مطالعه عناصراصلي و كمياب موجود در خاك بستر رودخانه زاينده رود با استفاده از روش آناليز فعال‌سازي نوتروني

Neutron activation analysis , pro‎mp‎t Gamma Neutron Activation Analysis , trace elements , Zayandeh Rood River , Gamma spectroscopy

The study of main and trace elements in the bed of Zayandeh Rood river using neutron activation analysis method

مهندسي هسته‌اي

Zayandehroud is the largest and most abundant river in the central plateau of Iran, which originates from the central Zagros mountains, especially Zardkoh in Chaharmahal and Bakhtiari provinces, and flows eastward in the central plain of Iran. Finally, it flows into Gavkhoni wetland in Isfahan province. Isfahan province is excellent in terms of agriculture, industry and mining. In fact, in the province, most of the industries, including the extensive Mobarake steel and iron smelting industries, have been established next to Zayandehrud to use river water to cool their devices and equipment. This issue brings risks such as changing the use of agricultural land and as a result reducing agricultural products and most importantly water pollution and as a result the soil of the river bed. Excessive increase in population and today's pattern of industrial activity has caused environmental pollution, especially pollution with heavy metals. Every year, the entry of wastewaters and effluents from factories and industrial units and urban centers into water environments and then the entry of these wastewaters into agricultural lands, as well as the use of poisons and chemical fertilizers that contain heavy metals to fertilize the soil, cause pollution of the environment and agricultural lands. In the present work, determination of the concentration of 28 major and rare elements in 10 soil samples collected from the bed of Zayandehroudriver from the area behind Chadegan dam to Gavkhoni lagoon was done using neutron activation analysis method. Then, the concentration of elements was compared with the data of other rivers and regions, and finally it was determined that the level of arsenic and calcium in the soil of Zayandeh River is almost 3 times their level in the Nile River and the upper continental crust. Since the concentrations of mercury, lead and cadmium elements, which are unnecessary heavy metals, were not detectable by the delayed gamma detection method (NAA). It was decided to use ICP chemical method and PGNAA method to determine their concentration and other elements that cannot be detected by this method.

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چوپان دستجردي، محمدحسين