ارزیابی آلودگی، دسترسی و تجمع زیستی فلزات سنگین در رسوب و صدف تیغیSolen dactylus در خورهای غرب و شرق استان هرمزگان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی دریا، دانشکده علوم و فنون دریایی، دانشگاه هرمزگان، بندرعباس، ایران

2 گروه شیلات، دانشکده علوم و فنون دریایی، دانشگاه هرمزگان، بندرعباس، ایران

10.22034/AEJ.2021.288893.2547

چکیده

هدف این مطالعه تعیین غلظت فلزات سنگین در رسوبات و صدف دوکفه ای Solen dactylus در خورهای پوشیده از درختان مانگرو غرب (خور خمیر) و شرق (خور شهرنو-جاسک) استان هرمزگان و هم چنین ارزیابی آلودگی، تجمع زیستی و تعیین سمیت فلزات سنگین (آهن، نیکل، مس و سرب)، در این مناطق می باشد. رسوبات بستر جهت تعیین دانه بندی، کربن آلی، مواد آلی، غلظت کل، غلظت جزئی و دسترسی زیستی فلزات، مورد مطالعه و بررسی قرار گرفت. نتایج نشان داد که عوامل محیطی مانند مواد آلی و اندازه دانه بندی رسوبات بر توزیع فلزات سنگین تاثیر ‌گذارند. با توجه به نتایج به دست آمده هیچ اختلاف معنی داری در تجمع فلزات در رسوبات بین دو ایستگاه مشاهده نگردید (0/05<P). نتایج شاخص های فاکتور آلودگی و غنی شدگی نشان دادکه فلزات نیکل و سرب دارای درجه آلودگی و غنی شدگی متوسط می‌ باشند. شکل ژئوشیمیایی فلزات مورد مطالعه بیانگر دسترسی زیستی بیش تر فلزات مس و سرب بود. شاخص کد ارزیابی ریسک و جدول SQRT نشانگر درجه ریسک بالا برای فلز مس در خور شهرنو و فلز سرب در خور خمیر بوده و هر دو فلز بالاتر از حد آستانه (TEL) برای صدف ها در منطقه قرار دارد. نتایج فاکتور تجمع زیستی صدف S. dactylus نشان داد که در هر دو منطقه، تجمع فلز مس بیش تر از بقیه فلزات مورد مطالعه می باشد. به طور کلی مطالعه حاضر نشان داد که رسوبات این مناطق از نظر فلزات مس و سرب  آلوده کننده می باشند. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of pollution, bioavailability and bioaccumulation of heavy metals in sediment and razor clam, Solen dactylus in the western and eastern estuaries of Hormozgan province

نویسندگان [English]

  • Asieh Soleimanirad 1
  • Mohammadreza Taherizadeh 1
  • Mohsen Safaie 2
  • Narges Amrollahi Biuki 1
1 Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
2 Department of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
چکیده [English]

The aim of this study was to determine the concentration of heavy metals in the sediments and the bivalve molluscs, Solen dactylus, in the estuaries covered by mangrove trees of west (Khamir estuary) and east (Shahrno estuary-Jask) of Hormozgan province and also to assess the pollution, bioaccumulation and toxicity of heavy metals (Fe, Ni, Cu and Pb), in these areas. Sediments were studied to determine the grain size, organic carbon, organic matter, total and partial concentration and bioavailability of metals. The results showed that the environmental factors such as organic matter and grain size of sediments affect the distribution of heavy metals. According to the results, there was no significant difference between the sediments of two stations in the accumulation of metals (P>0.05). contamination and enrichment factors for Ni and Pb showed a moderate degree of contamination and enrichment. The geochemical speciation of the studied metals indicated more bioavailability for Cu and Pb. The Risk Assessment Code and the screening quick reference table (SQRT) indicate the high risk in Cu for Shahrno estuary and in Pb for Khamir estuary, and both metals are above the threshold effect level (TEL) for the clam in the area. The results of S. dactylus's bioaccumulation factor showed that Cu accumulated more than other metals in both regions. In general, the present study showed that the sediments of the studied areas are contaminating in terms of Cu and Pb.

کلیدواژه‌ها [English]

  • Sequential extraction
  • Partial concentration
  • Pollution assessment
  • Metal toxicity
  • Mangrove

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فصلنامه محیط زیست جانوری
دوره 14، شماره 2
تیر 1401
صفحه 335-346

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