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  • 1 National Center for Scientific Research (CNIC) P.O. Box 6880 10600 Havana Cuba
  • 2 University of Sassari Institute of Mathematics and Physics Italy
  • 3 Laboratori Nazionali di Legnaro Istituto Nazionale di Fisica Nucleare Padova Italy
  • 4 Institute of Oceanology Havana Cuba
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The present work shows a methodology for the application of EDXRF with a X-ray tube, in the analysis of elements in the following matrices: microalgae, marine algae, marine sediments and corals. Various methods were applied: one using a relative external standard, a fundamental parameters method, an absolute method based on elemental sensitivity, a method which used X-ray fluorescence excitation measured in the back side of the sample for low contents heavy elements determination and a TRXRF method. The thin layer samples were prepared using a plastic resin. The analyzed samples of marine algae, marine sediments and corals belong to a marine ecosystem from the North of Havana City, the most affected area by natural metereological phenomena and human impact.