Record Details

Measurement of thickness of surface layer of the labile component of thorium and uranium present on marine sediment particle surface

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Measurement of thickness of surface layer of the labile component of thorium and uranium present on marine sediment particle surface
 
Creator Joshi, L.U.
Ganguly, A.K.
 
Description 59-63
Surface of sediment particles covered with organic matter contain thorium and uranium in labile chemical form. Such labile components can be removed by destroying the organic matter on the sediment particles with phosphate-free hydrogen peroxide in presence of 0.05 M hydrochloric acid and by many leaching agents. In the dynamic processes in the coastal environment chemical equilibria of the labile components are established between the surface of the particles and the ambient sea water. Particle size distribution for various marine sediment samples collected from the west coast of India has been determined. From these data, surface areas of particles (assumed spherical) participating in the physicochemical processes at the particle water interface have been calculated. Densities of particles with and without organic matter have been determined pycnometrically. The organic matter which is mainly humic and fulvic acids, has been extracted from the sediments and the density of the organic matter determined pycnometrically. An attempt is made to estimate the mean thickness of the surface layer participating in the leaching and equilibrium processes, wherein the disequilibrium of natural radioactive elements has been observed earlier by the authors. Thickness of the surface layer of the labile component of thorium and uranium in freshly powdered monazite mineral sand (for the surface
of a dense material completely free of organtc matter) is 1·13x 10-6 and 1·60x 10-6 cm respectively. Thickness of the labile organic layer of the coastal sediment particles is in the range 2·5x 10-6 to 10x 10-6 cm.
 
Date 2016-12-30T04:47:53Z
2016-12-30T04:47:53Z
1977-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/39345
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.06(1) [June 1977]