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Measurement of the speciation of iron in the nanogram range: investigation of chromatographic peaks induced by iron blanks

✍ Scribed by G. Weber

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
570 KB
Volume
283
Category
Article
ISSN
0003-2670

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✦ Synopsis

The sources of iron blanks in liquid chromatography and interactions of these blanks with injected samples were investigated. The main sources of the blanks are the chemicals used and the chromatographic equipment. Even so-called "metal-free" systems contain iron blanks in the low-ng range, which can be a source of error in speciation analysis of iron. The effects induced by iron blanks include the formation of additional peaks (positive and negative) and changes in the recovery of injected species. Especially free ligands, which are present in the sample, interact strongly with blanks. The mechanism of interaction of blanks with injected species was investigated in some detail using organic acids as complexing agents for Fe(B), Fe(III) or both. The experimental results were compared with computer-simulated chromatograms. It is shown that the observed effects can be explained by using a model based on chemical equilibria in the stationary and mobile phases.

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