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MERCURY CONCENTRATION IN SOME SPECIES OF FRESH WATER FISH OF BANGLADESH

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Mercury concentration in some species of fresh water fish of Bangladesh has been determined by neutron activation

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Journal of National Oceanographic, Atmospheric and Marine Institute
©
NOAMI
Vol.24, No.2, 2007
ISSN: 1027-2119
MERCURY CONCENTRATION IN SOME SPECIES OF FRESH WATER FISH OF
BANGLADESH
A.K.M.Sharif
Bangladesh Atomic Energy Commission, Dhaka-1000, Bangladesh
M.Alamgir, Stanly A.Bajue and Rashed Alam
Department of Physical, Environmental and Computer Sciences
Medgar Evers College, CUNY, NY, U.S.A.
_____________________________________________________________________________________
Abstract
: Mercury concentrations in edible portion of some popular fresh water
fish species, namely,
Tenualosa Ilisha
,
Pangasius pangasius, Septinna phasa, Neopropius atherinoides,Otolithoides pama ,
Puntius sarana
,
Ompok pabda, Sperata aor, Clarias batrachus, Heteropneustes fossil ,Labeo rohita,
and
Catla catla
were determined by radiochemical neutron activation analysis (RNAA). The results were
found to vary from 0.243 to 0.675 μg g
-1
on dry weight, where four species had mercury concentration,
0.243 -0.299 μg g
-1
, six, 0.303-0.384 μg g
-1
and the rest two, 0.536-0.675 μg g
-1
. The results were found
to agree well with other published data on river and marine fishes and within permissible levels accepted
internationally.
Key words
: Mercury, Fish, Radiochemical neutron activation analysis, Bangladesh.
_____________________________________________________________________________________
INTRODUCATION
Mercury is one of the most toxic elements to man and other animals. In the last two decades,
measurement and evaluation of mercury in environment has received much attention. The presence of
high concentration of mercury in river and marine organisms is well–documented (Lee and Hultberg,
1990: Bjorklund
et al
., 1981: Akielazek and Haines, 1981 and Bacci, 1989). Investigatiions of heavy
metals in aquatic ecosystems have been well documented in Europe, Australia and North America, but
few studies are available about the levels of contamination, particularly that of Hg in the fishes from
rivers, and of the Bay of Bengal. Sharif
et al
., (1991, 1993a, 1993b) reported level of few metals
including Hg in some rivers and marine fishes of the Bay of Bengal.
In the rivers and sea, mercury comes mainly from weathering, sewage disposal and industrial wastes.
From discharges of Chloro-alkali industries of Chittagong and Sylhet, through the rivers,the Karnaphuli
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