In
Zanzibar, the major source of food for a large number of populations comes from
the sea like many coastal area residents. The reports show the existence of a
link between seafood and toxic heavy metals in human beings. The aim of this
study was to assess the metal concentration of shellfish along the Sea Port of
Zanzibar. The shellfish include; oysters, mussels, clams and crabs. They were
collected at the Sea Port and the concentrations were determined using Energy
Dispersive X-ray Fluorescence (EDXRF). Concentrations range in clams were Cr
(12.3 -21.1), Mn (235.7 -293), Fe (223.9 9 -242.0), Ni (2.13 -3.30), Cu (47.2 -
48.1), Zn (4271 -5090), Cd (4.43 - 6.61) and As (1.92 - 3.26) µg/g. The range
in crabs were Zn (414.8 -1050), Fe (678.1 - 855.7), Cu (45.4 - 62.6), As (31.16
- 39.47) and Pb (1.20 -1.67) 𝜇g/g. Cd, Cr, Ni, Mn and Zn were
found to be higher in clams while Fe, Pb and Cu were found to be higher in
crabs. In Comparison of the data from this study and that of other regions the
concentration of Cr, Cu, Zn, As and Cd in different shellfish species appears
to be higher than the values reported in the literature. The concentrations of
heavy metals in most different species of shellfish could be attributed to
water from sewage, marine activities, paints and human activities from the
ship.
Author(s) Details
Yusuf Ismail Ally Koleleni
Department
of Physics, University of Dar es Salaam, P. O. Box 35063, Dar es Salaam,
Tanzania and Department of Physics, Muslim University of Morogoro, P. O. Box
1031, Morogoro, Tanzania.
Othman O. Haji
Department
of Physics, University of Dar es Salaam, P. O. Box 35063, Dar es Salaam,
Tanzania.
Please see
the book here:- https://doi.org/10.9734/bpi/mono/978-81-974388-4-4/CH2
No comments:
Post a Comment