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تثبیت کادمیوم در خاک آلوده با استفاده از نانوبیوچار اصلاح شده با آهن | ||
تحقیقات آب و خاک ایران | ||
دوره 53، شماره 4، تیر 1401، صفحه 795-808 اصل مقاله (1.59 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2022.337907.669193 | ||
نویسندگان | ||
ندا مرادی* 1؛ عبدالامیر معزی2؛ شیلا خواجوی شجاعی1؛ پردیس خاجی3 | ||
1گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
2استاد، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
3گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
چکیده | ||
تجمع فلزات سنگین در سالهای اخیر بهدلیل فعالیتهای بشری در حال افزایش است. هدف از این پژوهش بررسی تأثیر نانوبیوچار و نانوبیوچار اصلاح شده با آهن، تهیه شده از گیاه نی بر تحرک و توزیع شکلهای شیمیایی کادمیوم در یک خاک آلوده بود. این پژوهش در سال 1400-1399 بهصورت آزمایش فاکتوریل، با دو فاکتور شامل نوع جاذب (در چهار سطح شامل بیوچار، بیوچار اصلاح شده، نانوبیوچار و نانوبیوچار اصلاح شده) و کاربرد بیوچار (در سه سطح شامل صفر، 5/0 و 1 درصد وزنی) در قالب طرح کاملاً تصادفی، در سه تکرار و در شرایط آزمایشگاهی انجام شد. پس از اعمال تیمارها، نمونههای خاک بهمدت 90 روز در شرایط انکوباسیون نگهداری شدند. در پایان آزمایش غلظت قابل دسترس و شکلهای شیمیایی کادمیوم اندازهگیری شد. همچنین فاکتور تحرک کادمیوم تعیین شد. نتایج نشان داد در اثر کاربرد تمامی جاذبها (بهویژه در سطح 1 درصد وزنی) غلظت کادمیوم قابل دسترس خاک، کادمیوم تبادلی و کادمیوم پیوند شده با کربناتها بهطور معنیداری کاهش یافت، در حالیکه کادمیوم پیوند شده با اکسیدهای آهن و منگنز، کادمیوم پیوند شده با مواد آلی و کادمیوم باقیمانده در خاک، بهطور معنیداری (05/0> P) افزایش یافت. بطوریکه مقدار کادمیوم قابل دسترس در تیمار 1 درصد نانوبیوچار اصلاح شده در مقایسه با تیمار شاهد 37/26 درصد کاهش یافت. نتایج همچنین نشان داد تیمار نانوبیوچار در تثبیت کادمیوم و کاهش تحرک آن در خاک مؤثرتر از بیوچار اولیه بود. افزون بر این، بیوچار و نانوبیوچار اصلاح شده در مقایسه با بیوچارهای اولیه کارایی بالاتری در ثبیت کادمیوم در خاک داشتند. بهطورکلی نتایج نشان داد نانوبیوچار نی و نانوبیوچار نی اصلاح شده با کلرید آهن، میتوانند جاذبهای مناسبی برای تثبیت کادمیوم در خاکهای آلوده باشند. | ||
کلیدواژهها | ||
آلودگی خاک؛ جاذب آلی؛ فراهمی کادمیوم؛ فاکتور تحرک | ||
مراجع | ||
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