بررسی غلظت فلزات سنگین (کادمیوم، مس، منگنز، نیکل، سرب و روی) در رسوبات رودخانه زاینده رود

نوع مقاله: Research Paper

نویسندگان

1 دانشجوی دکترای رشته محیط زیست، دانشگاه ملایر.

2 استادیار گروه محیط زیست، دانشگاه ملایر

چکیده

زمینه و هدف: ورود عوامل آلاینده ناشی از فعالیت های طبیعی و انسانی به محیط یکی از مهمترین مسائل رو در روی جوامع امروزی است. هدف: پژوهش حاضر از مطالعات آزمایشگاهی، میدانی و مرور منابع بهره برده است. این مقاله با هدف تعیین غلظت فلزات سنگین (کادمیوم، مس، منگنز، نیکل، سرب و روی) در رسوبات رودخانه زاینده رود و مقایسه آنها در ایستگاهها و فصول مختلف از اوایل مهر ماه 1393 تا اواخر شهریور ماه 1394 انجام شده است.
روش کار: جهت تعیین غلظت فلزات سنگین از تکنیک ICP-AES توسط دستگاه جذب اتمی استفاده شد و سپس با نرم افزارهای آماری و شاخص مولر به بررسی میزان آلایندگی فلزات پرداخته شد. حوضه آبخیز زاینده رود در طول جغرافیایی 50 درجه و 2 دقیقه تا 53 درجه و 24 دقیقه شرقی و عرض 31 درجه و 12 دقیقه تا 33 درجه و 42 دقیقه شمالی قرار دارد.
یافته‌ها: نتایج حاکی از میزان بالای غلظت کادمیوم در ایستگاه پل وحید در فصل تابستان با مقدار 0.0081±0.95، میلی گرم بر کیلوگرم وزن خشک است که از استاندارد کیفیت رسوب کانادا و نیویورک بالاتر است. شاخص مولر نیز میزان کادمیوم در پل وحید را در وضعیت آلودگی متوسط، نشان داد.
نتیجه‌گیری: نتایج حاکی از میزان بالای غلظت کادمیوم و بیشتر از استاندادهای جهانی به دلیل صنایع آبکاری و فعالیت های کشاورزی در ایستگاهای بالادست است. میزان بالای منگنز در پل چوم و سرب در ورزنه نیز بیشتر به فعالیت های کشاورزی مربوط است. به طور کلی ایستگاه پل وحید نسبت به سایر ایستگاهها وضعیت نامناسب تری دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of heavy metals concentration (cadmium, copper, manganese, nickel, lead and zinc) in sediments of Zayandehrood River

نویسندگان [English]

  • Mojgan Mirzaei 1
  • Eisa solgi 2
1 PhD student in environmental science, Malayer university
2 Asistatnt Proffesor, Department of Environment, Faculty of Natural Resources and Environment, Malayer University
چکیده [English]

Background and objective: Emission of pollutants caused by natural and human activities on the environment is one of the most important issues in today's society. Objective: This study was based on laboratory studies, field and review of the literature. The aim of this study to determine the concentration of heavy metals (cadmium, copper, manganese, nickel, lead and zinc) in the sediment of Zayandehrood river sediments and comparing them at  different stations and  various seasons from early October 2014 until late September 2015.

Materials & Methods: ICP-AES techniques were used to determine the concentrations of heavy metals by atomic absorption spectrophotometer and then the emissions of metals evaluated with statistical software and Mueller indicator. Zayanderood basin is located in 50° 2´ to 53° 24´ east longitude and 31° 12´ to 33° 42´ north latitude.

Results: The results showed high levels of cadmium concentration in Vahid Bridge station in the summer with the amount of 0.0081 ± 0.95, milligrams per kilogram of dry weight that is higher than Canada and New York sediment quality standard.

Conclusion:The results showed high levels of cadmium and further concentration of global standards for electroplating industry and agricultural activities in upstream stations. High levels of manganese and lead in Chum Bridge and Varzaneh are related to agricultural activities mainly. Generally, Vahid Bridge station has more unsuitable situation than the other stations.

کلیدواژه‌ها [English]

  • pollution
  • Isfahan province
  • atomic absorption spectrophotometer
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