Abstract
Mercury is a heavy
metal that presents in the earth’s crust and it is methylated by
bacteria in aquatic environments to methyl mercury (MeHg) in
anaerobic conditions. It is then concentrated by the food chain so
predatory fish and other seafood animals may have the highest
levels. Thus, consuming fish and other seafood lead to human
exposure. In this study, mercury metal level was
measured in 90 fish samples and 18 canned tuna fish
available in the market in mashhad city. After collection,
digestion and preparation of samples, level of mercury metal was
determined by hydride generation atomic absorption
spectrophotometery and the metal content, expressed in µg g-1 wet
weight. The results of this study indicate that About 52% of
the total fish samples analyzed had Hg levels above 0.5 ppm. The
highest Hg levels were noted in Fila Coli caught in waters
surrounding Persian Gulf (2.04±1.23 µg g-1 dry weight). and
the lowest were noted in Common carp and Salmon
caught in waters surrounding Caspian sea, 0.24+0.24 µg g-1
and 0.25+0.08 µg g-1 , respectively. Also, except four
sampels, the all of canned tuna fish have
concentrations well below the permissible FAO/WHO levels for this
toxic metal. however, These findings suggest that exposure to MeHg
is widespread and
that men may be a
previously unrecognized high risk population.
فهرست مطالب:
فصل اول / جیوه و تجمع آن در
ماهیه
فصل دوم / منابع و سرانه مصرف ماهی
در ایران
فصل سوم / روشهای اندازه گیری فلزات
سنگین
فصل چهارم / مواد و
دستگاهها
فصل پنجم / روش کار
فصل ششم / نتایج
فصل هفتم / بحث
جهت دانلود اینجا کلیک کنید
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آزمون های تاپ ناچ top notch complete assessment test
دانلود گلچین نوحه و مداحی محرم با نوای سیدمهدی میرداماد
مدل دکوراسیون دیوار پشت تلوزیون شیک و زیبا
عکس ستارگان مطرح هالیوود کاندیدای حضور در نقش های مولانا و شمس تبریزی
آموزش زبان در خواب به کمک ضمیر ناخوداگاه:اورجینال