Abstrakt

Assessment of Bioaccumulation of Metal by Typha Latifolia Growing on Ash Pond of Koradi Thermal Power Station

Surjyoti S. Bagchi

Typha latifolia L. is a dominant species grown on ash pond as well as overflow weir of the ash pond of Koradi thermal power sta tion. The assessment of metal bioaccu mulation is essential for effective bioremediation. The study was focused on the estimation of the metal uptake by the naturally growing Typha species and calculation of transloca tion factor (TF) of each metal. TF values were found to be lower than 1, exception occurred only in case of Mn (TF > 1). The phytoavailability of the metal from the sediments for the root part can be assessed by a simple index termed as Enrichment coefficient for roots (ECR). ECR values were lower than 1, except in case of Zn. The average concentration of copper in the pond ash sediments are found to be 49.67 mg/Kg. The concentration of bioavailable Cu were found to be higher in root portions of T. latifolia L . (22.3 mg/Kg) and in the plant sy stem (13.3 mg/Kg). The total Mn concentration in pond ash sediments was found to be 532.77 mg/Kg. Maximum Mn concentration was found in the shoot portion -313.8 mg/Kg, followed by the root system -189.1 mg/Kg. Iron is the most abundant element found in pond ash; its average concentration is found to be 45239 mg/Kg. Uptake of metal in the root portion of T. Latifolia L. is greater than in the shoot po rtion -19196 mg/Kg in root and 166 mg/Kg in shoot. In the present study, the highest concentration of Zn was found in the root portion of T. Latifolia L. (202.4 mg/Kg), followed by the shoot portion with 72.3 mg/Kg, and a concentration of 169.98 mg/Kg of zinc was found in ash pond sediments.