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علی افشاری حسین خادمی شمس اله ایوبی

چکیده

مطالعه حاضر با هدف بدست آوردن اطلاعاتی در مورد غلظت و الگوی شیمیایی برخی عناصر سنگین در خاک های اطراف زنجان تحت تأثیر کاربری های اراضی مختلف انجام گرفت. برای این منظور تعداد 241 نمونه خاک سطحی (عمق 10-0 سانتی متر) برداشت گردید که سهم کاربری-های اراضی کشاورزی، مرتع و شهری به ترتیب 137، 77 و 27 نمونه بود. غلظت کل (241=N)، قابل جذب (75=N) و عصاره گیری متوالی (75=N) به ترتیب با روش اسید نیتریک 5 نرمال، DTPA و تسیر انجام شده و با استفاده از دستگاه جذب اتمی قرائت گردید. نتایج نشان داد که غلظت کل سرب، روی، مس و کادمیم در کاربری شهری بالاتر می باشد (به ترتیب میانگین 1/220، 1/399، 9/75 و 47/2 میلی گرم برکیلوگرم). در کاربری شهری میانگین (هندسی) مقادیر قابل جذب عناصر نیز بالاتر از سایر کاربری های اراضی بود و برای روی، سرب، نیکل، مس و کبالت به ترتیب 09/27، 24/27، 11/1، 24/4 و 41/0 میلی گرم برکیلوگرم بدست آمد. کاربری اراضی مختلف تأثیر آشکاری بر توزیع فرم های شیمیایی عناصر گذاشته است. در تمام نمونه های خاک بیشترین درصد کبالت، نیکل و مس در جزء باقیمانده و کمترین مقدار برای کبالت جزء متصل به مواد آلی و برای نیکل و مس جزء تبادلی بود. جزءبندی روی و سرب در کاربری کشاورزی و مرتع تقریباً یکسان است و جزء باقیمانده بیشترین سهم را دارد. در کاربری شهری جزء متصل به اکسیدهای آهن و منگنز، جزء غالب بوده و برای روی و سرب به ترتیب 8/40 درصد و 8/30 درصد مشاهده گردید. جزء باقیمانده در این دو فلز در رتبه دوم قرار داشت.

جزئیات مقاله

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ارجاع به مقاله
افشاریع., خادمیح., & ایوبیش. ا. (2016). تأثیر کاربری اراضی مختلف بر غلظت و الگوهای شیمیایی برخی عناصر سنگین در اراضی مرکزی استان زنجان. آب و خاک, 30(5), 1489-1501. https://doi.org/10.22067/jsw.v0i0.27751
نوع مقاله
علمی - پژوهشی