Evaluated of mercury concentrations in fish and water in Anzali wetland: A thermodynamic study

سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 670

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شناسه ملی سند علمی:

ISPTC12_006

تاریخ نمایه سازی: 27 شهریور 1393

چکیده مقاله:

Mercury and its organometallic compounds belong to the most toxicsubstances for aquatic ecosystems [1]. It is well known that thetoxicity, the chemical behaviour and the transportation of mercuryin an environment depend on its physico-chemical form In theenvironment, mercury comes from natural and anthropogenicsources. Mercury can be released into the air through geothermalactivity and the weathering of mercury ore-containing rock.Anthropogenic sources of mercury are numerous and worldwide.Anthropogenic sources of mercury, primarily from the combustionof fossil fuels, and incineration of medical and municipal waste.Both the direct drainage of industry wastewater and rainwater runoffleads to mercury contamination in oceans. [2]. The global cycleof mercury involves the emission of Hg° from land and watersurfaces to the atmosphere, transport of Hg° in the atmosphere on aglobal scale, possible conversion to unidentified soluble species, andreturn to land and water by various depositional processes [3].Mercury compounds have also strong tendency to bioaccumulationin aquatic food chains. in marine pollution mercury is potentialthreats to fish, marine mammals, Semi-aquatic animals, birds andattains its highest concentrations in large predatory species at the topof the aquatic food-chain. By this means, it enters the human diet[1],[3]. It is well known that methylmercury is more toxic thaninorganic mercury. The anthropogenic sources of methylmercuryare usually rare, but it is naturally formed in sediments by bacterialmethylation of inorganic mercury [4]. Hence, analysis of sedimentsand fish tissues permits monitoring of mercury levels in water, sincemercury present in contaminated waters is accumulated in bothenvironmental compartments [5].Metallic mercury is oxidized to inorganic mercury in theerythrocytes, by the hydrogen-peroxide catalyse. Mercuric islipophilic and distributed throughout via the bloodstream to alltissues in the body. In muscles, Hg+2 ions have also strong tendencyto bond to sulfhydryl groups of biological macromolecules. Aminoacids of protein molecules are only biological monomers that havesulfhydryl groups. So, Hg+2 ions bond to this group in CysteineAmino acid of different protein muscles tissue in fishes and stored.Significant effort has been made to develop methods for mercurydetermination in environmental and biological samples. Cold vapouratomic absorption spectrometry (CVAAS) is a sensitive andconventional instrumental analytical method used extensively forthis purpose.In this work, total and inorganic mercury concentrations weredetermined in water samples and in muscle tissues of different fishspecies in the aquatic ecosystem Anzali wetland in Gilan. Then, weselected a fish of each species that have highest amount of inorganicmercury and their muscle tissues were digested over 336.15-367.15K range of temperatures at atmospheric pressure. The data obtainedis used to calculate the equilibrium constant as a function oftemperature and enthalpy energy mercuric bond with SH group ofCysteine amino acid of different proteins muscle tissue in thesefishes.

نویسندگان

Elaheh Astani

Chemistry Department, Zanjan University, Zanjan, Iran

Morteza Vahedpour

Chemistry Department, Zanjan University, Zanjan, Iran

Hadi Babaei

Ecology center, Iranian fishing research organization, Anzali, Iran

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