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ارزیابی فلزات سنگین در رسوبات تالاب هورالعظیم با محاسبه شاخصهای آلودگی | ||
تحقیقات آب و خاک ایران | ||
دوره 51، شماره 10، دی 1399، صفحه 2469-2481 اصل مقاله (1.45 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2020.298194.668505 | ||
نویسندگان | ||
هاجر عبیات1؛ محمد رضا انصاری* 1؛ نفیسه رنگ زن1؛ احمد عبیات2 | ||
1گروه علوم خاک، دانشکده کشاورزی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، ایران. | ||
2گروه مهندسی نفت، واحد امیدیه، دانشگاه آزاد اسلامی، امیدیه، ایران. | ||
چکیده | ||
فلزات سنگین در سالیان اخیر به دلیل ثبات و پایداریشان درخاک و همچنین ایجاد آلودگیهای زیستمحیطی، شدیداً مورد توجه قرار گرفتهاند. در رسوبات بخش قابل توجهی از فلزات سمی، جذب رسها شده و برای مدت زیادی در سطح باقیمانده و یا در اثر باد، همراه رس به هوا برخاسته و بر شدت آلودگی هوا نیز میافزایند. بخشی از تالاب هورالعظیم تحت تأثیر خشکسالیهای پی در پی به کانون ریزگرد تبدیل شده است؛ لذا پژوهش حاضر با هدف بررسی آلودگی رسوبات تالاب هورالعظیم به فلزات سنگین صورت گرفت. به این منظور، تعداد 65 نمونه از عمق 15-0 سانتیمتری رسوبات تالاب هورالعظیم برداشت و با استفاده از دستگاه جذب اتمی غلظت عناصر اندازهگیری گردید. جهت مطالعه سطح آلودگی رسوبات، شاخص ژئوشیمیایی مولر، فاکتور غنیشدگی، ضریب آلودگی و شاخص بارآلودگی محاسبه شدند. نتایج نشان داد که بر اساس شاخص ژئوشیمیایی مولر عناصر کادمیم، نیکل و کروم در محدوده غیرآلوده تا آلودگی متوسط و عناصر سرب، مس، روی، آهن و منگنز در محدوده غیرآلوده قرار دارند. همچنین بر اساس فاکتور غنیشدگی عنصر کادمیم دارای غنیشدگی شدید، نیکل و کروم غنیشدگی متوسط و عناصر سرب، مس، روی، آهن و منگنز غنیشدگی اندک داشتند. ضرایب آلودگی نیز برای سرب، مس، روی، آهن و منگنز کم، برای نیکل و کروم متوسط و برای کادمیم در سطح خیلی زیاد بدست آمد. شاخص بار آلودگی، همهی نقاط مورد مطالعهرا غیرآلوده نشان داد. لذا بر اساس شاخصهای محاسبه شده عناصر کادمیم و سپس نیکل و کروم تا حدی بالاتر از حد مجاز بوده که علت آن را میتوان ورود از مسیر پساب کارخانجات، تأسیسات نفتی و همچنین کودهای شیمیایی دانست. | ||
کلیدواژهها | ||
کانون ریزگرد؛ تالاب هورالعظیم؛ فلزات سنگین؛ شاخصهای آلودگی | ||
مراجع | ||
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