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Trace Element Concentrations Present in Five Species of Freshwater Fish of Bangladesh

M. Nurul Amin
Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka 1000, Dhaka

A. Begum
Department of Zoology, University of Dhaka, Dhaka 1000, Dhaka and

M. G. Kibria Mondal
Department of Chemistry, Jagannath University, Dhaka, Bangladesh.

Abstract/ Executive Summary:

In the present study, the edible portions of whole fish excluding viscera and bone of five different freshwater fish species samples are analyzed for lead, manganese, nickel, zinc, copper and iron by atomic absorption spectrophotometry (AAS). The relative standard deviations (RSD) were found below 5%. The accuracy of the methods was confirmed by certified reference materials. The concentrations of trace elements in the edible portions of other fish comply with the international standards for human consumption.

Keywords: Trace element; Gumti river; Freshwater fish; Atomic absorption spectrophotometry (AAS); Metal contamination

Location:

Start Date: 01-05-2005

End Date: 03-05-2006

Program Area: Resource Development and Management

Commodity: Carp fish

Objectives:

To study the Trace Element Concentrations Present in Five Species of Freshwater Fish of Bangladesh

Methodology:

Sample collection: The freshwater fish species were sampled in May 1, 2005 and May 3, 2006 by a professional fisherman at two stations (Gumti river), located in Daud Kandi, Comilla. Although a variety of freshwater fish species inhabits this river, the generally edible ones, Corica soborna (Kachki), Clupisoma pseudeutropius atherinoides (Batashi), Gudusia chapra (Chapila), Trypauchen vagina (Lal-Cheu) and Mystus vittatus (Tengra), were chosen for the present work. The fish samples were put in plastic bag/containers and transported to the laboratory on the same day. The internal organs, headsand tails of fish, which people do not consume, were removed and the edible portions (muscle) were washed with distilled water. After cutting into small pieces with a cleaned stainless steel knife, the small pieces were cleaned several times with demineralized pure water. The samples wereChemical analysis Accurately weighted fish samples (about 2 g) were treated with 10 ml of 14 M nitric acid, 5 ml of 13 M perchloric acid and 5 ml of demineralized pure water in a Teflon decomposition vessel. The vessel was put in a stainless steel container and heated for 2 h at 150^oC in an electric oven. After decomposition, the solution was evaporated down to about 5 ml in a Teflon beaker by heating with a hot plate. Finally, the solution was transferred to a 100 ml volumetric flask and diluted to volume with demineralized pure water. The elemental concentrations in the solution were measured with a Pye Unicam SP-2900 flame atomic absorption spectrophotometer. The standard solutions were prepared in 0.1 N perchloric acid. dried in an oven at 65

^oC for 48 h and were homogenized with a mortar. The powdered samples were dried again at 105^oC in the oven to a constant weight. Finally, the fine samples were preserved in clean and dry polyethylene bottles

Source of Information: Bangladesh J. Sci. Ind. Res. 46(1), 27-32, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The relative standard deviations (RSD) were found below 5%. The accuracy of the methods was confirmed by certified reference materials. The concentrations of trace elements in the edible portions of other fish comply with the international standards for human consumption..

Knowledge Management: Journal