Selective two-step titration of thorium by sulfate displacement of the diethylenetriaminepentaacetic acid complex

Technical Report · Tue Jul 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/5224715· OSTI ID:5224715

Kiefer, P

Thorium and other metals are complexed with excess diethylenetriaminepentaacetic acid (DTPA) at pH 1.4, the excess DTPA is titrated with Bi(III) to a xylenol orange end point, sulfate is added to complex Th(IV), and the displaced DTPA again is titrated with Bi(III). Of 61 metal ions and nonmetal anions tested, only Ga(III), Sc(III), tungstate, citrate, oxalate, and thiosulfate interfere seriously. Lesser interferences are In(III), Zr(IV), V(IV), and permanganate. The standard deviation is 2 ..mu..g for 56 to 840 ..mu..g Th.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5224715
• Report Number(s): LA-8349
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ACTINIDE COMPLEXES
ACTINIDES
AMINO ACIDS
BISMUTH COMPOUNDS
CARBOXYLIC ACIDS
CHELATING AGENTS
COMPLEXES
DRUGS
DTPA
DYES
ELEMENTS
INDICATORS
INTERFERING ELEMENTS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
RADIOPROTECTIVE SUBSTANCES
RESPONSE MODIFYING FACTORS
SULFATES
SULFUR COMPOUNDS
THORIUM
THORIUM COMPLEXES
TITRATION
XYLENOL ORANGE