سینتیک واجذب کادمیم در حضور کمپوست پوست نرم بادام و بیوچار آن در خاک آهکی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده کشاورزی، دانشگاه شهید باهنر کرمان ، بخش علوم و مهندسی خاک، کرمان، ایران.

2 استاد گروه علوم و مهندسی خاک، دانشکده کشاورزی دانشگاه شهید باهنر کرمان

چکیده

کادمیم یکی از رایج­ترین و خطرناک­ترین آلودگی­های محیط زیست می­باشد. اثر کمپوست پوست نرم بادام و بیوچار آن برسینتیک واجذب کادمیم در یک خاک آهکی در مزرعه دانشکده کشاورزی شهید باهنر کرمان بررسی شد. به همین منظور از کمپوست و بیوچار پوست نرم بادام در سه سطح (صفر، 2 و 4 درصد وزنی) استفاده شد که به خاک آهکی آلوده با سطوح صفر، 40 و 80 میلی­گرم بر کیلوگرم کادمیم افزوده گردید. نمونه­برداری از خاک­های تیمار شده، 45 و 90 روز بعد از آلوده شدن خاک­ها با کادمیم، انجام شد. در دوره­های زمانی مختلف از 5 تا 2880 دقیقه به وسیله EDTA عصاره­گیری شدند و غلظت کادمیم موجود در نمونه­ها تعیین گردید. نتایج نشان داد که کاربرد کمپوست و بیوچار پوست بادام باعث کاهش واجذب کادمیم نسبت به تیمار شاهد شد، کمترین میزان واجذب کادمیم در خاک، در سطح 4 درصد وزنی بیوچار و کمپوست رخ داد، در حالیکه بیوچار بیشترین کاهش را در میزان واجذب کادمیم در مقایسه با کمپوست داشت. براساس نتایج حاصل از آزمایش، واجذب کادمیم در تمامی تیمارها در زمان­های اولیه بیشترین مقدار بود و با گذشت زمان کاهش یافت. به عبارت دیگر 50 درصد واجذب کادمیوم در 2 ساعت اولیه رخ داد. در نمونه­برداری­های 90 روزه در مقایسه با 45 روزه، واجذب کادمیم از خاک بیشترین کاهش را نشان داد. براساس ضریب تبیین و خطای استاندارد بهترین معادله تابع توانی به عنوان بهترین معادله پیش­بینی کننده روند سینتیک واجذب کادمیم در خاک مورد مطالعه می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Cadmium Desorption Kinetics in the presence of the soft Almond Husk Compost and Biochar in a Calcareous Soil

نویسندگان [English]

  • zahra dianat maharluei 1
  • Majid Fekri 2
1 Agriculture Faculty, Shahid Bahonar University of Kerman, Department of Soil Science, Kerman, Iran.
2 Professor, Department of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman
چکیده [English]

Cadmium (Cd) is one of the most common and dangerous environmental contaminants. The effect of soft almond husk compost and its biochar was studied in the kinetic of cadmium desorption on a calcareous soil in the field of Shahid Bahonar Agricultural College, Kerman. For this purpose, compost and biochar of soft almond husk were used in three Levels (0, 2 and 4 % w/w) and were added to calcareous soil contaminated with three levels of cadmium (0, 40 and 80 mg kg-1). Sampling from treated soils was carried out 45 and 90 days after the contamination of soils with cadmium. Samples from treated soils were extracted by EDTA in 5 to 2880 minutes in different periods of time and the concentrations of cadmium were measured. The results showed that the application of compost and soft almond husk biochar reduced the desorption of cadmium compared to the control. The lowest amount of cadmium desorption occurred at level 4% w/w biochar and compost, while biochar had the highest reduction amount in the desorption of cadmium compared to the soft almond husk compost. Based on the experimental results, the cadmium desorption was highest in all treatments at initial times and decreased over the time. In other words, 50% of cadmium desorption occurred in the first 2 hours. In 90-day sampling compared to 45-day one, cadmium desorption from soil showed the highest decrease. Based on the determination of coefficient and standard error, the power function equation is considered as the best predictor of the cadmium release kinetics trend in the studied soil.

کلیدواژه‌ها [English]

  • Almond soft skin
  • Desorption kinetics
  • Cadmium
  • Compost
  • kinetic equation
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