The Behaviour of 134Cs, 60Co, and 85Sr Radionuclides in Marine Environmental SedimentReportar como inadecuado




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TheScientificWorldJOURNAL - Volume 2 2002, Pages 1514-1526

Short Review Radiation Protection Department, Nuclear Research Center, Atomic Energy Authority, P. O. Box 13759, Cairo, Egypt

Received 29 November 2001; Revised 8 February 2002; Accepted 5 April 2002

Copyright © 2002 Nariman H.M. Kamel.

Abstract

This work describes experimental investigations and modelling studies on the sorption of radionuclides

Cs,

Co, and

Sr by certain marine sediments within Egypt. The chemical composition of the marine sediments was determined. The soluble salts were measured for the sediments and the concentrations of the released cations, Al

, Fe

, and Si

, were measured for the sediment materials in 0.1 M NaClO4 aqueous solution at different hydrogen ion concentrations. The two main factors that control the uptake of the radionuclides onto the sediment are the pH and the exchangeable capacities of the sediment materials. Surface complex model was used to estimate the surface charge densities and the electric surface potential of the marine sediment materials. These two parameters were calculated at the surface capacity sites of the sediment materials. The desorption of the adsorbed cations was determined by means of selective consecutive extraction tests using different chemical reagents including 1 1 M MgCl2 pH 7, 2 1 M ammonium oxalate pH 3-5, 3 0.04 M NH2OH,HCl in 25% acetic acid pH 3-4, 4 H2O2 in 5% HNO3pH 2-3, and 5 digestion with nitric acid followed by hydrofluoric and perchloric acids pH 2.





Autor: Nariman H.M. Kamel

Fuente: https://www.hindawi.com/



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