ارزیابی آلودگی ژئوشیمیایی رسوبات رودخانه پلرود در شرق گیلان، از دیدگاه زمین شناسی محیط‌‌زیستی (شرق گیلان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه زمین شناسی، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

2 کارشناسی ارشد، گروه زمین شناسی، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

چکیده

رسوبات رودخانه‌‌ای به ‌عنوان اصلی‌‌ترین جاذب آلاینده‌‌های فلزی، دارای اهمیت بسیاری هستند. در سطح جهانی، اکوسیستم‌‌های آبی شدیدا با فلزات سنگین ناشی از منابع انسانی و زمین زاد آلوده می‌‌شوند. موضوع این مطالعه، تحقیق در مورد آلودگی ژئوشیمیایی فلزات در رسوبات رودخانه و منشاهای احتمالی آن‌ها در رودخانه پلرود در شرق استان گیلان است. رسوبات رودخانه‌‌ای جمع‌آوری‌ شده، برای تعیین غلظت فلزات سنگین به روش ICP آنالیز شدند. درجه آلودگی در رسوبات رودخانه پلرود برای سرب، نیکل، روی، کبالت، کرم، تیتانیم و وانادیم با استفاده از شاخص آلودگی زمین‌شناسی و شاخص (فاکتور) آلودگی ارزیابی شد. نتایج حاصل گویای این است که: 1. محاسبه شاخص آلودگی زمین‌شناسی در رسوبات رودخانه پلرود دارای شاخص آلودگی به نسبت بالایی برای عنصر سرب و آلودگی متوسط برای عناصر کبالت و کروم می‌‌باشند؛ 2. فاکتور آلودگی برای عناصر سرب و آلومینیوم بسیار بالا، برای عناصر کبالت، کروم، نیکل و تیتانیم متوسط و برای عنصر روی پایین است؛ 3. رسوبات رودخانه توسط سرب و آلومینیوم آلودگی انسان‌‌زاد دارند و 4. عناصر کبالت و کروم آلودگی زمین زاد نشان می‌‌دهند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Geochemical Pollution From The Perspective of Environmental Geology In Pole- Rud Stream Sediment -East Of Guilan

نویسندگان [English]

  • Mojgan Salavati 1
  • Zahra Yousefimesrdashti 2
1 Assist. Profe. Department of geology, Lahijan Branch, Islamic Azad University, Lahijan, Iran
2 Masters, Department of geology, Lahijan Branch, Islamic Azad University, Lahijan, Iran
چکیده [English]

River sediments are one of great importance adsorbent of the metallic contaminants. Globally, aquatic ecosystems are highly polluted with heavy metals arising from anthropogenic and terrigenous sources. The objective of this study was to investigate the geochemical pollution of metal contaminations in stream sediments and it,s possible sources of in Pole-rud in easthern of Guilan province pollutants. Collected stream sediments were analysed for heavy metal concentration with ICP method. The degree of pollution in Pole-rud stream sediments for lead, Nickel, zinc, Cobalt, chromium, titanium and vanadium was assessed using geoaccumulation (Igeo) index and contamination factor (CF). The results indicated that: (1) the calculation of geo-accumulation index suggest that Pole-rud stream sediments have relatively high polluted index for lead element and moderately polluted for Cobalt and chromium; (2) contamination factor for lead and aluminum are very high contamination, for, Cobalt, chromium, titanium and vanadium are moderate contamination and for zinc is low contamination; (3) the sediments have been polluted with lead and aluminum have high anthropogenic influences; (4) Cobalt and chromium elements indicate terrigenous sources.

کلیدواژه‌ها [English]

  • Sediment contamination
  • Pole-rud
  • Geo-accumulation
  • Contamination Factor
  • Terrigenous sources Comprehensio
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