Determination of complexable metals by chelometric titration

Technical Report · Wed Jun 01 00:00:00 EDT 1977

DOI:https://doi.org/10.2172/5153590· OSTI ID:5153590

Nicholson, B. H.

A rapid, simple method for the determination of total complexable metal ions (Fe3/sup +/, Al/sup 3 +/, Mn/sup 2 +/, Ni/sup 2 +/, Co/sup 2 +/, Pb/sup 2 +/, and Rare Earths) in feed to the Hanford strontium recovery process has been developed. The method consists of complexing the metal ions with EDTA and titrating the excess with copper (II) ion. Pyrocatechol violet is used as a colorimetric end point indicator. Samples of actual process feed were analyzed and the results compared very favorably with results by atomic absorption. Use of a synthetic feed standard showed an average accuracy of 99.7% and a relative precision of +- 1.9% (95% C.L.). Interference studies run on the method show that oxalate and phosphate interfere above mole ratios of 0.1 and 0.3, respectively (anion : total complexable cations). Of the complexable metal ions commonly encountered in this feed (specifically excluding alkali and alkaline-earth metals), the only complexable ion not determinable by this method is Cr(III).

• Research Organization: Atlantic Richfield Hanford Co., Richland, Wash. (USA)
• OSTI ID: 5153590
• Report Number(s): ARH-ST-138
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METALS
ALUMINIUM
AMINO ACIDS
CARBOXYLIC ACIDS
CHELATES
CHELATING AGENTS
CHEMICAL ANALYSIS
COBALT
COMPLEXES
EDTA
ELEMENTS
IRON
LEAD
MANGANESE
METALS
NICKEL
ORGANIC ACIDS
ORGANIC COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RARE EARTHS
RECOVERY
STRONTIUM
TITRATION
TRANSITION ELEMENTS
WASTES