Summary of Abstract Submission

Abstract Submission No. IO50-03-0064PresentationPoster

USE OF EPR SPECTROSCOPY FOR THE DETERMINATION OF CONCENTRATION AND CHEMICAL FORM OF PARAMAGNETIC METALS IN COASTAL SEDIMENTS

R. Alagarsamy*1, S.R. Hoon2

1 CSIR-National Institute of Oceanography, India
2 Manchester Metropolitan University, United Kingdom

ABSTRACT :

The high sensitivity of the electron paramagnetic resonance (EPR), or Electron Spin Resonance (ESR), technique has been applied to the analysis of surficial sediments from the east and west coasts of India. EPR spectra have been used to study species variation in depositional environments. EPR active paramagnetic species (e.g. Mn and Fe, free radicals different compounds of Fe) have been identified and relative concentrations determined. In many cases that the spectrum of paramagnetic metal ions is unique enabling identification of oxidation state. g-values, line broadening and hyperfine splitting have provided information about the chemical and magnetic environment of the metal. We demonstrate the potential of EPR spectroscopy in the evaluation of the concentration and chemical form of paramagnetic metals in sediments and pollutants from marine shelf environments, which in turn exhibit distinctive EPR spectral ┐fingerprints┐. To our knowledge this is the first study of this kind to present metal ion concentrations in the coastal sediments of India and suggests that EPR combined with AAS-ICP has excellent potential for use in quantitative analysis. Further work studying the effect of microwave power on the saturation pattern of paramagnetic impurities in order to provide information about the interdependence on the centres in the sediments is currently ongoing. Key words: marine, sediment, EPR & pollutants.