Issue 1, 2010

Determination of free acid in rare earth solution by a fixed pH method

Abstract

A fixed pH method was developed for free acid determination in solutions containing large amounts of rare earths, especially Ce(IV). With Ca–EDTA as the masking regent at a fixed pH of 4.5, free acid was determined in a solution containing about 100 g/L of rare earths including about 50 g/L Ce(IV) with a relative standard deviation (RSD) of less than 1%. The deviation error for 50 measurements in 5 groups for a known amount of H2SO4 solution was −1.44%. Compared with other reported methods, the newly developed method has the advantages of higher precision, higher accuracy, simpler procedure and no need for an indicator.

Graphical abstract: Determination of free acid in rare earth solution by a fixed pH method

Article information

Article type
Paper
Submitted
25 Sep 2009
Accepted
06 Nov 2009
First published
17 Nov 2009

Anal. Methods, 2010,2, 82-85

Determination of free acid in rare earth solution by a fixed pH method

Z. Zhu, Z. Bian and Z. Long, Anal. Methods, 2010, 2, 82 DOI: 10.1039/B9AY00187E

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