اندازه‏گيري و پهنه‏بندي آلودگي فلزات‏سنگين در خاک با استفاده از سيستم اطلاعات جغرافيايي اراضي جنوب شهر تهران

ملیحه جمالی, کورس خوشبخت, رضا دیهیم فرد, رضا مومنی وصالیان

چکیده


این تحقیق با هدف اندازه‏گیری و پهنه‏بندی آلودگی فلزات سنگین در خاک زمینهای کشاورزی جنوب شهر تهران به مساحت 1500 هکتار انجام شد. در این مطالعه در 64 نقطه تعداد 128 نمونه خاک به روش سیستماتیک-تصادفی از دو عمق صفر تا 30 و 60-30 سانتی‌متری برداشت شد و غلظت پنج عنصر کادمیم، کروم، نیکل، سرب و روی اندازه‌گیری گردید. همچنین پارامترهایی مانند pH، EC و فسفات نیز اندازه‏گیری شد. نقشه‏های پهنه‏بندی با روش وزن‏ دهی عکس فاصله تهیه گردید. نتایج به دست آمده نشان داد که غلظت عناصر سنگین به جز نیکل در عمق اول بیشتر از غلظت آنها در عمق دوم است. نقشه‏های پهنه‏بندی نشان داد که کادمیم، کروم، سرب و روی در نواحی شمالی و نیکل در نواحی جنوبی منطقه غلظت بیشتری دارند. مقایسه نتایج به دست آمده با استانداردهای آلودگی منابع خاک ایران نشان داد که در برخی از نواحی منطقه در دو عمق نمونه برداری شده عناصر کروم، نیکل و روی از میزان استاندارد تخطی داشتند.

 


واژگان کلیدی


فلزات سنگین، آلودگی خاک، زمین‌های کشاورزی، پهنه‌بندی آلودگی

تمام متن:

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