مقایسه جذب فلزات سرب و روی در حضور فولویک اسید در یک خاک آهکی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد گروه علوم خاک دانشگاه فردوسی مشهد

2 استاد گروه علوم خاک دانشگاه فردوسی مشهد

3 دانشیار گروه علوم خاک دانشگاه فردوسی مشهد

چکیده

خاک از جمله پیچیده­ترین بخش­های محیط زیست است که سلامت اکوسیستم­ها تا حد زیادی به کیفیت آن بستگی دارد. لذا مطالعه حاضر با هدف بررسی تفاوت­های رفتاری فلزات سنگین سرب و روی در حضور مواد هیومیکی انجام شد. به این منظور آزمایشات به صورت پیمانه­ای شامل سطوح فلز سنگین (روی و سرب)، غلظت­های اولیه (0، 250، 500، 1000، 1500 و 2000 میلی گرم بر لیتر) در حضور و عدم حضور فولویک اسید در قالب یک طرح کاملاً تصادفی با آرایش فاکتوریل انجام گرفت. نتایج نشان داد که در عدم حضور فولویک اسید جذب سرب بیشتر از روی بود و همچنین در حضور فولویک اسید، جذب سرب و روی به­طور معنادار (p<0.05) به ترتیب افزایش و کاهش یافت. با استفاده از اطلاعات بدست آمده از همدمای فروندلیچ تخمین زده شد که فرایند جذب، احتمالاً شیمیایی بوده و با توجه به اینکه داده­های آزمایشی به­طور مناسب با همدمای فروندلیچ برازش یافتند، انرژی پیوند جذب به­طور یکنواخت توزیع شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of Zn and Pb Adsorption in the Presence of Fulvic Acid in a Calcareous Soil

نویسندگان [English]

  • E. Ghasemi 1
  • A. Fotovat 2
  • R. Khorasani 3
  • H. Emami 3
1 Former MSc student, Ferdowsi University of Mashhad
2 Professor, Soil Science Department, Faculty of Agriculture, Ferdowsi University of Mashhad
3 Associate Professor, Soil Science Department, Faculty of Agriculture, Ferdowsi University of Mashhad
چکیده [English]

Soil is one of the most complex parts of environment that ecosystems health greatly depends on its quality. This study aimed to investigate the behavioral differences of Zn and Pb in the presence of humic substances. An experiment was conducted to measure levels of heavy metals (Zn and Pb), 6 levels of initial concentrations (0, 250, 500, 1000, 1500, 2000 mg L-1) in the presence and absence of fulvic acid in a completely randomized design with factorial arrangement. The results showed that, in the absence of fulvic acid, Pb adsorption was greater than Zn, whileits presence significantly (p< .05) increased Pb adsorption but decreased Zn adsorption in the solid phase. By using the Freundlich isotherm, it was estimated that adsorption process was chemical and, since the experimental data fitted reasonably well with the Freundlich isotherm, adsorption energy on solid surface was distributed uniformly.

کلیدواژه‌ها [English]

  • Heavy metals
  • Humic substance
  • Freundlich isotherm

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پژوهش های خاک
دوره 31، شماره 3
آذر 1396
صفحه 431-439

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