نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

ارزیابی ژئوشیمیایی و آلودگی عناصر سنگین رسوبات رودخانه رونج واقع در شمال غرب تربت جام

نویسندگان
مجید اطاری
محمد خانه باد
اسداله محبوبی
رضا موسوی حرمی
دانشگاه فردوسی مشهد، دانشکدۀ علوم، گروه زمین‌شناسی، ایران
چکیده
در این پژوهش به بررسی آلودگی رسوبات رودخانه رونج به عناصر سنگین پرداخته شده است. حوضه آبریز رونج به مساحت 131 کیلومترمربع و به شکل کشیده در 20 کیلومتری شهرستان تربت جام (شمال شرق ایران) قرار دارد. به منظور بررسی آلودگی رسوبات به عناصر سنگین، 15 نمونه از رسوبات منطقه برداشت و مورد آنالیز ICP-MS قرار گرفت. به منظور پایش آلودگی رسوبات رودخانه رونج به عناصر سنگین از شاخص غنی شدگی و ضریب آلودگی استفاده شد. کروم با غنی شدگی کم و آهن و نیکل بدون غنی شدگی رفتار ژئوشیمیایی مشابه داشته و از هوازدگی و فرسایش واحد های سنگی اولترامافیک سرچشمه گرفته و آلودگی کم ایجاد کرده است. آرسنیک و سرب آلودگی کم و مس آلودگی متوسط در منطقه دارد. سازند شمشک منجر به تمرکز آلودگی آرسنیک و سرب در ابتدای حوضه آبریز رونج گردیده است. عبور شاخه های فرعی از روی واحد های گرانیتی و تلاقی این شاخه های فرعی در انتهای حوضه آبریز با رودخانه رونج منجر به غنی شدگی بالا و آلودگی مس و سرب در رسوبات انتهای حوضه آبریز گردیده است. شاخص بار آلودگی نیز تمرکز آلودگی در ابتدا و انتهای حوضه آبریز را نشان می دهد که در جهت تایید شاخص های قبلی است.
کلیدواژه‌ها
حوضۀ آبریز رودخانه رونج
آلودگی رسوب
عناصر سنگین
تربت جام

عنوان مقاله English

Geochemical assessment and pollution of heavy elements in the Revenj River sediments in the northwest of Torbat-e-Jam

نویسندگان English

Majid Otari
Mohammad Khanehbad
Asadollah Mahboubi
Reza Moussavi-Harami
Department of Geology, Faculty of Science, Ferdowsi University of Mashhad
چکیده English

In this study, the pollution of the Revenj River sediments with heavy elements has been studied. Revenj River catchment with an area of ​​131 Km2 is located 20 kilometers from the city of Torbat-e-Jam (northeast of Iran). To investigate the contamination of sediments with heavy elements, 15 samples of sediments were taken from the area and analyzed by ICP-MS. In order to monitor the contamination of Revenj River sediments with heavy elements, Enrichment Factor and Contamination Factor were used. Chromium with low eenrichment and iron and nickel with no enrichment have similar geochemical behavior and originate from weathering and erosion of ultramafic rock units and have caused low pollution. Arsenic and lead are low pollution and copper is moderately pollution in the area. Shemshak Formation has led to a focus on arsenic and lead pollution at the beginning of the Revenj River catchment. The passage of tributaries over the granite units and the confluence of these tributaries at the end of the catchment with the Revenj River has led to relatively severe enrichment and contamination of copper and lead in the sediments at the end of this catchment. The pollution load index shows the concentration of pollution at the beginning and end of the catchment area, which is in line with the previous indicators.

کلیدواژه‌ها English

Revenj River catchment
sediment pollution
heavy elements
Torbat-e- Jam
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