نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد علوم و مهندسی خاک (گرایش شیمی و حاصلیخزی)، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، ایران
2 استادیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، ایران
3 استادیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان ، ایران
4 استادیار، دانشکده منابع طبیعی و محیط زیست، دانشگاه پیام نور، تهران، ایران
چکیده
در ارزیابی کیفیت محیطزیست مناطق آلوده، قابلیت دسترسی فلزات سنگین برای گیاهان از اهمیت زیادی برخوردار است. هدف از این پژوهش، بررسی وضعیت آلودگی در ریزوسفر خاکهای اطراف کارخانه زغالشویی زرند به فلزات مس، روی، سرب و کادمیوم بر اساس قابلیت جذب فلزات سنگین و غلظت کل میباشد. در این مطالعه چهار منطقه بر اساس پوشش گیاهی غالب، تفکیک و نمونهبرداری مرکب (5 نمونه در هر نقطه) از 135 نقطه به طور سیستماتیک انجام شد. نمونههای خاک بعد از خشک شدن در معرض هوا و عبور از الک دومیلیمتری به آزمایشگاه انتقال یافتند. شکل قابل دسترس فلزات مس، روی، سرب و کادمیوم با استفاده از محلول 005/0 مولار DTPA-TEA در pH برابر با 3/7 استخراج و برای تعیین غلظت کل فلزات، از اسید نیتریک 5 نرمال استفاده شد و غلظت آنها با استفاده از دستگاه جذب اتمی تعیین گردید. بر اساس غلظت کل فلزات، شاخص زمین انباشتگی، فاکتور آلودگی و بار آلودگی برای هر چهار منطقه تعیین شدند. نتایج نشان داد که غلظت قابلدسترس فلزات مس، روی، کادمیوم و سرب در هر چهار ناحیه از استاندارد ارایه شده توسط سازمان محیط زیست ایران بیشتر بود. نتایج نشان داد که براساس شاخص زمین انباشتگی، هر 4 ناحیه مورد مطالعه دارای آلودگی شدید مس و سرب هستند، در حالیکه روی و کادمیوم در محدوده غیرآلوده تا کمی آلوده قرار دارند. شاخص بار آلودگی بیشتر از یک در تمامی نواحی مورد مطالعه نشان دهنده تاثیر منابع انسانی علاوه بر منابع طبیعی بر افزایش غلظت فلزات مس، روی، سرب و کادمیوم در خاک است.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Investigating on heavy metals availability and pollution indices in soils around coal washing factory (Zarand)
نویسندگان [English]
- M Ayeneh Heydari 1
- M Hejazi Mehrizi 2
- A Jafari 3
- M Yousefifard 4
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