Author/Authors :
Islam, Md. Sirajul Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Rahman, Md. Mazedur Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Kabir, Md. Humayun Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Hoq, Md. Enamul Bangladesh Fisheries Research Institute - Freshwater Station - Mymensingh-2201, Bangladesh , Tamanna Meghla, Nowara Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Suravi Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Al Mamun, Shamim Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh , Sarker, Md. Eusuf Department of Environmental Science and Resource Management - Mawlana Bhashani Science and Technology University - Tangail-1902, Bangladesh
Abstract :
Heavy metal concentrations in water, fish, and sediments from Bangladesh's haor region were
investigated. Fish and sediment samples were taken once a season and evaluated using standard
methods, while water samples were collected monthly. Results showed that metals in water (mg/L)
were found in order of Mn (0.1694) > Cu (0.0189) > Zn (0.0045) > Pb (0.0040) > Cd (0.0028) within
the maximum permissible level of Environment Conservation Rules (ECR). Mean concentrations of
metal in fish (mg/kg–dry wt.) found in order of Zn (56.16) > Cu (25.47) > Mn (4.36) > Pb (2.19) > Cd
(1.27) that were higher than maximum allowable level of Food and Agricultural Organization (FAO)
except Cu. Metal in sediments (mg/kg) found in order of Mn (127.61) > Zn (32.51) > Pb (10.09) > Cu
(5.40) > Cd (0.43), and except Cu all metal concentrations were lower than the Environmental
Protection Agency's (EPA) probable effect concentrations. In water and sediments, pollution indices
revealed a critical pollution threshold for water, and a range of unpolluted to highly polluted for
sediments. Sampling sites had low potential ecological risk, despite the fact that metals were showing
signs of a negative impact on people' health. Furthermore, bio-concentration factor for fish and water
was low to extremely high, but for fish and sediment was low. The level of heavy metal contamination
in haor shows the situation is alarming for biota and residents of the region. The relevant authority
should control and monitor the aquatic ecology in order to protect it.
Keywords :
aquatic environment , heavy metal , health risk , pollution indices , Bangladesh
