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تأثیر اسید سیتریک بر ویژگی های جذب روی در دو خاک آهکی | ||
تحقیقات آب و خاک ایران | ||
مقاله 19، دوره 46، شماره 4، دی 1394، صفحه 781-790 اصل مقاله (608.23 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2015.56801 | ||
نویسندگان | ||
مرضیه پیری1؛ ابراهیم سپهر* 2 | ||
1دانشجوی دکتری علوم خاک دانشگاه ارومیه | ||
2دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه | ||
چکیده | ||
روی یکی از عناصر ریزمغذی ضروری برای گیاهان، حیوانات و انسانهاست. قابلیت دسترسی روی برای ریشة گیاه، از طریق واکنشهای جذب کنترل میشود. برای بررسی تأثیر اسید سیتریک بر رفتار جذب روی، آزمایشی به صورت بچ (Batch) روی دو نوع خاک (S1 و S2) با درصدهای رس و کربنات کلسیم مختلف با سه سطح اسید سیتریک (0، 5/0، 1 میلیمولار) و 12 سری غلظتی روی (0 تا450 میلیگرم بر لیتر) در محلول زمینة 05/0 مولار NaCl انجام شد. دادههای جذب با مدلهای لانگمویر (95/0-76/0=R2)، فروندلیچ (95/0-83/0=R2)، تمکین (92/0-62/0=R2)، دوبینین- رادشکویچ (92/0–44/0=R2) و ایلوویچ (90/0–54/0=R2) برازش داده شد. نتایج نشان داد پارامترهای جذب شامل حداکثر جذب تکلایهای لانگمویر (qmax)، انرژی جذب لانگمویر (KL) و فاکتورهای ظرفیت و شدت جذب فروندلیچ (Kf و n)، ضرایب تمکین (A، KT) و حداکثر ظرفیت جذب دوبینین- رادشکویچ (qm) با افزودن اسید سیتریک کاهش یافت. مقادیر پارامترهای جذب در خاک S1 (با مقادیر رس و کربنات کلسیم پایین) کمتر از خاک S2 (با مقادیر رس و کربنات کلسیم بالا) بهدست آمد. متوسط انرژی جذب محاسبهشده از طریق معادلة دوبینین- رادشکویچ و پارامتر انرژی آزاد گیبس (Gr∆) نشاندهندة سازوکار جذب فیزیکی و خودبهخودی روی است. میتوان نتیجه گرفت اسید سیتریک احتمالاً با تشکیل کمپلکسهای محلول با روی موجب کاهش جذب توسط ذرات خاک و افزایش روی محلول خاک میشود. بنابراین، اصلاح گیاهان برای ترشح بیشتر اسید سیتریک در افزایش جذب روی در گیاهان مؤثر است. | ||
کلیدواژهها | ||
اسید آلی با وزن مولکولی کم؛ اسید سیتریک؛ جذب؛ روی | ||
عنوان مقاله [English] | ||
Effect of Citric Acid on Characteristics of Zinc Sorption in Calcareous Soils | ||
نویسندگان [English] | ||
Marzieyh Piry1؛ Ebrahim Sepehr2 | ||
1Former Graduate Student, Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran | ||
2Associate Professor, Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran | ||
چکیده [English] | ||
Zinc (Zn) is an essential micronutrient needed by plants, animals and humans. Bioavailability of Zn to plant root is controlled through sorption process in soils. To evaluate the effect of citric acid on Zn sorption, a batch experiment was conducted with two soil samples (S1, S2), that differed in their clay and calcium carbonate contents. Three levels of citric acid (0, 0.5, 1 mM) and twelve various Zn concentrations (0 to 450 mg L-1) in a medium of 0.05 M NaCl solution were applied to the soils. Adsorption data were fitted to Langmuir (R2=0.76-0.95), Freundlich (R2=0.83-0.95), Temkin (R2=0.62-0.92), Dubinin-Radushkevich (R2=0.44-0.92) and Elovich (R2=0.54-0.90) isotherm models. Sorption parameters including maximum adsorption of Langmuir (qmax), Freundlich capacity and intensity factors (KF, n), coefficients of Temkin equation (A, KT) and maximum adsorption capacity Dubinin-Radushkevich (qm) decreased by application of citric acid. The above mentioned sorption parameters related to S1 (low clay and calcium carbonate) were lower than those belonging to S2 (high levels of clay and calcium carbonate). The sorption energy parameter of D-R isotherm and Gibbs free energy change (ΔGr) indicated that the Zn adsorption processes were physical and spontaneous. The results of the experiments revealed that the application of citric acid significantly decreased Zn sorption by soil particles, probably due to formation of soluble complexes, and consequently increased Zn availability to plants. Therefore, through a modification of plants to secrete higher levels of citric acid, one can expect the absorption of Zn by this plants.To be further promoted. | ||
کلیدواژهها [English] | ||
Zinc, Citric acid, sorption, Low molecular weight organic acid | ||
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