نوع مقاله : مقاله پژوهشی

نویسنده

گروه خاک شناسی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

چکیده

اهداف: اثر متقابل فلزات سنگین با برخی عناصر از قبیل آهن بر قابلیت دسترسی فلزات سنگین در خاک تاثیر دارد‌، لذا این پژوهش با هدف بررسی اثر کمپوست لجن فاضلاب شهری اراک غنی‌شده با سرباره آهن بر کاهش قابلیت دسترسی کادمیوم در گیاه همیشه بهار مورد بررسی قرار گرفت.
مواد و روش‌ها: تیمارهای آزمایشی شامل کاربرد مقادیر 0 ، 15 و 30 تن در هکتار کمپوست لجن فاضلاب شهری اراک غنی شده با 0 و 5 درصد وزنی آهن خالص سرباره فولاد مبارکه اصفهان در یک خاک آلوده شده با مقادیر 0، 5، 10 و15 میلی گرم کادمیوم در کیلوگرم خاک بوده است. بعد از گذشت 60 روز از شروع آزمایش، ویژگی‌های فیزیکوشیمیایی خاک و غلظت کادمیوم ریشه و شاخساره گیاه همیشه بهار اندازه‌گیری شد و مقایسه‌ میانگین ها با آزمون LSD در سطح احتمال 5 درصد صورت پذیرفت.
یافته‌ها: افزایش کاربرد کمپوست لجن فاضلاب شهری اراک از 0 به 15 و 30 تن در هکتار در خاک آلوده به 10 میلیگرم کادمیوم در کیلوگرم خاک به ترتیب باعث کاهش 15و 35 درصدی در مقدار کادمیوم قابل دسترس خاک شد، این در حالی است که مقدار آهن قابل دسترس خاک به ترتیب 6/5 و 4/8 برابر افزایش یافت. مشابه این نتیجه، غلظت کادمیوم ریشه و شاخساره نیز به ترتیب 24 و 18 درصد کاهش یافت.
نتیجه‌گیری: نتایج این پژوهش حاکی از آن بود که کاربرد کمپوست لجن فاضلاب شهری اراک غنی شده با %5 آهن خالص احتمالاً توانسته است با تاثیر بر ویژگیهای فیزیکوشیمیایی خاک باعث افزایش قابلیت دسترسی آهن در خاک و گیاه و به دنبال آن کاهش قابلیت جذب کادمیوم شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of iron slag and municipal sewage sludge compost addition to soil on decreasing cadmium availability in pot marigold

نویسنده [English]

  • Amirhossein Baghaie

Department of Soil-Science, Arak Branch, Islamic Azad University, Arak, Iran

چکیده [English]

Background: Interaction effect of heavy metal and some metals such as Fe can affect soil heavy metal availability. Thus, this research was conducted to investigate the effect of Arak municipal sewage sludge compost with iron slag on decreasing cadmium uptake by pot marigold.
Materials and methods:: Treatments were consist of applying enriched Arak municipal sewage sludge compost (0, 15 and 30 t ha-1) with 0 and 5% pure Fe from iron slag of Mobarakeh Steel Complex in a polluted soil (0, 5, 10 and 15 mg Cd kg-1 soil). After 60 days, soil physic-chemical properties and root and shoot Cd concentration of pot marigold was measured and the least significant difference (LSD) statistical analysis was used to determine the differences between the means (p=0.05).
Results: Increasing the loading rate of Arak municipal sewage sludge compost from 0 to 15 and 30 t ha-1 in a Cd polluted soil (10 mg Cd soil-1) caused a decreasing in Cd availability by 15 and 35 percent, respectively, while the Fe availability increased by 5.6 and 8.4 times, respectively. Similar to this result, root and shoot Cd concentration was decreased by 24 and 18%, respectively.
Conclusion: The result of this study showed that applying sewage sludge compost enriched with 5% Fe pure can probably affect soil physico-chemical properties that increasing soil and plant Fe availability and thereby, decreasing Cd availability.

کلیدواژه‌ها [English]

  • cadmium
  • Iron slag
  • Availability
  • Municipal sewage sludge
  • Compost
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