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نرگس محراب مصطفی چرم مجتبی نوروزی مصیر

چکیده

با توجه به پیامدهای آلودگی فلزات سنگین در محیط زیست، آلودگی­زدایی این فلزات از اهمیت بالایی برخوردار است. در این تحقیق کارایی کلات­کننده نیتریلوتری­استیک­اسید (NTA) بر آبشویی کادمیوم و جذب آن توسط گیاه ذرت در یک خاک آلوده در آزمایشی گلخانه­ای بررسی گردید. در این مطالعه از سه سطح کادمیوم (0، 25 و 50 میلی­گرم بر کیلوگرم خاک) و سه سطح کلات NTA (0، 15 و 30 میلی­مول در لیتر در گلدان 8 کیلوگرمی) در خاکی با بافت لومی در کشت و عدم کشت گیاه ذرت و تحت شرایط سه دور آبیاری استفاده گردید. NTA طی سه مرحله بصورت محلول به گلدان­ها اضافه گردید. نتایج نشان داد که با افزایش سطح آلودگی کادمیوم و مقدار NTA مصرفی، میزان کادمیوم زه­آب و همچنین جذب کادمیوم توسط گیاه ذرت افزایش یافت. سطوح مختلف کادمیوم و NTA در دور اول آبشویی اختلاف معنی­داری در کادمیوم شسته شده نشان دادند و در دو دور بعدی تفاوت قابل ملاحظه­ای دیده نشد. میزان کادمیوم آبشویی شده از خاک گلدان­های بدون کشت گیاه در تیمار 50 میلی­گرم بر کیلوگرم کادمیوم با کاربرد 15 و 30 میلی­مول NTA نسبت به عدم کاربرد NTA به ترتیب 8 و 4/15 برابر افزایش داشت. درصورتی که در تیمارهای مشابه در حضور گیاه ذرت، میزان آبشویی کادمیوم در خاک به ترتیب 8/5 و 6 برابر نسبت به عدم کاربرد NTA افزایش نشان داد. کادمیوم جذب شده توسط گیاه ذرت در تیمارهای حاوی 50 میلی­گرم بر کیلوگرم کادمیوم در کاربرد 30 میلی­مول NTA حداکثر بوده و این مقدار 57 درصد بیش از عدم کاربرد NTA اندازه­گیری شد. NTA با کاهش در pH خاک و انحلال کربنات کلسیم از خاک بر افزایش کادمیوم آبشویی شده و کادمیوم جذب شده توسط گیاه اثر معنی­داری نشان داد. این نتایج به­خوبی اثر توأم NTA و گیاه ذرت در پالایش کادمیوم از خاک آلوده را نشان می­دهد.

جزئیات مقاله

کلمات کلیدی

آبشویی, کادمیوم خاک, گیاه¬پالایی, نیتریلوتری¬استیک¬اسید (NTA)

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ارجاع به مقاله
محرابن., چرمم., & نوروزی مصیرم. (2020). کارایی نیتریلوتری استیک اسید در آبشویی و پالایش کادمیوم از خاک توسط گیاه ذرت. آب و خاک, 34(3), 593-608. https://doi.org/10.22067/jsw.v34i3.78046
نوع مقاله
علمی - پژوهشی