAHs, PCBs) في الطحلب البحري Ulva fasciata في شاطئ اللاذقية وجبلة
Abstract
تهدف هذه الدراسة إلى إلقاء الضوء على قدرة الطحلب البحري Ulva fasciata على تجميع بعض الملوثات العضوية (الفحوم الهيدروجينية العطرية PAHs ومركبات ثنائي فينيل متعدد الكلور PCBs). جمعت عينات الطحالب من ثلاثة مواقع على الشاطئ السوري (الدراسات والكورنيش الجنوبي في اللاذقية وكورنيش جبلة) خلال عام 2011.
أظهرت نتائج الدراسة قدرة الطحلب المدروس على تجميع مركبات الـ PAHs بشكل ملحوظ حيث تراوحت تراكيزها بين (72.7 – 30.52 ng/g dw)، بينما كان تركيز مركبات الـ PCBs أقل حيث تراوحت بين
(24.01 – 6.00 ng/g dw).
تم رصد التركيز الأعظمي لمركبات الـ PAHs في منطقة الدراسات، بينما سجل أعلى تركيز لمركبات
الـ PCBs في كورنيش جبلة. كانت قيم لوغاريتم معامل التركيز الحيوي BCF) (logللمركبات العطرية الحاوية على ثلاث حلقات عطرية قريبة من قيم لوغاريتم معامل التوزع بين الاوكتانول والماء (log Kow) على خلاف المركبات الحاوية على عدد حلقات أعلى، حيث كانت BCF log أقل و بشكل واضح من قيم log Kow الموافقة. ارتفعت قيم BCF log بشكل عام مع ازدياد درجة الكلورة (6-2 ذرات كلور), بينما لم ترصد زيادة بقيم BCF log مع ازدياد درجة الكلورة للمركبات الحاوية على 7 و 8 ذرات كلور.
The purpose of this study is to highlight on the ability of the alga Ulva fasciata to accumulate some organic pollutants (polycyclic aromatic hydrocarbons :PAHS, polychlorinated biphenyls: PCBs). The samples were collected from three sites at the Syrian coast during 2011.
The result of this study revealed the ability of alga to accumulate significantly the PAHs and their concentrations ranged from 30.52 to 72.7 ng/g dw, While the PCBs concentrations were less, it ranged between 6.00 and 24.01 ng/g dw.
The highest concentration of PAHs was observed at the Dirasat site, while the highest concentration of the PCBs found at the Cornish of Jablah. The logarithm bioconcentration factors (log BCF) of the aromatic compounds with three aromatic rings were close to the logarithm octanol/water partitioning coefficients (log Kow ), unlike the compounds with higher rings, where log BCF were obviously less than corresponding log Kow.
The log BCF values of PCBs increased with increasing chlorine atoms (2 - 6 atoms) , while no increasing was observed for components that contain 7 to 8 chlorine atoms
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