بررسی غلظت فلزات سنگین (سرب، کروم، روی، نیکل) در خاک محل دفن زباله شهری سرایان با استفاده از شاخص های آلودگی
محورهای موضوعی : آلودگی خاکمهدی کارگر 1 , قاسم ذوالفقاری 2
1 - کارشناس ارشد علوم و مهندسی محیط زیست، دانشکده علوم محیطی، دانشگاه حکیم سبزواری، سبزوار، ایران. *(مسوول مکاتبات)
2 - دانشیار گروه علوم و مهندسی محيط زيست، دانشکده علوم محيطي، دانشگاه حکيم سبزواري، سبزوار، ایران.
کلید واژه: فلزات سنگین, محل دفن زباله, آلودگی خاک, شاخص های آلودگی. ,
چکیده مقاله :
زمينه و هدف: نحوه تولید زباله های شهری در اکثر مناطق شهری در ایران نگران کننده است. افزایش تراکم جمعیت، صنعتی شدن و میزان زباله های تولید شده، از اهمیت زیادی برخوردار است. ورود فلزات سنگین از طریق زباله های شهری به اکوسیستم های طبیعی، به ویژه خاک ها یکی از مهمترین نگرانی های زیست محیطی است. هدف از این تحقیق، تعیین غلظت برخی از فلزات سنگین ( سرب، کروم، روی، نیکل) در خاک محل دفن زباله شهری سرایان می باشد. روش بررسی: بدین منظور 20 نمونه خاک از محل دفن زباله شهری در سال 1396 جمع آوری گردید و در آزمایشگاه با استفاده از دستگاه جذب اتمی Contraa 700 آنالیز شد. سپس داده ها با تکنیک های آماری و نرم افزارهای Excel و IBM SPSS statistics نسخه 25 مورد تجزیه و تحلیل قرار گرفت. جهت تعیین میزان آلودگی منطقه مورد مطالعه، از شاخص های فاکتور آلودگی (CF) و زمين انباشتگي (Igeo) استفاده گردید. يافته ها: نتایج نشان داد که بیشترین مقدار فاکتور آلودگی مربوط کروم سطحی و کمترین آن مربوط به سرب سطحی است و ميزان شاخص زمين انباشتگي (Igeo) براي فلز کروم بين 1 تا 3 به دست آمد. بحث و نتيجه گيری: با توجه به بررسی های انجام شده فلز کروم در طبقات کمی آلوده و خیلی آلوده و سایر نمونه های جمع آوری شده فلزات در کلاس غیر آلوده تا کمی آلوده قرار گرفته اند.
Background and Objective: Ways to produced urban wastes is concern in most urban areas of Iran. Increasing population density, industrialization and the amount of waste produced are of great importance. The introduction of heavy metals through urban wastewater into natural ecosystems, especially soils, is one of the most important environmental concerns. The purpose of this study is to investigate the concentration of some heavy metals (lead, chromium, zinc, nickel) in the soil of landfill site of Sarayan. Material and Methodology: For this purpose, 20 soil samples were collected from urban landfills and analyzed in a laboratory using Contraa 700 atomic absorption spectrophotometer and then analyzed by statistical techniques and Excel and IBM SPSS statistical software version 25. Finding: To determine the contamination of the studied area, contamination factors (CF) and land accumulation (Igeo) were used and the results showed that the highest amount of contamination was related to surface-level chromium and the lowest was related to surface water and the amount of earthquake index Igeo) was found for chromium metal between 1 and 3. Discussion and Conclusion: According to the study, the chromium metal in the slightly infected and highly infected classes and other samples collected in non-infected classes of metals were slightly contaminated.
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