ارزیابی وضعیت آلودگی فلزات با استفاده از شاخص آلودگی نمرو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه محیط زیست، دانشگاه آزاد اسلامی واحد اراک، اراک، ایران

2 دانشیار گروه کشاورزی و منابع طبیعی، دانشگاه آزاد اسلامی واحد اراک، اراک، ایران

3 استادیار گروه محیط زیست، دانشگاه آزاد اسلامی، واحد اراک، اراک، ایران

چکیده

تحقیق حاضر با هدف ارزیابی و پهنه‌بندی وضعیت آلودگی فلزات با استفاده از شاخص آلودگی نمرو (NIPI) در باغ‌های انگور شهرستان ملایر صورت گرفت. براساس روش سیستماتیک تصادفی، 286 نمونه خاک یک کیلوگرمی (همراه با ثبت محل دقیق هر یک از نمونه‌ها با دستگاه GPS) از عمق 20-0 سانتی‌متری و سطح 20×20 سانتی‌متری برداشت و در کیسه‌های پلی‌اتیلنی ذخیره شد و برای بررسی‌های بعدی به آزمایشگاه انتقال یافت. غلظت فلزات منگنز، روی، مس، نیکل، کروم، آرسنیک و جیوه با استفاده از دستگاه اسپکتروفتومتر اندازه‌گیری شد. میانگین غلظت فلزات منگنز، روی، مس، نیکل، کروم، آرسنیک و جیوه به‌ترتیب 597، 109­، 87/86، 84/32، 67/12، 47/1و 0/344 میلی‌گرم در کیلوگرم بود. این مقادیر کمتر از مقادیر شاخص NIPI برای این فلزات بود. این یافته وضعیت نسبی غیرآلودۀ منطقۀ پژوهش را نشان می‌دهد. ارزیابی نقشۀ منطقه‌بندی آلودگی مبتنی بر NIPI و مقادیر کم غلظت فلزات در خاک منطقه و نقشۀ کم‌و‌بیش همگن از توزیع غلظت فلزات ‌موجود در آنها نشان می‌دهد که غلظت فلزات در منطقه توسط فرایندهای زمین‌شناسی کنترل می‌شود. توزیع ناهمگن غلظت فلزات در قسمت‌های کوچک منطقه، تأثیرات انسانی را نشان می‌دهد.

کلیدواژه‌ها

عنوان مقاله [English]

The assessment of metal contamination status using the Nemro integrated pollution index

نویسندگان [English]

  • Ali Ali Yari 1
  • Javad Varvani 2
  • Hamid Toranj Zar 3
  • Ramin Zare 3
  • Amir Hossein Baghaei 3

1 Arak Branch, Islamic Azad University, Arak, Iran

2 َAssociate Professor, Department of Agriculture and Natural Resources, Arak Branch, Islamic Azad University,, Arak , Iran

3 Assistant Professor, Department of Agriculture and Natural Resources, Arak Branch, Islamic Azad University,, Arak , Iran

چکیده [English]

This study aimed to evaluate and zoning the status of metal contamination using the Nemro integrated pollution index (NIPI) in the vineyards of Malayer county. For the study, 286 geolocated soil samples were excerpted based on a random systematic method; each with a weight of 1 kg collected both from a depth of 0-20 cm and a surface of 20 × 20 cm, and then stored in the polyethylene bags to be transferred to the laboratory getting further analyzed. The concentrations of Mn, Zn, Cu, Ni, Cr, As, and Hg were measured using a spectrophotometer; the average concentrations of the sampled metals were respectively 597, 109, 87.86, 84.32, 67.12, 47.1, and 0.344 mg/kg. Based on the results, the measured values were below the NIPI index thresholds for each element remarking the relatively unpolluted condition of the study area. Having evaluated the NIPI-based map in line with low concentrations of the heavy metals in the soil of the study area and a semi-homogeneous distribution of the heavy metals concentration, unfold that the geological processes are the governing factors in controlling the concentration of measured metals. By contrast, human-made changes are mostly responsible for the heterogeneous distribution of metal concentrations in small parts of the region.

کلیدواژه‌ها [English]

  • Pollution status assessment
  • Grapes
  • Environmental risk
  • the Nemro pollution index
  • Malayer
  • Inverse distance weighting
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