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سپیده اکبری علیرضا کریمی کارویه امیر لکزیان امیر فتوت

چکیده

سنگ‌های فوق‌بازی به‌عنوان منابع بالقوه طبیعی عناصر سنگین به‌ویژه Ni و Cr در ورود خاک‌ شناخته شده‌اند. هدف از این مطالعه بررسی ویژگی‌های فیزیکی و شیمیایی و تغییرات غلظت عناصر Ni و Cr خاک‌های تشکیل شده در امتداد یک ردیف پستی و بلندی از سنگ‌های فوق‌بازی در غرب شهر مشهد بود. بدین منظور از افق‌های سه خاکرخ در موقعیت‌های قله ‌شیب، شیب ‌پشتی و پای‌ شیب نمونه‌برداری شد. عناصر Ni، Cr و Mn ، اکسیدهای آهن آزاد (Fed) و اکسیدهای آهن بی‌شکل (Feo) به‌ترتیب توسط تیزاب سلطانی توسط، سیترات-بیکربنات-دی‌تیونات و اسید اگزالیک عصاره‌گیری و توسط دستگاه جذب اتمی اندازه‌گیری شد. مورفولوژی افق‌ها نشان‌دهنده عدم تکامل و هوادیدگی خاک‌های مورد مطالعه بود. مقدار Ni از 6/52 تا 5/312 و Cr از 2/35 تا 3/135 میلی‌گرم بر کیلوگرم متغیر بود که نسبت به خاک‌های مناطق مرطوب کمتر است که می‌تواند به‌دلیل هوادیدگی کم خاک، اضافه شدن مواد بادرفتی شامل گچ و کربنات‌ها و کم بودن مقدار این عناصر در مواد مادری باشد. مقدار Ni و Cr از قله شیب به سمت پای شیب افزایش داشت. تغییرات هماهنگ Ni با Cr و Mn با Fed در خاک‌های مورد مطالعه نشان‌دهنده مشابهت این عناصر از نظر کانی‌شناسی و روند هوادیدگی بود. با توجه به مقدار زیاد نیکل و کروم در خاک‌های مورد مطالعه، لازم است که قابلیت جذب زیستی این عناصر مورد بررسی قرار گیرد.

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ارجاع به مقاله
اکبریس., کریمی کارویهع., لکزیانا., & فتوتا. (2015). تغییرات غلظت Ni، Cr و Mn در خاک‌های تشکیل‌شده در طول یک ردیف پستی و بلندی از سنگ‌های فوق‌بازی در غرب مشهد. آب و خاک, 29(2), 477-488. https://doi.org/10.22067/jsw.v0i0.34666
نوع مقاله
علمی - پژوهشی