اثر غلظت کادمیم و سرب اضافه شده بر زیست فراهمی آن‌ها در خاک‌های مختلف

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 فلزات سنگین یکی از فاکتورهای کلیدی مورد استفاده در ارزیابی خاک­های آلوده می­باشد. در این پژوهش اثر غلظت و زمان بر زیست فراهمی کادمیم و سرب اضافه شده به یک خاک اسیدی و سه خاک قلیایی بررسی شد. به نمونه­های خاک پنج غلظت متفاوت کادمیم و سرب اضافه شده و در رطوبت 85 درصد ظرفیت مزرعه به مدت یکسال در دمای ثابت 25 درجه سانتی­گراد خوابانده شد. در فواصل زمانی معین نمونه­ها برای اندازه­گیری کادمیم و سرب قابل استخراج به روش DTPA برداشت شد. نتایج نشان داد تعییرات زیست فراهمی کادمیم و سرب در ابتدا شدید بوده و سپس کند می­شود. الگوی تغییرات زیست فراهمی کادمیم و سرب در غلظت­های مختلف به استثنای 5000 میلی­گرم بر کیلوگرم سرب مشابه بود. زیست فراهمی کادمیم و سرب اضافه شده به خاک­های آهکی پس از یک سال به­طور میانگین 4/50 و 57 درصد کاهش یافت و این مقدار در خاک اسیدی به ترتیب 4/35 و 42 درصد بود. کادمیم و سرب قابل استخراج با افزایش مقدار کادمیم و سرب اضافه شده به خاک افزایش یافت ولی در محدوده غلظت مورد پژوهش این افزایش برای کادمیم خطی و برای سرب غیرخطی بود. همچنین، مقایسه ضرایب تبیین ((R2 نشان داد معادله اصلاح شده پروبرت لارسن برازش مناسب را به داده­ها دارد (001/0>p ،99/0 تا 92/0 R2=)

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Cadmium and Lead Concentrations on Their Bioavailability in Different Soils

نویسندگان [English]

  • Sh. Sharafbafi 1
  • K. Shahbazi 2
1 M.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 objective of this study was to investigate the effect of time and concentration on bioavailability of added Cd and Pb to one acidic and three alkaline soils. The soils were treated with five different concentrations of Cd and Pb and incubated at 85% field capacity and constant temperature of 25 ° C for one year.  Samples were taken at certain intervals and extracted by DTPA method. Results showed that decrease in Cd and Pb bioavailability were initially rapid followed by a slower rate at longer time. Time dependence of Cd and Pb bioavailability in different concentrations had a similar pattern, except for 5000 mgPb kg-1. After one year, the bioavailability of soil-added Cd and Pb decreased 50.4% and 57 % in alkaline soils and 35.4% and 42% in acidic soil, respectively. bioavailability increased with increasing soil-added Cd and Pb levels, but this increase was linear for Cd and nonlinear for Pb. Comparison of coefficients of determination (R2) showed that the modified Probert- Larsen equation was able to describe the results (R2=0.92 to 0.99, p<0.001).

کلیدواژه‌ها [English]

  • Heavy metals
  • Kinetics
  • DTPA
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