بررسی تاثیر نانوذرات آهن صفر ظرفیتی (nZVI) بر تحرک و شکل‌های شیمیایی عناصر کادمیم و سرب در خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم خاک؛ دانشگاه ارومیه؛ ارومیه، ایران

2 دانشگاه ارومیه

3 عضو هیئت علمی گروه خاک دانشکده کشاورزی دانشگاه ارومیه

4 دانشکده کشاورزی دانشگاه ارومیه

5 دانشیار گروه علوم خاک، دانشگاه ارومیه

چکیده

تحرک و زیست‌فراهمی فلزات سنگین در خاک، به توزیع آن­ها بین فاز محلول و فاز جامد خاک و بین ترکیبات مختلف فاز جامد بستگی دارد. به‌منظور بررسی تأثیر نانوذرات آهن­ صفر ظرفیتی بر شکل­های شیمیایی عناصر کادمیم و سرب در خاک، آزمایشی بصورت فاکتوریل در قالب طرح کاملاً تصادفی با چهار سطح نانوذره (0، 1، 2 و 4 درصد) و چهار زمان­ خوابانیدن (1، 2، 4 و 8 هفته) در دو خاک آلوده و در سه تکرار انجام گرفت و توزیع عناصر در زمان­های مذکور با روش عصاره­گیری متوالی تعیین و شاخص تفکیک کاهش یافته (IR) و شاخص تحرک (MF) محاسبه شد. کاربرد نانوذره آهن­ صفر ظرفیتی موجب کاهش معنی­دار (P ≤ 0.01) کادمیم و سرب در بخش­های تبادلی و کربناتی و افزایش معنی­دار عناصر در بخش­های پیوند با اکسیدهای آهن و منگنز نسبت به خاک شاهد شد. با افزایش درصد نانوذره افزوده­شده به خاک و زمان خوابانیدن، مقدار IR افزایش و مقدار MF کاهش یافت که بیانگر کاهش تحرک فلز با افزایش درصد نانوذره است. درنهایت می­توان نتیجه­گیری کرد که افزودن نانوذره آهن صفر ظرفیتی به خاک، منجر به کاهش تحرک فلزات کادمیم و سرب در خاک می­شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Nano Zero Valent Iron Particles (nZVI) on Mobility and Chemical Forms of Cadmium and Lead in Soil

نویسندگان [English]

  • Roghaei Hamzenejad 1
  • Ebrahim Sepehr 2
  • Abbas Samadi 3
  • Mir Hasan Rasouli Sadaghiani 4
  • Habib Khodaverdiloo 5
1 Department of Soil Science, Urmia University, Urmia, Iran
2 Urmia University
3 Department of Soil Science, Urmia University, Urmia, Iran
4 Department of Soil Science, Urmia University, Urmia, Iran
5 Associate Prof., Dep. Soil Sci., Urmia University
چکیده [English]

The mobility and bioavailability of heavy metals in soils is dependent upon redistribution processes between solid and solution phases and among solid-phase components. In order to study the effect of nano zero valent iron (nZVI) on chemical forms of Cd and Pb in soils, an experiment was conducted as a factorial in a completely randomized design in three replications with 4 levels of nZVI (0, 1, 2 and 4 %), 4 levels of incubation time (1, 2, 4 and 8 weeks) and two soils. Chemical distribution of metals in soil was determined using sequential extraction method during mentioned incubation times and the reduced partition index (IR) and mobility factor (MF) of metals were calculated. Application of nZVI significantly (p ≤ 0.01) decreased the exchangeable and carbonate fractions and increased iron and manganese oxide bound fraction in comparison to the control treatment. The IR Values increased and MF values decreased with increasing nZVI levels and incubation time, result in a decrease in MF in soils. It is concluded that addition of nZVI in soil significantly could decrease MF of Cd and Pb in contaminated soils.

کلیدواژه‌ها [English]

  • Nano zero valent iron
  • Chemical forms of metal
  • Sequential extraction
  • Cadmium
  • lead
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