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Title: Studies on the dissolution of haematite sol in mixtures containing complexing and reducing agents
Authors: Joseph, Santosh
Venkateswaran, G
Moorthy, P N
Issue Date: Jun-1998
Publisher: NISCAIR-CSIR, India
Abstract: This study deals with the dissolution of monodispersed spherical haematite sol (particle size  ̴130 nm) in a mixture of organic chelating and reducing agents, viz., EDTA, ascorbic acid and citric acid at pH 2.8 at 353 K and evaluation of the dependence of the dissolution rates on the concentration of each of the individual constituents of the mixture. The study based on the 'grain model' shows a linear dependence of dissolution rate on EDTA concentration; in the case of citric acid the concentration dependence is not linear but tends to level off at concentrations above 33 mol m-3. The dissolution rate decreases as ascorbic acid concentration is increased from 11 - 22 mol m-3 and reaches a limiting value with further increase in ascorbic acid concentration.
Page(s): 525-530
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.37A(06) [June 1998]

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