بررسی غنی‌شدگی، سمناکی و خطر بوم‌شناختی فلزات سنگین در رسوبات سطحی رودخانه بهمنشیر آبادان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی

2 دانشکده علوم زمین، دانشگاه شهیدچمران اهواز

3 دانشجوی کارشناسی ارشد زمین شناسی زیست محیطی،دانشگاه شهید چمران اهواز

چکیده

     در سال‌های اخیر آلودگی فلزی در محیط‌زیست آبی به علت سمیت، فراوانی و پایداری در محیط، توجه جهان را به خود جلب کرده است. این تحقیق به‌منظور تعیینغلظت،منشأ وسمیت فلزات سنگین )کروم( (Cr، مس(,(Cu روی( Zn) ، سرب(( Pb، نیکل ( Ni) ، آرسنیک( (As، منگنز,(Mn) و آهن (Fe)) در رسوبات بستر رودخانه بهمنشیر انجام‌شده است. در این مطالعه تعداد14 نمونه رسوب سطحی از عمق 0تا10 سانتی‌متری رسوبات کف بستر با نمونه‌گیر گرب برداشته شد. جهت تعیین غلظت فلزات سنگین از دستگاه ICP-OES استفاده شد. پارامترهای فیزیکی شیمیایی رسوبات (اسیدینگی (pH) و مواد آلی ) توسط روش‌های استاندارد اندازه‌گیری شد. به‌منظور ارزیابی آلودگی رسوبات به فلزات سنگین شاخص‌های ضریب غنی‌شدگی، خطر بوم‌شناختی،و پتانسیل سمناکی حاد محاسبه شد. نتایج، آلودگی متوسط رسوبات به فلزات نیکل و کروم؛و سطح خطر کم رسوبات را نشان داد. تحلیل‌های آماری انجام‌شده نشان می‌دهد که فلزات مس،روی،سرب و کروم دارای منشأ انسانی ؛ آرسنیک ناشی از منابع زمین زاد ؛و نیکل دارای هردو منشأ انسانی و زمین زاد است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of enrichment, toxicity and ecological risk of heavy metals in Bahmanshir River surface sediments

نویسندگان [English]

  • Fatemeh Rastmanesh 1
  • Ali Reza Zarasvandi 2
  • Masoomeh Tolabi 3
چکیده [English]

     In recent years, metal contamination in the aquatic environment has attracted global attention owing to its environmental toxicity, abundance and persistence. This study was carried out to determine the concentration, origin and toxicity of heavy metals (Fe,Mn,As,Ni,Pb,Zn,Cu,Cr) in surface sediments of Bahmanshir River.14 surface sediment samples (0-10 cm) were collected using a grab sampler. Concentration of heavy metals was measured using ICP-OES method. Physico-chemical parameters (pH, Organic Matter (OM)) of sediment were determined by standard methods. In order to assess sediment contamination to heavy metals, different indices, Enrichment Factor, Potential acute toxicity and Ecological risk were calculated. The results showed moderate contamination of sediment with metals of Ni and Cr ؛and low risk level of sediments. The Statistical analysis showed that metals Pb,Zn,Cu,Cr may have originated from anthropogenic sources ; As can originate from natural process and Ni seems to have both natural and anthropogenic sources.

کلیدواژه‌ها [English]

  • Heavy metals
  • Aquatic environment
  • Bahmanshir river sediments
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دوره 40، 1-1
ویژه نامه
خرداد 1396
صفحه 123-137
  • تاریخ دریافت: 16 آبان 1394
  • تاریخ بازنگری: 17 خرداد 1396
  • تاریخ پذیرش: 22 فروردین 1395
  • تاریخ انتشار: 11 دی 1348