International Journal of Environment (ISSN: 2186-0009)  

Heavy Metal Pollution and Chemical Profile of Khiru River, Bangladesh
Harunur Rashid, Md. Nazmul Hasan, Mohosena Begum Tanu, Rawshan Parveen, Zahid Parvez Sukhan, Md. Shahidur Rahman and Yahia Mahmud
This study was aimed to determine heavy metals in water, soil sediment and muscles of fish and to evaluate the chemical profile of the water of Khiru River located at Mymensingh, Bangladesh. Samples at fortnight interval were collected from three different locations of the Khiru River. Five fish species, viz., Puntius sophore, Glossogobius giuris, Mystus tengara, Macrognathus aculeatus and Channa punctatus together with water and soil samples, were analyzed for metal concentrations (Cu, Zn, Mn, Pb, Cd, Na, K and As) and for chemical profile of water. Heavy metals bio-accumulation in fish and chemical profile of water were studied for six months and heavy metals in water samples and soil sediments were studied for four months. The concentrations of metals in each sample were determined via Atomic Absorption Spectrophotometry. The concentrations of Cu, Zn and Pb in the water were found within the permissible limit; however, the concentrations of Cd, K and Na were much higher than the permissible limit. Except for Cd, all other metals were found within the permissible limit in the soil sediment. In fish muscle, the highest average bioaccumulation of Cu, Zn, Mn, Pb, Cd, Na, K and As was found to be 3.65 ± 1.04, 106.39 ± 34.93, 27.52 ± 11.27, 0.0016 ± 0.002, 0.0043 ± 0.01111, 3746 ± 2871, 41.62 ± 24.42 and 0.0008 ± 0.0009 mg Kg-1, respectively and within the permissible limit. The average values of dissolved oxygen, total alkalinity, ammonia and nitrate were found to be 1.7 ± 1.07, 269.58 ± 82.08, 3.25 ± 1.53, and 34.59 ± 17.04 mgL-1, respectively at S1, and 2.65 ± 1.21, 245.83 ± 84.50, 3.29 ± 1.36 and 47.23 ± 32.07 mgL-1, respectively at S2 whereas 2.54 ± 1.43, 250.67 ± 89.62, 3.20 ± 1.50 and 29.38 ± 19.08 mgL-1, respectively at S3. The pH values were found to be 8.41 ± 0.64, 7.78 ± 0.39 and 7.96 ± 0.54 in S1, S2 and S3, respectively. Among the different chemical parameters studied, significance difference (p<0.05) in three sampling points of Khiru River was only found in case of pH. In water, the average DO concentration was always found below the acceptable limit among all the points and ranged from 1.7 ± 1.08 to 2.64 ± 1.21 mgL-1. The findings of the present study indicate that due to discharges from industries, the water and sediment of the River Khiru are getting polluted and water quality is deteriorated.
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