Document Type : Research Paper
Abstract
نظر به مضرات آلاینده‌های فلزات سنگین برای سلامت مصرف کنندگان، این تحقیق باهدف بررسی غلظت کل فلزات سنگین سرب (Pb)، جیوه (Hg)، کادمیم (Cd)، آرسنیک (As) و کروم (Cr) در اندام‌های مختلف (ریشه، ساقه، برگ و بذر) گیاه سالیکورنیاپرسیکا آخانی (Salicornia persica Akhani) رویش یافته در دشت نمک مرد آباد کرج، مقایسه الگوی تجمع فلزات سنگین در اندام‌های مختلف گیاه، و همچنین بررسی ضرایب تجمع زیستی و انتقال این فلزات توسط اندام‌های مختلف گیاه سالیکورنیا اجرا شد. الگوی تجمع فلزات در ریشه، Cr>Pb>Hg>Cd>As، در ساقه Cr>Pb>Cd>As>Hg، در برگ Pb>Cr>As>Cd>Hg و در بذر Pb>As>Cr>Cd>Hg تعیین شد. ضریب تجمع زیستی ریشه برای تمامی فلزات سنگین در اندام‌های مختلف سالیکورنیا در محدوده صفر تا 0.29 بود. معلوم شد سالیکورنیا پرسیکا آخانی قابلیت انباشت خوبی برای فلزات سنگین ندارد و مناسب برای گیاه‌پالایی به نظر نمی‌آید. غلظت تمامی فلزات سنگین مورد مطالعه در اندام‌های گیاهی به‌طور معنی‌دار و قابل توجهی کمتر از غلظت آنها در آب و خاک (پروفایل 30-0 سانتی‌متر و 60-30 سانتی‌متر) محل رویش بود است. این گونه گیاهی با دارا بودن ضریب انتقال 0.287±5.01 توانایی بالایی در انتقال سرب جذب شده از ریشه به اندام‌های هوایی گیاه دارد. کمترین ضریب انتقال مربوط به فلز جیوه (0.04±0.38) بوده است.
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