International Journal of Environmental Sciences

Volume 4 Issue 4 2014- January 2014    Pages: 605-613  <<Previous    Next>>

Determination of ultra trace Uranium in Lichen by Adsorptive-Cathodic Stripping Voltammetric Technique

Author Information:

Sabyasachi Rout, Manish K. Mishra, Ajay Kumar, Pazhayath Mana Ravi
Health Physics Division, Bhabha Atomic Research Centre, Mumbai, India

ABSTRACT

Cathodic Stripping Voltammetric (DPAdCSV) method was optimized and validated for the determination of uranium (U) in lichen using choranilic acid (CAA) as complexing agent. The complex can be used for a selective and ultra-trace determination of 'U' by adsorptive cathodic stripping voltammetry (AdCSV) using a hanging mercury drop electrode (HMDE) as working electrode. The method was validated by generating data on parameters such as linearity, precision, accuracy, sensitivity, method detection limit (MDL), quantitation limit (LQ) and selectivity. Experiments were also carried out to study the influence of effective parameters such as pH, concentration of CAA, deposition potential, deposition time and sweep rate on the sensitivity and selectivity of method. The validation data demonstrate that DPAdCSV is a viable alternative technique to current methods which enables quantitative analysis of uranium in environmental samples like lichens with MDL and LQ of 0.35 µg L-1 and of 1.0 µg L-1 respectively. The case study carried out at Mumbai suburban, India revealed that, level of uranium in lichen at this area varies from 36.2 to 62.8 µg Kg-1.

Keywords: Cathodic adsorptive stripping voltammetry, Uranium, Chloranilic acid, Lichen

.DOI:10.6088/ijes.2014040400015

© 2014 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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