مشخصات جذب سطحی کادمیم در تعدادی از خاک‌های آهکی ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد دانشگاه آزاد اسلامی واحد کرج

2 استادیار پژوهش موسسه تحقیقات خاک و آب

چکیده

زیست فراهمی و سرنوشت نهایی فلزات سنگین در محیط زیست بوسیله جذب شیمیایی کنترل می­گردد. در این پژوهش، خصوصیات جذب کادمیم در 19 خاک آهکی ایران در دامنه­ای از غلظت کادمیم (mM Cd8/12 024/0) و دمای 25 درجه سانتیگراد مطالعه گردید. همدماهای جذب بخوبی توسط معادلات فروندلیچ و لانگمویر توضیح داده شدند (00/1-95/0R2=  و 99/0-94/0R2= به ترتیب برای معادله­های لانگمویر و فروندلیچ). پارامتر حداکثر جذب کادمیم (qm) محدوده­ی بین 2460 تا 10226 میلی­گرم بر کیلو­گرم داشت. خاک­های با رس بالا بر اساس پارامتر حداکثر جذب لانگمویر بیشترین ظرفیت جذب را داشتند. نتایج نشان داد که رس، شن، کربن­آلی و ظرفیت تبادل­کاتیونی مهم­ترین خصوصیاتی از خاک هستندکه جذب کادمیم در خاک­های آهکی را تحت تأثیر قرار می­دهند. پارامتر حداکثر جذب لانگمویر و ضریب فروندلیچ همبستگی معنی­داری با ظرفیت تبادل کاتیونی، رس، سیلت، کربن آلی و شن داشتند. همچنین نتایج این مطالعه نشان داد که مقدار کربنات کلسیم معادل (CCE) با هیچ­کدام از پارامترهای معادلات همدمای جذب همبستگی معنی­داری ندارد.

کلیدواژه‌ها


عنوان مقاله [English]

Adsorption Characteristics of Cadmium by Some Calcareous Soils of Iran

نویسندگان [English]

  • Sh. Sharafbafi 1
  • K. Shahbazi 2
1 .Sc Student of Soil Science Department, faculty of Agriculture, Islamic Azad University of Karaj
2 Assistant Professor, Soil and Water Research Institute
چکیده [English]

The bioavailability and ultimate fate of heavy metals in the environment are controlled by chemical sorption. In this study, sorption characteristics of Cd in 19 calcareous soils of Iran were assessed at varying Cd concentrations (0.024-12.8 mM Cd) and 25°C. Sorption isotherms were well described by the Langmuir and Freundlich equations (R2= 0.95-1.00 and R2= 0.94-0.99 for Langmuir and Freundlich models, respectively).The maximum adsorption capacity of soils ranged from 2460 to 10226 mg kg-1. Soils with higher clay content had greatest sorption capacity as estimated by the maximum sorption parameter of the Langmuir equation. The results revealed that cation exchange capacity (CEC), clay, sand, and OC were the most important soil properties affecting Cd adsorption behavior in calcareous soils. Maximum adsorption parameter of Langmuir and Freundlich constant coefficients were significantly correlated with clay, sand, silt, CEC, and OC. However, No statistically significant relation was found between the model parameters and calcium carbonate equivalent (CCE)

کلیدواژه‌ها [English]

  • Adsorption Isotherm
  • Langmuir and Freundlich models
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