بررسی پتانسیل جذب کادمیم توسط رسوبات معلق رودخانه روضه‌چای ارومیه در قدرت های یونی مختلف

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه مراغه

2 گروه زمین کشاورزی- دانشکده علوم- دانشگاه ارومیه- ارومیه- ایران

3 گروه زمین شناسی- دانشگاه ارومیه

4 عضو هیات علمی گروه مهندسی علوم خاک دانشگاه ارومیه

چکیده

در این پژوهش، اثر قدرت یونی در جذب کادمیم توسط رسوبات معلق رودخانه روضه چای واقع در بخش غربی دریاچه ارومیه بررسی شد. جذب کادمیم توسط رسوبات معلق در سیستم تعادلی یا پیمانه­ایی انجام شد. مطالعه جذب کادمیم توسط رسوبات مورد مطالعه (غلظت رسوبات g l-1 40) در دامنه غلظتی 0  تا 350 میکرومولار کادمیم در pH معین (pH ذاتی هر یک از رسوبات) در قدرت یونی 6، 12 و 25 میلی مولار نیترات کلسیم انجام گردید. در این تحقیق، برای توصیف داده­های جذب کادمیم، از معادله­های فرندلیچ، لنگمویر و ون-های استفاده شد. نتایج نشان داد با افزایش قدرت یونی جذب کادمیم در همه نمونه­های مطالعه شده کاهش می­یابد. نتایج بیانگر آن است که معادله­های فرندلیچ و لنگموئیر در همه نمونه­ها به خوبی بر داده­ها برازش داده شد. متوسط ماکزیمم جذب کادمیم توسط رسوبات مورد مطالعه (6 نمونه) در دامنه غلظت­های اولیه 0 تا 350 میکرومولار برابر 3/15 میکرومول بر گرم بدست آمد لذا، رسوبات معلق رودخانه روضه­چای ارومیه پتانسیل بسیار پایین در جذب و انتقال کادمیم دارا می­باشند. یعنی حتی در صورت حضور کادمیم در بستر رودخانه، این رسوبات معلق توانایی جذب کادمیم به طور قابل توجه نداشته و نمی­توانند بعنوان عامل انتقال دهنده کادمیم در محیط زیست تلقی شوند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of cadmium adsorption potential by suspended sediments of the Rozeh-Chay River, Urmia region at different ionic strengths

نویسندگان [English]

  • Marziyeh Karimpour 2
  • Hosein Pirkharati 3
  • Farrokh Asadzadeh 4
2 M.Sc. Graduate, Faculty of Science, Urmia University, Urmia, Iran
3 Department of Geology
4 Associate Professor, Soil Chemistry Laboratory, Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran.
چکیده [English]

In this research, suspended sediments of the Roze-Chay River, which were located on west part of Urmia Lake, were used to investigate the influence of ionic strength on sorption of cadmium. Adsorption of cadmium on the suspended sediments was investigated using batch experiments. The studied sediments (40 g l-1) was equilibrated in 6, 12, and 25 mmol l-1 ionic strength at definite pH with different cadmium concentrations (0-350 µmol l-1). The results indicate the more ionic strength; the less cadmium sorption occurs in all the samples. This effect of ionic strength on sorption can be attributed to the increased competition between competitive ions (Ca2+) and Cd2+. Isotherm data were described by using Freundlich, Langmuir, and Van-Huay models and better fitting were introduced Freundlich and Langmuir models. The average maximum adsorption capacity (b) of cadmium onto the suspended sediments was obtained 15.3 µmol g-1. Therefore, the suspended sediments have a very low potential for the sorption and transfer of cadmium. That means, even if cadmium is present in the bed of the river, these suspended sediments have no significant ability to sorb cadmium ions and cannot be considered as a carrier of cadmium in the environment.

کلیدواژه‌ها [English]

  • Ionic strength
  • Langmiur
  • Freundlich
  • Van-Huay
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