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Copper Contamination of Different Prawn Farms at Shatkhira District

M.A . Ali
Department of Aquaculture, Patuakhali Science and Technology University

M. A. Sattar
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh

M. A. Baten
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Copper (Cu) contamination of six prawn farms under three upazilas of Satkhira district were evaluated. Total 54 water, sediment and prawn samples were collected from six farms, 18 samples from each category were examined to observe the Cu contamination of water, sediment and prawn. Cu was determined by Atomic Absorption Spectrophotometer at the central laboratory of Bangladesh Agricultural University and toxicity laboratory of Bangladesh Fisheries Research Institute, Mymensingh. The levels of Cu in water sample, sediment sample and samples of prawn species were collected from different surface and ground sources. The concentration of Cu in sediment samples were ranged from 45.3895 to 127.8771 μg^-1 and the average mean concentration was 76.92101 μg^-1. The concentration of Cu in prawn was ranged from 16.1069 to 97.3841 μg^-1 and the average mean concentration was 51.2342 μg^-1. The copper concentration in water ranged from 0.0309 to 0.0702 ppm. Cu concentrations in those samples were higher in sediment than prawn, but very lower concentration was found in water sample. The Cu in sediment samples were present higher amount than allowable limit. So prawn was mostly affected by contaminated water and sediment.

Keywords: Copper (Cu), Contamination, Water, Sediment, Prawn

Location: The experimental area was Shatkhira district

Start Date: 15-12-2006

End Date: 21-05-2007

Program Area: Risk Management in Agriculture

Commodity: Contamination

Objectives:

1. To observe the variation of Cu contaminations.

Methodology:

Description of the study area - The experimental area was Shatkhira district. Water, sediment and prawn samples were collected from six different farms. These farms were situated at three upazilas of Shatkhira district. These upazila were Sadar upazila (Farm A and Farm B), Debhata upazila (Farm C and Farm D) and Kaligonj upazila ((Farm E and Farm F). These samples were also collected to observe the variation of Cu contaminations. Total 54 samples were collected (water sample- 18, sediment sample-18 and prawn sample-18). The analysis of water samples were conducted at Bangladesh Agricultural University and Bangladesh Fisheries Research Institute, Mymensingh during the period from 15 December 2006 to 21 May 2007. Sediment - Eighteen sediment samples were collected from different farms at Shatkhira district by Ekman dredge and kept in fresh plastic packets. The samples were shade dried and sieved through 80-mesh after grinding. Water - Water samples were collected in 100 ml plastic bottles previously cleaned with dilute hydrochloric acid followed by the distilled water (1.1). After collection of wetland water samples, all bottles were brought to the laboratory. The water samples were filtered with filter paper (Whatman No. 1) to remove undesirable solid and suspended materials. Prawn - Tissue was taken out from prawn samples. Approximately 50 g of sample was drawn out. The collected tissue was immediately kept in ice in a thermos to maintain temperature of about 0⁰C. From collected tissues 3 to 5 g samples were taken out and 25.5 ml of triacid mixture (21 ml HNO₃: 3 ml HClO₄: 1.5 ml H₂SO₄) was added. The content were mixed and left over night. Sample was then digested, initially at low temperature and later at 150⁰C for 2 hours. Determination of heavy metal content - Cu was determined by Atomic Absorption Spectrophotometer (AAS, UNICAM 969) at the central laboratory of Bangladesh Agricultural University and toxicity laboratory of BFRI, Mymensingh (Model AAS, BUCK Scientific).

Source of Information: J. Environ. Sci. & Natural Resources, 4(2): 105-109, 2011; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The concentration of Cu in sediment samples were ranged from 45.3895 to 127.8771 μg^-1 and the average mean concentration was 76.92101 μg^-1. The concentration of Cu in prawn was ranged from 16.1069 to 97.3841 μg^-1 and the average mean concentration was 51.2342 μg^-1. The copper concentration in water ranged from 0.0309 to 0.0702 ppm. Cu concentrations in those samples were higher in sediment than prawn, but very lower concentration was found in water sample. The Cu in sediment samples were present higher amount than allowable limit. So prawn was mostly affected by contaminated water and sediment.

Knowledge Management: Journal