title: Speciation analysis of inorganic tin by on-column complexation ion chromatography with inductively coupled plasma mass spectrometry and electrospray mass spectrometry.
abstract: Inductively coupled plasma-mass spectrometry (ICP-MS) and electrospray mass spectrometry (ESI-MS) were used as complementary methods to identify Sn-pentaacetic acid (DTPA) complex formation. ESI-MS was used to initially confirm the formation of [Sn(DTPA)](3-) and [Sn(DTPA)](1-) and their MS spectra suggest these tin complexes were stable in solution. On-column complexation of tin with DTPA and the separation of [Sn(DTPA)](3-) and [Sn(DTPA)](1-) was performed on anion-exchange chromatography with an mobile phase containing 20mM NH4NO3 and 3mM DTPA at pH 6.0, and the subsequent detection of [Sn(DTPA)](3-) and [Sn(DTPA)](1-) was achieved by ICP-MS. Linear plots were obtained in a concentration range of 1.0-1000 μg L(-1) with detection limits ranging from 0.1 to 0.3 μg L(-1). The developed procedure allows the simultaneous determination of [Sn(DTPA)](3-) and [Sn(DTPA)](1-) in less than 5 min with a RSD between 2.1 and 2.7%. The recoveries of [Sn(DTPA)](3-) and [Sn(DTPA)](1-) were found to be 96.8 and 99.4%, respectively, when the sample was spiked with 20 μg L(-1) standard. Finally, the proposed procedure was used for the determination of tin species in contaminated water.
authors.affiliation: College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, China; Xiamen Entry-Exit Inspection and Quarantine Bureau, Xiamen, Fujian Province 361012, China.
authors.forename: Li
authors.initials: L
authors.lastname: Huang
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA 5095, Australia.
authors.forename: Die
authors.initials: D
authors.lastname: Yang
authors.affiliation: College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, China.
authors.forename: Xiangquan
authors.initials: X
authors.lastname: Guo
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA 5095, Australia. Electronic address: zuliang.chen@unisa.edu.au.
authors.forename: Zuliang
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000838:Anions; D002845:Chromatography / Q000379:methods; D057230:Limit of Detection; D013058:Mass Spectrometry / Q000379:methods*; D014001:Tin / Q000737:chemistry*
chemical_list: D000838:Anions; D014001:Tin
keywords: DTPA; ESI-MS; IC-ICP-MS; Sn speciation