"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Surface-analytical and EPR studies on sediment samples in Herăstrău Lake, Romania

E. D. SELEŢCHI1,* , C. NEGRILĂ2, O. G. DULIU1, C. V. ŢURCAŞ3

Affiliation

  1. University of Bucharest, Department of Atomic and Nuclear Physics, Măgurele, Romania
  2. National Institute of Research and Development for Materials Physics, Bucharest, Romania
  3. University of Bucharest, Faculty of Chemistry, Bucharest, Romania

Abstract

X-Ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) have been used to investigate the elemental composition, chemical and electronic state of elements that exist within the Herastrau Lake (Bucharest, Romania) sediments. XPS spectra were obtained by irradiating the sediment samples with an Al source of X-rays (1486.6 eV). C, N, O, F, Na, Mg, Al, Si, S, Cl, K, Ca, V, Mn, Fe, Co, Ni, Cu, Zn, and Pb have been determined by XPS and AES techniques. The analysis of Electron Paramagnetic Resonance (EPR) spectra revealed an additional free radical peak in the center of Mn2+ sextet, at a g = 2.0038, attributed to − SO3 species as well a very intense and broad signal due to Fe3+ ions..

Keywords

XPS, AES, EPR, Binding energy, Gyromagnetic factor, Free radical.

Submitted at: May 30, 2007
Accepted at: Sept. 18, 2007

Citation

E. D. SELEŢCHI, C. NEGRILĂ, O. G. DULIU, C. V. ŢURCAŞ, Surface-analytical and EPR studies on sediment samples in Herăstrău Lake, Romania, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2949-2953 (2007)