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OBSERVATIONS ON THE RARE EARTHS. LXXV. THE STABILITIES OF DIETHYLENETRIAMINE-PENTAACETIC ACID CHELATES

Journal Article · · Journal of Inorganic and Nuclear Chemistry (England) Merged with Inorg. Nucl. Chem. Lett. to form Polyhedron
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The interaction between diethylenetriaininepentaacetic acid (H/sub 5/ DTPA or H/sub 5/Z) and rare-earth metal ions (Ln/sup 3+/ was investigated. The acid formation constarts of the hydrogen chelates (LnHZ/sup -/) and the formation constants of the normal chelates (LnZ/sup 2-/) were obtained at 10, 20, and 30 deg C, and an ionic strength of 0.1(KNO/sub 3/), the former by a titration technique and the latter by a mercury indicator electrode technique. The data were treated by a least-squares method for evaluation of DELTA H/sup 0/ and DELTA S/sup 0/. Although errors in the functions were substantial, the functions were related to observed trends in stability. The dissociation constants for the last three protons of dietliylenetriaminepertaacetic acid were measured as a function of temperature at ionic strength 0.1(KNO/sub 3/) and converted to thermodynamic functions by least squares analysis. The functions were compared with corresponding values for related chelating agents. (auth)

Research Organization:
Univ. of Illinois, Urbana
NSA Number:
NSA-17-016001
OSTI ID:
4748745
Journal Information:
Journal of Inorganic and Nuclear Chemistry (England) Merged with Inorg. Nucl. Chem. Lett. to form Polyhedron, Journal Name: Journal of Inorganic and Nuclear Chemistry (England) Merged with Inorg. Nucl. Chem. Lett. to form Polyhedron Vol. Vol: 24; ISSN JINCA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ACETIC ACID
ACIDITY
ACIDS
AMINES
BINDING ENERGY
BOUNDARY CONDITIONS
CHELATES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DIFFERENTIAL EQUATIONS
DISTRIBUTION
DTPA
ELECTRODES
ELECTROLYSIS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY
ENERGY LEVELS
ENTHALPY
ENTROPY
EQUATIONS
ETHYLENE
EXCITATION
FERMIONS
FIELD THEORY
GASES
GREEN FUNCTION
HYDROLYSIS
INTEGRALS
INTERACTIONS
IONIZATION
IONS
MANY BODY PROBLEM
MATHEMATICS
MATRICES
MERCURY
MOMENTUM
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
PERTURBATION THEORY
PHOTOLYSIS
POTASSIUM NITRATES
PROTONS
PYROLYSIS
QUALITATIVE ANALYSIS
RARE EARTHS
SHELL MODELS
SOLVENT EXTRACTION
STA