Assessment of Heavy Metal Residues in Water, Sediment and Fish tissues from Hebbal Lake, Bengaluru-India

Livi Wilson; H.R.V. Reddy; Gangadhara Gowda; K. N. Prabhudeva; Shrikrishna Isloor; N. B. Shridhar; Sanal Ebeneezar; N. Chethan; A. Padmanabha; K. Muttappa

Volume : V, Issue : IX, September - 2016

Assessment of Heavy Metal Residues in Water, Sediment and Fish tissues from Hebbal Lake, Bengaluru-India

Livi Wilson, H. R. V. Reddy, Gangadhara Gowda, K. N. Prabhudeva, Shrikrishna Isloor, N. B. Shridhar, Sanal Ebeneezar, N. Chethan, A. Padmanabha, K. Muttappa

Abstract :

In the present study, we aim to determine the concentrations of metals such as Zn, Fe, Cu, Ni, Pb and Cd in the water, sediment and tissues (liver, muscle and gill) of rohu, Labeo rohita which was obtained from Hebbal Lake. The mean residual concentration of heavy metals analyzed was found to be highest in all the sediment samples. Accumulation of metals in the samples was in the order of sediment > water > fish tissues. The mean residue level of heavy metals in the sediment (mg/Kg) and water samples (mg/L) were in the order of Fe (93.360 � 0.007) > Zn (76.310 � 0.061)> Cu (69.160 � 0.98)> Pb (13.870 � 0.34)> Ni (11. 650 � 0.94) and Fe (0.480 � 0.007)> Zn(0.301 � 0.005)> Pb(0.10 � 0.008)> Cu(0.020 � 0.012) respectively. The order of heavy metal residue in various organs was liver > gills > muscle. The mean concentration of heavy metals (mg/Kg) in the liver and gill samples was in the order of Zn (1.087 � 0.002)> Fe (0.785 � 0.07)> Cu (0.178 � 0.086) >Ni (0.065 � 0.002) and Fe (0.198 � 0.003)> Zn (0.160 � 0.066)> Cu (0.087 � 0.004)>Ni (0.071 � 0.007) respectively. Fe (0.239 � 0.016) and Zn (0.075 � 0.011) were present in muscle samples but Cu, Ni, Pb and Cd were not detected. Heavy metal residues in edible part (muscle) of fish were within the permissible level and were safe for the human consumption. However the results clearly illustrate the biomagnification effect of metals in Hebbal lake.