POTENTIOMETRIC TITRATIONS WITH (ETHYLENE-DINITRILO) TETRAACETATE. USE OF MASKING AGENTS TO IMPROVE SELECTIVITY

Journal Article · Fri Aug 01 04:00:00 EDT 1958 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

OSTI ID:4325006

Fritz, J S; Richard, M J; Karraker, S K

Potentiometric titration of metal ions with EDTA using a mercury metal indicator electrode is a useful but rather nonselective method. Complexing agents mask certain interfering metal ions to allow inieresting and selective analytical determinations. With citrate as a masking agent, cadmium(II), copper(II), mercury(II), or zinc(II) can be titrated in the presence of beryllium(II), chromium(III), iron(III), molybdenum(VI), niobium(V), antimony (III), tin(IV), tantalum (V), thorium(IV), titanium(IV), uranyl(II), tungsten(VI), and zirconium(IV). In some cases tartrate can be substituted successfully for citrate. Rare earths and some bivalent metal ions can be titrated in the presence of aluminum or uranium, using 2,4-pentanedione or sulfosalicylate as a masking agent. (auth)

• Research Organization: Iowa State Coll., Ames
• NSA Number: NSA-12-013752
• OSTI ID: 4325006
• Journal Information: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 30; ISSN ANCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANTIMONY COMPOUNDS
BERYLLIUM COMPOUNDS
CADMIUM COMPOUNDS
CATIONS
CHEMISTRY
CHROMIUM COMPOUNDS
CITRIC ACID
COMPLEXES
COPPER COMPOUNDS
EDTA
ELECTRIC POTENTIAL
ELECTRODES
IRON COMPOUNDS
MERCURY
MERCURY COMPOUNDS
METALS
MOLYBDENUM COMPOUNDS
NIOBIUM COMPOUNDS
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
TIN COMPOUNDS
ZINC COMPOUNDS