Heavy Metals Concentration at Different Tannery Wastewater Canal of Chittagong City in Bangladesh

摘要

Industrialization and urbanization grow up the development of any country. Chittagong, the second largest city of Bangladesh, is suffering a great deal for water pollution problem. Various types of compound contaminated with heavy metals or heavy metals compound are conventionally used in different industry. Wastage from the industries is finally discharged into different surface water body without treatment creating pollution. Our investigation was carried out to evaluate the status of heavy metal in the different canal of Chittagong City. Concentration of Cu, Mn, Zn, Pb, Ni, Co, Ag Fe, Cd, Al and Ag were determined by Atomic Absorption Spectrophotometer (AAS). In all canals Pb contents were higher than the standard limit of Environment Conservation Rules 1997. Pb concentration of Hamzerbagh canal was the highest (8.03 mg/ml) of all and second highest was Mirzapol canal i.e. 7.777 mg/1. Cr content that found to very much higher in the two canals near from Kulgoan (Tannery Bottal) area were 23.73 mg/ L and 10.45 mg/L. Fe concentration of sample, collected from Muradpur canal, Hamzerbag canal and Mirzarpol canal found higher than the standard limit were 7.95,4.94 and 4.41 respectively. High concentration of Pb, Cr and Fe were found also higher thanthe standard limit indicating imperiled state of canal water of Chittagong City.