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سینتیک واجذب مس در یک خاک لوم شنی آلوده شده به مس با کاربرد بیوچار اصلاح شده | ||
تحقیقات کاربردی خاک | ||
دوره 10، شماره 1، خرداد 1401، صفحه 29-45 اصل مقاله (1.2 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
زهرا دیانت مهارلویی* 1؛ مجید فکری2 | ||
1دانشکده کشاورزی، دانشگاه شهید باهنر کرمان ، بخش علوم و مهندسی خاک، کرمان، ایران. | ||
2استاد گروه علوم و مهندسی خاک، دانشکده کشاورزی دانشگاه شهید باهنر کرمان | ||
چکیده | ||
آلودگی و انباشتگی فلزات سنگین در خاک یکی از مهمترین چالشهای زیست محیطی میباشد که زندگی گیاهان، حیوانات و انسانها را تهدید مینماید. یکی از روشهای مؤثر در جهت کاهش اثرات زیانآور فلزات سنگین در خاکهای آلوده افزودن بیوچار به عنوان یک ماده اصلاحکننده به خاک میباشد. در این پژوهش کارایی بیوچار پوست نرم بادام و پوست برنج (دمای گرماکافت 500 درجه سانتیگراد) همچنین بیوچار اصلاح شده آنها با NaOH و HNO3 جهت به حداقل رساندن آلودگی خاک به مس مورد بررسی قرار گرفت. آزمایش به صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار اجرا شد. به همین منظور دو تیمار بیوچار پوست نرم بادام و پوست برنج (اصلاح نشده و اصلاح شده با NaOH و HNO3) در سطوح شاهد (بدون بیوچار) و چهار درصد وزنی استفاده گردید. به خاک هر گلدان مس در سه سطح (صفر، 50 و 200 میلیگرم بر کیلوگرم) از منبع نمک سولفات مس (CuSO4.5H2O) اضافه شد. در این راستا مدلهای سینتیک واجذب مس مورد ارزیابی قرار داده شدند. در دورههای زمانی مختلف از 30 دقیقه تا 48 ساعت به وسیله EDTA عصارهگیری انجام شد و غلظت مس موجود در نمونهها تعیین گردید. نتایج نشان داد کاربرد بیوچارهای اصلاح شده در تمام زمانها باعث کاهش معنیدار واجذب مس نسبت به تیمار شاهد گردید. بین بیوچار پوست نرم بادام و پوست برنج و همچنین ترکیبات اصلاحکننده بیوچارها اختلاف معنیداری از نظر آماری در سطح 5 درصد وجود داشت. بیوچار پوست برنج اصلاح شده نسبت به بیوچار پوست نرم بادام اصلاح شده موثرتر میباشد. بیوچار پوست برنج اصلاح شده با NaOH در مقایسه با بیوچار پوست نرم بادام اصلاح شده در غلظت 50 و 200 میلیگرم بر کیلوگرم در زمان 480 دقیقه، به ترتیب به مقدار 21 و 37 درصد کاهش نشان داد. معادله تابع توانی به دلیل ضریب تبیین بالا و خطای استاندارد پایین به عنوان بهترین معادله سینتیک واجذب مس معرفی شد. | ||
کلیدواژهها | ||
پوست برنج؛ اسید نیتریک؛ هیدروکسید سدیم؛ پوست نرم بادام؛ معادله تابع توانی | ||
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