Spectrophotometric, potentiometric, and gravimetric determination of lanthanides with peri-dihydroxynaphthindenone

Journal Article · Mon Feb 01 04:00:00 EST 1982 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00239a019· OSTI ID:5582873

Hassan, S S.M.; Mahmoud, W H

Sensitive and reasonably selective methods are described for the spectrophotometric, potentiometric, and gravimetric determination of lanthanides using peri-dihydroxynaphthindenone as a novel chromogenic and precipitating reagent. The reagent forms a stable 1:2 (metal:reagent) type of complex with light lanthanides at pH 2-7 in 1:1 ethanol-water mixture. Low metal concentrations (<10 ..mu..g/mL) develop colored species (lambda/sub max/ 580 to 590 nm, epsilon/sub max/ (4-6) x 10/sup 4/ L mol/sup -1/ cm/sup -1/) which obey Beer's law. Quantitative precipitation of the complexes from metal solutions of concentrations > 100 ..mu..g/mL permits both gravimetric quantitation by igniting the precipitates to the metal oxides and potentiometric titration of the excess reagent. Results with an average recovery of 98% (standard deviation 0.7%) are obtainable for 0.1 ..mu..g to 200 mg of all light lanthanides. Many foreign ions naturally occurring or frequently associated with lanthanides do not interfere or can be tolerated.

• Research Organization: Ain Shams Univ., Cairo, Egypt
• OSTI ID: 5582873
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 54:2; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical &amp; Spectral Procedures
400104* -- Spectral Procedures-- (-1987)
CHELATING AGENTS
CHEMICAL ANALYSIS
ELEMENTS
GRAVIMETRIC ANALYSIS
METALS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTHS
REAGENTS
SPECTROPHOTOMETRY
TITRATION