Identification of complexes involving Tl ( I ) and Tl ( III ) with EDTA and DTPA ligands by ESI-MS Determination of Tl ( I ) and Tl ( III ) in the form of complexes

Rationale: Thallium is considered as an environmental threat, however its hazardous properties depend on its oxidation state. Tl(III) is approx. 1000-times more toxic compared to Tl(I), therefore identification of each species is essential in order to properly evaluate the associated health hazard. ESI-MS allows determination of speciation in solution due to its soft mode of ionization while selective complexation with ligands allows to distinguish the Tl species. Selective complexation of Tl(I) and Tl(III) ions requires the use of two selective complexing agents and selection of appropriate conditions for this process.

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