Nitric acid is widely
used for many applications. However, because
of the large number of nitrogen species and the fact that for concentrations
greater than 10
–2
mol·L
–1
, its dissociation is incomplete in an aqueous medium, nitric media
are very complex to describe especially in temperature. Using data
from the literature and some nitrous acid analyses, it was possible
to determine the balance sheet of all different aqueous nitrogen species
for a total nitric acidity ranging from 1.5 to 8.5 mol·L
–1
and for temperature ranging from 50 to 95 °C
with the assumption that the use of a refrigerant column makes gaseous
species negligible. For this, it was necessary to determine the ionic,
molecular, and solvent activity coefficients and then solve an eight
equation system with nine unknowns by determining one unknown experimentally.
In this study, synthetic copper substituted hydroxyapatite (Cu-Hap), Cu x Ca 10-x (PO 4) 6 (OH) 2 were prepared by co-precipitation method and were used as reactive materials in batch experiments to immobilize uranyl. The limit of incorporation of Cu into a single-phased Cu-Hap reached x Cu 1.59. The synthetic Cu-Hap samples obtained with various Cu contents were contacted with
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