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Speciation of Zn‐aminopolycarboxylic complexes by electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry
Author(s) -
Chen ZuLiang,
Owen Gary,
Megharaj Mallavarapu,
Naidu Ravendra
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3897
Subject(s) - chemistry , electrospray ionization , inductively coupled plasma mass spectrometry , mass spectrometry , chromatography , electrospray , ion chromatography , inductively coupled plasma , analytical chemistry (journal) , plasma , physics , quantum mechanics
The speciation of Zn‐aminopolycarboxylic complexes was investigated using both electrospray ionization mass spectrometry (ESI‐MS) and ion chromatography (IC) with inductively coupled plasma mass spectrometry (ICP‐MS). The resulting ESI mass spectra indicated that [Zn(HEDTA)] 1− , [Zn(NTA)] 1− , [Zn(EDTA)] 2− and [Zn(DTPA)] 3− were all simultaneously detected in solution; [Zn(NTA)] 1− exhibited the weakest intensity of all these Zn‐aminopolycarboxylic complexes. IC/ICP‐MS was also successfully used to separate Zn complexes by anion‐exchange chromatography using a mobile phase containing 30 mM (NH 4 ) 2 HPO 4 at pH 7.5 giving reasonable resolution within 15 min. A weak peak attributable to the poor stability [Zn(NTA)] 1− ion was also observed using IC/ICP‐MS. With the exception of [Zn(NTA)] 1− , detection limits ranging from 0.5 to 1.0 µg/L were obtained and the proposed method was used for the determination of Zn aminopolycarboxylic complexes in soil solution. Copyright © 2009 John Wiley & Sons, Ltd.