Studies on some divalent metal α-isosaccharinic acid complexes

2006 ◽  
Vol 94 (6-7) ◽  
Author(s):  
Peter Warwick ◽  
Nick Evans ◽  
Sarah Vines
Keyword(s):  
Radioactive Waste ◽  
Metal Ions ◽  
Stability Constants ◽  
Detrimental Effect ◽  
Divalent Metal ◽  
Intermediate Level ◽  
Divalent Metal Ions ◽  
Organic Complexes ◽  
Intermediate Level Radioactive Waste ◽  
Isosaccharinic Acid

SummaryThe presence of organic complexants, such as α-isosaccharinic acid (ISA) in an intermediate-level radioactive-waste (ILW) repository may have a detrimental effect on the sorption of radionuclides by forming organic complexes in solution. To assess this, stability constants are required for the complexes formed. Constants have been determined for the divalent metal ions, Cd

scholarly journals Studies on Metal Gluconic Acid Complexes

2006 ◽  
Vol 932 ◽  
Author(s):  
Peter Warwick ◽  
Nick Evans ◽  
Sarah Vines
Keyword(s):  
Radioactive Waste ◽  
Stability Constants ◽  
Gluconic Acid ◽  
Detrimental Effect ◽  
Solubility Product ◽  
Salt Formation ◽  
High Ph ◽  
Organic Complexes ◽  
The Stability ◽  
Intermediate Level Radioactive Waste

ABSTRACTThe presence of organic complexants, such as gluconic acid, in an intermediate-level radioactive-waste (ILW) repository may have a detrimental effect on the sorption of radionuclides, by forming organic complexes in solution. In order to assess this, stability constants are required for the complexes formed with radionuclides at high pH. This study reports the stability constants for the reactions of some divalent metals with gluconic acid (Gl). The metals studied were Cd, Co, Fe(II), and U(VI) at pH 13.3; and Co and U(VI) at pH 7. The constants were measured by the Schubert (ion-exchange) or solubility product methods. Stoichiometries of the complexes were also determined. At pH 7 each complex was of the form M1Gl1, with log β values suggestive of salt formation. At high pH, log β values were between 13 and 20. The constants have enabled speciation calculations to be performed showing the effect of gluconic acid on the metal's solubility, with data for Ni included. Solubility is predicted to increase in the presence of Gl from pH 9 to 13.5, suggesting that it may have an impact on radionuclide behaviour. The largest solubility increases are for Cd and Co, the smallest, U(VI).

Stability constants and spectral studies of complexes of 2-hydroxy-5-methylazobenzene-2′-carboxylic acid with some divalent metal ions

1984 ◽  
Vol 62 (11) ◽  
pp. 2299-2301
Author(s):  
C. Mahalingam ◽  
J. K. Sthapak ◽  
D. D. Sharma ◽  
R. L. Tiwari ◽  
Smita Sthapak
Keyword(s):  
Carboxylic Acid ◽  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Divalent Metal ◽  
Reflectance Spectra ◽  
Spectral Studies ◽  
Divalent Metal Ions ◽  
The Stability

The stability constants of metal complexes of 2-hydroxy-5-methylazobenzene-2′-carboxylic acid have been determined spectrophotometrically. These follow the Irving–Williams sequence: log KOH(H) = 10.67, log K1(Co) = 9.02, log K1(Ni) = 9.68, log K1(Cu) = 13.37, log K1(Zn) = 7.58, and [Formula: see text]The chelates of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and [Formula: see text] with the dye have been prepared and characterized on the basis of their ir and reflectance spectra.

Sign in / Sign up

Export Citation Format

Share Document