نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشکده کشاورزی، دانشگاه ارومیه، ارومیه

2 گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه

چکیده

سینتیک آزاد سازی فلزات سنگین (روی، سرب، نیکل، مس و کادمیوم) از دو نمونه رسوب رسی گرفته شده از عمق 0 تا 10 سانتی متری پائین دست رودخانه قره چای واقع در استان همدان که با نمک نیتراته این فلزات آلوده شده بودند، با روش ستون آبشویی مطالعه شد. سرعت آزادسازی فلزات سنگین از نمونه‌های آلوده در ابتداء سریع و با گذشت زمان از سرعت آزادسازی آن‌ها کاسته شد. سرب رفتار متفاوتی نسبت به سایر فلزات از خود نشان داد و بطور آهسته ولی پیوسته از ستون آبشویی خارج شد. بطور کلی، مدل مرتبه‌ی اول دو مکانی قابلیت مطلوبی در توصیف فرآیند آزادسازی فلزات سنگین از نمونه‌های رسوب آلوده شده، از خود نشان داد. هر چند برای برخی از فلزات مانند سرب، روی و کادمیوم در رسوب (1) و سرب در رسوب (2) مدل مرتبه اول تک مکانی نیز توانایی بالایی در پیش بینی داده‌های مشاهده‌ای داشت. میانگین مقادیر ضریب تبیین و RMSE برای مدل مرتبه اول در حالت دو مکانی به ترتیب برابر با 986/0 و 046/0 است. این مقادیر برای مدل در حالت تک‌مکانی به ترتیب برابر 905/0 و 054/0 می‌باشد. مقادیر کل آبشویی یافته‌ی فلزات سنگین در مقایسه با کل محتوای فلزات سنگین رسوبات ناچیز بود که نماینگر توانایی بالای رسوبات رسی در جذب و نگهداشت فلزات سنگین است که این امر با مقادیر کم ضریب سرعت دفع ظاهری در مدل مرتبه اول قابل تبیین است.

کلیدواژه‌ها

عنوان مقاله [English]

Kinetics Fractionation of Heavy Metals Release From Clayey Sediments Using Leaching Column

نویسندگان [English]

  • Hamed Arfania 1
  • Farrokh Asadzadeh 2

1 Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia

2 Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia

چکیده [English]

The kinetics of release of heavy metal ions zinc, lead, nickel, copper and cadmium from the depth of 0 to 10 cm of downstream river sediment located in Hamedan Province, polluted with nitrate salt of these metals, were studied using the leaching column method. The rate of desorption of heavy metals from polluted sediments was initially rapid and, then, gradually declined over time; the behavior of Pb was different and it was released in a gradual and continuous manner. In general, the release of heavy metals from clayey sediments polluted by an inorganic source conformed to a two-site model of first order kinetics; however, the release of Zn, Cd and Pb from sediment (1) and Pb from sediment (2) could also be adequately accounted for by a single-site model. The average coefficients of determination and RMSE for metals in the first order kinetics were 0.905 and 0.054 for a single-site model and for a two-site model were 0.986 and 0.046, respectively. Considering the total heavy metal content of sediments, the cumulative quantity of leached metals was low, indicating a high retention capacity of the sediments for heavy metals. This statement can be elucidated by the low values of the apparent coefficient of desorption in the first order kinetics model.

کلیدواژه‌ها [English]

  • Kinetics of Release
  • Heavy Metals
  • Sorption
  • Clayey Sediment

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