اثر اصلاح‌کننده‌های آلی و معدنی و زمان خواباندن بر شکل‌های شیمیایی سرب در یک خاک آهکی آلوده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 فارغ التحصیل دکتری علوم خاک، دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 دانشیار گروه علوم خاک، دانشکده مهندسی آب و خاکف دانشگاه علوم کشاورزی و منابع طبیعی گرگان

3 استاد گروه علوم خاک، دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

4 دانشیار گروه علوم خاک، دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

آلودگی خاک به  فلزهای سنگین به‌دلیل اثرهای مخرب آن بر محیط زیست مانند تهدید سلامتی انسان­ها، مسمومیت گیاهان و اثرهای طولانی‌مدتی که بر حاصلخیزی خاک می­گذارند، تبدیل به یک نگرانی جهانی شده است. این پژوهش برای تعیین اثرهای اصلاح­کننده­های آلی (بیوچار تولید شده در دو دمای 640 و 420 درجه سلسیوس) و معدنی (پومیس، لیکا، زئولیت و بنتونیت) و زمان انکوباسیون بر توزیع گونه­های سرب در بخش­های مختلف یک خاک آهکی آلوده انجام شد. برای این کار، آزمایشی به­صورت فاکتوریل و در قالب طرح کاملاً تصادفی با سه سطح اصلاح­کننده (0، 1 و 5 درصد وزنی) و دو زمان (90 و 180 روز) انجام گرفت. در پایان زمان انکوباسیون توزیع شکل­های سرب در بخش­های تبادلی، کربناتی، اکسیدهای آهن و منگنز، آلی و باقی‌مانده با روش عصاره­گیری دنباله­ای تسیر تعیین شدند. نتایج نشان داد که گذشت زمان باعث افزایش بخش سرب تبادلی (52/16 درصد)، کربناتی (02/1 درصد)، اکسید آهن و منگنز (53/9 درصد) و باقی‌مانده (1/2 درصد) و کاهش سرب در بخش آلی (26/15 درصد) گردید. همچنین، افزودن اصلاح­کننده­ها به خاک موجب کاهش معنادار غلظت سرب در بخش تبادلی (F1) گردید. بیشترین کاهش غلظت سرب در بخش تبادلی (F1) در سطح 5 درصد بیوچار 640 مشاهده گردید. یافته­های این پژوهش نشان داد که با گذشت زمان، بیوچار 640 مؤثرترین تیمار در کاهش غلظت سرب در بخش تبادلی بود. 

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Organic and Inorganic Amendments and Incubation Time on Fractionation of Lead in a Contaminated Calcareous Soil

نویسندگان [English]

  • Somayeh Sefidgar Shahkolaee 1
  • M. Baranimotlagh 2
  • F. Khormali 3
  • E. Dordipour 4
1 PhD Graduate, Dept. of Soil Sciences, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
2 Associate Professor., Dept. of Soil Sciences, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
3 Professor, Dept. of Soil Sciences, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
4 Associate Professor, Dept. of Soil Sciences, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
چکیده [English]

Soil pollution with heavy metals has become a global concern because of its damaging effects on the environment, including threats to human health, toxicity in plants, and long-term effects on soil fertility. This study was conducted to investigate the effect of organic amendments (biochar 640°C, and biochar 420°C) and inorganic amendments (Pumice, Leca, Zeolite and Bentonite) andincubation time on the chemical forms of Pb in a contaminated calcareoussoil. Treatments consisted of two incubation times (90 and 180 days) and three amendment levels (0, 1, and 5 wt%). The experiment was conducted in a factorial arrangement with completely randomized design, with three replications.  At the end of the incubation times, the chemical fractions of Pb were determined by Tessier sequential extraction method. The experimental resultsindicated that application of amendments effectively decreased the Pb concentrations in the exchangeable fraction (F1) of contaminated soils. The 5% biochar 640 showed the highest decrease in the F1 fraction of Pb. The results showed that Pb concentration increased the exchangeable (16.52%), carbonated (1.02%), oxide (9.53%), and residual (2.1%) fractions and decreased the organic fraction (15.26%) during the time. With the passing of time, treatment with Biochar 640°C and bentonite (5%) was the most effective in decreasing Pb concentration in exchangeable fraction.

کلیدواژه‌ها [English]

  • biochar
  • Incubation
  • Remediation
  • Sequential extraction
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