بررسی غلظت فلزات در رسوبات سطحی دریای خزر در امتداد نیم‌خط‌های کپورچال، بندرانزلی و کیاشهر

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی محیط زیست، دانشکده مهندسی منابع طبیعی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

3 استادیار پژوهشکده علوم زمین، سازمان زمین شناسی و اکتشافات معدنی کشور

چکیده

در این مطالعه به‌منظور بررسی پراکنش و تعیین منشاء فلزات سرب، مس، روی، نیکل، کروم و وانادیم در رسوبات سطحی سواحل جنوب غربی دریای خزر، نمونه‌برداری از رسوبات سطحی سه نیم خط کپورچال، بندرانزلی و کیاشهر در خرداد ماه 1391 انجام شد. غلظت فلزات توسط دستگاه ICP-OES تعیین شد. منشاء فلزات در منطقه طبیعی و ناشی از فرسایش خاک و سنگ‌های حوضه آبریز رودخانه‌های ورودی به دریا به‌دست آمد. میانگین غلظت کلی فلزات در امتداد نیم‌خط‌های مورد مطالعه با افزایش فاصله از ساحل، افزایش معنی‌داری را نشان دادند که می‌تواند ناشی از انتقال رسوبات با توجه به شیب ساحل در امتداد نیم‌خط‌ها باشد. همچنین میانگین غلظت کلی فلزات در امتداد ساحل، افزایش معنی‌داری را درنیم خط بندرانزلی نشان دادند، که از دلایل آن می‌توان به‌وجود تالاب انزلی با توجه به تعدد رودخانه‌های ورودی به آن و مجاری خروجی از آن به دریا اشاره کرد. همچنین غلظت کلی فلزات در رسوبات سطحی منطقه در مقایسه با استانداردهای جهانی SQGs و NOAA پایین‌تر بود. کد ارزیابی ریسک نیز برای فلزات مورد مطالعه، عدم ریسک و فقط برای سرب و مس، ریسک پایین را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Concentrations of Different Metals in the Caspian Sea Coastal Surface Sediments along the Three Transects of Kapourchal, Bandar-Anzali, and Kiashahr

نویسندگان [English]

  • sayed javad Hashemi 1
  • Alireza Riahi Bakhtiari 2
  • Razie Lak 3
3 Assistance Prof, Geological Survey of Iran, Research Institute for Earth Sciences, Geological Survey of Iran
چکیده [English]

This study was conducted to determine the origin and distribution of the lead, copper, zinc, nickel, chromium, and vanadium metals in the surface sediments of the southwestern coasts of the Caspian Sea. Surface sediment samples were collected from the three transects of Kapourchal, Bandar-Anzali, and Kiashahr at three different depths of 10, 20, and 50 m. Metal concentrations were determined by ICP-OES. The metals in these areas were identified to originate from such natural sources as rock weathering and soil erosion transported by rivers into the sea. The mean total concentrations of the metals along the three transects showed significant increases with increasing distance from the shore, which might be due to the transportation of sediments as a result of increasing slope along the sampling transects. The same trend was observed in the samples taken from the coastal areas along Bandar-Anzali, which was could be due to the wetlands in the region and the multitude of rivers flowing into this wetland which eventually carried the sediments into the sea. Results revealed that the total metal concentrations in the region were below the SQGs and NOAA standards. Finally, risk assessment code did not show any serious risks, but indicated only a low risk due to lead and copper levels.

کلیدواژه‌ها [English]

  • Source identification
  • Risk Assessment
  • Lead
  • copper
  • Zinc. Gamma Test
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