بررسی غلظت فلزات‌سنگین (آرسنیک، کادمیوم، کبالت، کروم و نیکل) در خاک منطقه ده نو شاندیز

نوع مقاله : مقالات پژوهشی

نویسنده

استادیار، گروه زمین‌شناسی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران.

چکیده

چکیده:
زمینه وهدف : امروزه آلودگی خاک به فلزات­ سنگین به­عنوان یکی از مهمترین آلاینده­ ها محسوب می­شود و از نظر سمیت و پایداری جز خطرناک­ترین گروه طبقه­ بندی شده­اند و به­دلیل خصوصیات آلایندگی­ شان در خاک، سمی بودن، زمان ماندگاری بالا و تجمع آنها در بافت جانداران، از اهمیت اکولوژیکی و بیولوژیکی زیادی برخوردارند. مطالعه حاضر با هدف بررسی نحوه پراکنش و توزیع فلزات سنگین در خاک منطقه ده­نو شاندیز (شمال غرب مشهد) انجام شد.
مواد و روش­ها: در این تحقیق 20 نمونه خاک از عمق صفر تا 30 سانتی­متری جمع­ آوری گردید و غلظت کل عناصر آرسنیک، کادمیوم، کبالت، کروم و نیکل با استفاده از دستگاه اسپکتروفتومتر جذب اتمی اندازه­گیری شد. برخی از ویژگی­های خاک شامل PH،  درصد کربن، ظرفیت تبادل کاتیونی و بافت خاک نیز در نمونه­ها اندازه­گیری گردید. تجزیه و تحلیل داده­ها با استفاده از نرم افزار آماری spss ، ورژن 7/2 انجام شد.
یافته­ها: بر اساس نتایج حاصل از اندازه­گیری میزان غلظت فلزات­سنگین، میانگین غلظت آرسنیک، کادمیوم، کبالت، کروم و نیکل در منطقه مورد مطالعه به­ترتیب 10/87،  0/26،  14/8،  56/6 و 2/68میلی­ گرم بر کیلوگرم بود. همچنین براساس نتایج حاصل از آنالیز آماری انحراف­معیار و میانگین فلزات آرسنیک، کادمیوم، کبالت، کروم و نیکل در منطقه مورد مطالعه به­ترتیب 1/97،  0/16، 1/32، 19/47 و 17/39 بود.
نتیجه­ گیری: غلظت نیکل در خاک­های منطقه نسبت به میانگین استاندارد سازمان حفاظت محیط­زیست ایران بالاتر و غلظت کروم، کبالت، کادمیوم و آرسنیک نسبت به میانگین این استاندارد پایین­تر است. وجود خاک­ های سرپانتینیتی، سبب افزایش غلظت عنصر نیکل در منطقه شده است.
نوع مقاله : مقاله پژوهشی

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of soil heavy metals concentrations (As, Cd, Co, Cr and Ni) in region Dehnov Shandiz

نویسنده [English]

  • Mohammad ebrahim Fazel valipour
1- Associate Professor, Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
چکیده [English]

Abstract
Background and Aim: Heavy metals contamination of soils is one of the main environmental problems. Heavy metals are considered as one most dangerous groups of pollutants because of their toxicity and stability. The biological and ecological importance of heavy metals is due to their characteristics of polluting, their toxicity, persistence and bioaccumulation. The aim of this study was to investigate the spatial distribution of heavy metals in region Dehnow Shandiz (North West of mashhad).
Materials and Methods: In the present study, 20 soil samples (10-30 cm depth) collected and total concentration of As, Cd, Co, Cr and Ni were measured using Atomic absorption spectrophotometer device. Also, some other soil properties including PH, Organic carbon, CEC and soil texture proportions were measured.
Results: The results showed that the average concentrations of As, Cd, Co, Cr and Ni in the study area were 10.87, 0.26, 14.8, 56.6 and 68.2 mg/kg respectively. Also the results of statistical analysis showed that the standard deviations of As, Cd, Co, Cr and Ni in the study area were 1.97, 0.16, 1.32, 19.47 and 17.39 respectively.
Conclusion: The results indicate that the average concentration of Ni in the soil of study area were higher than the standard of the Environmental Protection Organization of Iran and As, Cd, Co and Cr were lower than the standard. The presence of serpentinite soils has increased the concentration of nickel in the region.
Document Type: Research article

کلیدواژه‌ها [English]

  • Dehnov Shandiz
  • Mashhad
  • Soil pollution
  • Heavy metals
  • Spatial distribution
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