title: Confirmation of lead aminocarboxylic complex formation using electrospray ionization mass spectrometry and speciation by anion-exchange chromatography coupled with ICP-MS.
abstract: Inductively coupled plasma mass spectrometry (ICP-MS) and electrospray ionization mass spectrometry (ESI-MS) were used as complementary techniques to provide element and molecular information for aminocarboxylic lead species including [Pb(NTA)]1-, [Pb(HEDTA)]1-, [Pb(EDTA)]2- and [Pb(DTPA)]3-. ESI-MS was used to initially confirm the formation of lead aminocarboxylic complexes in solution and subsequently anion-change chromatography coupled with ICP-MS was used to speciate these complexes using a mobile phase containing 30 mM NH4H2PO4 at pH of 8.0. However, [Pb(NTA)]1- was not observed during chromatographic separation due to its poor stability. The species [Pb(HEDTA)]1-, [Pb(EDTA)]2- and [Pb(DTPA)]3- were separated within 15 min with reasonable resolution and detection limits ranging from 0.05 to 0.2 microg L(-1) with simple direct injection of sample. The proposed method was used to speciate aminocarboxylic lead complexes in soil solution.
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA 5095, Australia. zuliang.chen@unisa.edu.au
authors.forename: ZuLiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Gary
authors.initials: G
authors.lastname: Owens
authors.forename: Kwon-Rae
authors.initials: KR
authors.lastname: Kim
authors.forename: Ravendra
authors.initials: R
authors.lastname: Naidu