تأثیر ذرات رسوبی در حمل عناصر سنگین در بازۀ میانی رودخانۀ دز

نوع مقاله : پژوهشی

نویسندگان

1 پژوهشکدۀ حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران‌

2 مرکز تحقیقات کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز‌

3 سازمان آب و برق خوزستان، اهواز

چکیده

این پژوهش با هدف پایش و شناسایی وضعیت رسوب معلق و عناصر سنگین حمل‌شده در قسمتی از رودخانۀ دز پایین‏تر از سد دز تا محل اتصال شطیط و سهم جریانات ورودی از دو سرشاخۀ آن در استان خوزستان انجام گرفت. در مجموع، 38 نمونه در سه زمان شامل یک دورۀ کم‏آبی و دو رویداد سیلاب از ایستگاه‏های دوکوهه روی بالارود، دهنوباقر روی کهنک و دزفول و حرمله روی دز برداشت شد. پس از جدا‌کردن رسوب، تعدادی از نمونه‏ها به آزمایشگاه ارسال و عناصر سنگین با استفاده از دستگاه پلاسمای جفتی انتقالی اندازه‏گیری شد. نتایج بیان‌کنندۀ آن است که هیچ‌یک از عناصر از دیدگاه کشاورزی آلاینده نیست؛ ولی از دیدگاه حفاظت محیط زیست، نمونه‏های رسوب معلق آنالیز‌شده از نظر سه فلز سنگین کروم، کبالت و نیکل به‏ترتیب با دامنۀ مقادیر 88ـ 96، 20ـ 22 و 76ـ 91 قسمت در میلیون آلودگی داشتند. غلظت عناصر سنگین یادشده در ایستگاه پایاب حرمله بیش از سرشاخه‏ها بود که احتمالاً ناشی از ترسیب ذرات درشت‏تر رسوب بوده است. به‏عنوان نتیجۀ کلی می‏توان گفت که رسوب معلق بازه‏های بین ایستگاه دوکوهه تا حرمله و دهنوباقر تا حرمله از نظر سه فلز یادشده آلوده بوده‏اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Role of suspended particulates on heavy elements transport in the middle part of Dez River

نویسندگان [English]

  • Mahmood Arabkhedri 1
  • Feridoun Soleimani 2
  • Saeed Nabipay Lashkarian 1
  • Feridoun Soltani 3
1 Water & Soil Conservation Dep., SCWMRI
2 Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural, Education and Extension Organization, Ahvaz, Iran
3 Khuzestan Water and Power Authority
چکیده [English]

This study was performed in order to monitor and recognize the condition of transported suspended particulates and absorbed heavy metals in Dez river between Shahid Abbaspour Dam and Shotate river Junction and the effect of inflow from two tributaries in Kouzestan province, Iran. We took 38 samples in three steps including a base flow period and two flood events from four gauging sites including Dokouheh on Balaroud, Zourabad on Kohnak, Dezful on Dez upstream and Harmalah on Dez downstream. After sediment filtration, some samples were analyzed by Inductively Coupled Plasma to determine 12 heavy metals. The results showed that the river suspended sediment classified as not polluted by heavy metals for agriculture purpose at least for studies samples. However, the amount of three heavy metals including Cobalt (20-22 ppm), Chrome (88-96 ppm) and Nickel (76-91 ppm) are more than environmental safe thresholds. In addition, the concentration of those heavy metals in downstream station is more than tributaries which is probably due to deposition of coarser sediment particles. Therefore, it can be concluded that the suspended sediments between Dokouheh to Haramalah reach and Zourabad to Haramalah reaches are polluted by three mentioned heavy metals.

کلیدواژه‌ها [English]

  • Heavy metals
  • Non-source pollutants Suspended sediment
  • Sediment management
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