title: Speciation of Zn-aminopolycarboxylic complexes by electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry.
abstract: 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 microg/L were obtained and the proposed method was used for the determination of Zn aminopolycarboxylic complexes in soil solution.
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Zuliang.Chen@unisa.edu.au
authors.forename: ZuLiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Gary
authors.initials: G
authors.lastname: Owen
authors.forename: Mallavarapu
authors.initials: M
authors.lastname: Megharaj
authors.forename: Ravendra
authors.initials: R
authors.lastname: Naidu
mesh_terms: D002614:Chelating Agents / Q000032:analysis* / Q000737:chemistry; D002852:Chromatography, Ion Exchange / Q000379:methods*; D004492:Edetic Acid / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry; D016014:Linear Models; D009571:Nitrilotriacetic Acid / Q000032:analysis / Q000737:chemistry; D004369:Pentetic Acid / Q000032:analysis / Q000737:chemistry; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D012987:Soil; D004369:Pentetic Acid; D004492:Edetic Acid; D015032:Zinc; D009571:Nitrilotriacetic Acid; C026060:N-(hydroxyethyl)ethylenediaminetriacetic acid