Comparison of photoacoustic spectroscopy, conventional absorption spectroscopy, and potentiometry as probes of lanthanide speciation

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Analytical Chemistry (Washington); (USA)

DOI:https://doi.org/10.1021/ac00202a014· OSTI ID:6725621

Torres, R A; Palmer, C E.A.; Baisden, P A; Russo, R E; Silva, R J ^[1]

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1. Lawrence Livermore National Lab., CA (USA)

The authors measured the stability constants of praseodymium acetate and oxydiacetate complexes by laser-induced photoacoustic spectroscopy, conventional UV-visible absorption spectroscopy, and pH titration. For the spectroscopic studies, changes in the free Pr absorption peaks at 468 and 481 nm were monitored at varying ligand concentrations. The total Pr concentration was 1 {times} 10{sup {minus}4} M in solutions used for the photoacoustic studies and 0.02 M for conventional spectroscopy. For the pH titrations, we used solutions whose Pr concentrations varied from 5 {times} 10{sup {minus}3} to 5 {times} 10{sup {minus}2} M, with total ligand-to-metal ratios ranging from 1 to 10. A comparison of the results obtained by the three techniques demonstrates that photoacoustic spectroscopy can give the same information about metal-ligand speciation as more conventional methods. It is particularly suited to those situations where the other techniques are insensitive because of limited metal concentrations.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6725621
• Journal Information: Analytical Chemistry (Washington); (USA), Journal Name: Analytical Chemistry (Washington); (USA) Vol. 62:3; ISSN ANCHA; ISSN 0003-2700
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ABSORPTION SPECTROSCOPY
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LIGANDS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
PHOTOACOUSTIC SPECTROSCOPY
POTENTIOMETRY
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SPECTROSCOPY
TITRATION