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Heavy metal uptake capacity of Hydrilla verticillata: A commonly available Aquatic Plant

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Author Affiliations

  • 1Department of Chemistry, Gauhati University, Guwahati, INDIA
  • 2 Department of Botany, North Lakhimpur College, Assam, INDIA

Int. Res. J. Environment Sci., Volume 4, Issue (3), Pages 35-40, March,22 (2015)

Abstract

Removal of Cr and Cd by Hydrilla verticillata is influenced by concentration of the metals in the test solution . Uptake was higher at low concentration (15mg/l for Cr and 03mg/l for Cd) and decreased thereafter with increase in metal concentration. Cr accumulation was highest in leaves and roots at the concentration of 15mg/l and 20mg/l respectively. Cadmium accumulation was maximum in 3mg/l in both roots and shoots. The chlorophyll and carotenoid content of test plants revealed gradual decrease with increase in concentration of the test solution. Long term metal exposure affected chlorophyll synthesis which indicates inhibition of photosynthesis as a result of higher metallic concentration. This is a clear indication of disruption of chloroplast, thereby reducing photosynthetic activity. Growth was not affected morphologically except dark brown and necrotic spots treated with the solution, which might be an early symptom of metal toxicity.

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