مقایسه اثر منابع آلودگی خاک بر پذیرفتاری مغناطیسی خاک در کلان شهرها (مطالعه موردی: منطقه 6 تهران)
محورهای موضوعی : ارزیابی خطرات آلاینده ها بر روی محیط زیست
فرناز قبادی
1
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شهرزاد خرم نژادیان
2
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صدرالدین علیپور
3
1 - دانش‌آموخته دکتری محیط زیست، گروه محیط زیست، واحد دماوند، دانشگاه آزاد اسلامی، دماوند، ایران
2 - دانشیار گروه محیط زیست، واحد دماوند، دانشگاه آزاد اسلامی، دماوند، ایران
3 - سازمان مدیریت پسماند، شهرداری تهران، تهران، ایران
کلید واژه: ذرات خاک, فلزات سنگین, آلودگی, محیط شهری, ترافیک,
چکیده مقاله :
آلاینده ها از منابع مختلف به خاک وارد می شوند و بر خواص فیزیکوشیمیایی خاک اثر می گذارند. وجود فلزات سنگین در خاک احتمال ورود آنها به زنجیره غذایی را بالا برده است. منابع صنعتی و حمل و نقل نقش عمدهای در ورود این فلزات به خاک دارند. هدف این پژوهش که در سال 1400 در منطقه 6 شهرداری تهران صورت پذیرفت تعیین ارتباط مابین تجمع فلزات سنگین ناشی از منابع مختلف بر پذیرفتاری مغناطیسی خاک بود. به این منظور 18 نقطه بصورت تصادفی در نقاط مختلف منطقه برای نمونهبرداری انتخاب شد. با استفاده از دستگاه جذب اتمی مقادیر عناصر سنگین کروم، کادمیم، سرب و آرسنیک اندازهگیری گردید. پذیرفتاری مغناطیسی در این نقاط نیز بررسی گردید. بیشترین میزان آلودگی خاک مربوط به عنصر سرب (m mg/kg38) و کمترین مقدار مربوط به کادمیم ( mg/kg04/0<) بود. نتایج نشان داد که بین پذیرفتاری مغناطیسی و چگالي ذرات مواد آلي همبستگی وجود ندارد. پذیرفتاری مغناطیسی با کروم همبستگی نداشت اما با کادمیم و آرسنیک رابطه مستقیم داشت و با سرب رابطه معکوس داشت.
Pollutants enter the soil from various sources and affect its physicochemical properties. The presence of heavy metals in the soil increases the likelihood of their entry into the food chain. Industrial and transportation sources play a major role in the introduction of these metals into the soil. The aim of this study, conducted in 2021 in District 6 of Tehran Municipality, was to determine the relationship between the accumulation of heavy metals from various sources and the magnetic susceptibility of the soil. For this purpose, 18 points were randomly selected across different parts of the region for sampling. The amounts of heavy elements (chromium, cadmium, lead and arsenic) were measured using an atomic absorption spectrometer, and magnetic susceptibility was also assessed at these locations. The highest level of soil contamination was related to lead (38 mg/kg), while the lowest was related to cadmium (<0/04 mg/kg). The results showed no correlation between magnetic susceptibility and the density of organic matter particles. Magnetic susceptibility was not correlated with chromium, but showed a direct relationship with cadmium and arsenic, and an inverse relationship with lead.
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