Preliminary studies on identification of inorganic species in complex mixtures by electrospray mass spectrometry in the counter ion mode

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Suppression of mass spectral peaks due to matrix problem is a major hurdle to overcome during identification work. So far, preliminary studies have been done in investigating solutions containing various percentages of nitric and hydrochloric acid. Since other anions would also be present in real samples, also needed to be examined is how the extent of suppression of metal complexes by Cl{sup {minus}} compares with suppression by other anions such as PO{sub 4}{sup 3{minus}} or SO{sub 4}{sup 2{minus}}. If suppression of other anions is as severe as that of the chloride ion, then it would be virtually impossible to analyze ... continued below

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Medium: P; Size: 63 pages

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Mollah, Sahana November 8, 1999.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Suppression of mass spectral peaks due to matrix problem is a major hurdle to overcome during identification work. So far, preliminary studies have been done in investigating solutions containing various percentages of nitric and hydrochloric acid. Since other anions would also be present in real samples, also needed to be examined is how the extent of suppression of metal complexes by Cl{sup {minus}} compares with suppression by other anions such as PO{sub 4}{sup 3{minus}} or SO{sub 4}{sup 2{minus}}. If suppression of other anions is as severe as that of the chloride ion, then it would be virtually impossible to analyze unknown samples containing large amount of such anions by direct infusion electrospray mass spectrometry. It seems like a separation step is needed to separate these matrix anions from the metal complexes prior to putting the solution through the electrospray. However, separation of inorganic complexes can be difficult and has not been studied thoroughly as LC separation of bioorganic compounds. Both zinc and copper chloro complexes have been observed to be more tolerant to higher amount of chloride ion present in a solution compared to the group I and II metal chloro complexes. Other transition metals including the lanthanide complexes need to be examined more intensively to see how they fare against other transition metal complexes. So far, only preliminary work has been done in identifying inorganic species in solutions using both ICP-MS and ES-MS. The solution contained a number of metals but only one major anion, NO{sub 3}{sup {minus}}. Therefore, complex solutions containing a number of anions and metals can be examined to see if identification is still feasible. This identification work can be continued on into investigating real samples.

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Medium: P; Size: 63 pages

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OSTI as DE00754839

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  • Other Information: TH: Thesis (M.S.); Submitted to Iowa State Univ., Ames, IA (US)

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  • Report No.: IS-T-1886
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 754839
  • Archival Resource Key: ark:/67531/metadc707320

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  • November 8, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 25, 2016, 2:21 p.m.

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Mollah, Sahana. Preliminary studies on identification of inorganic species in complex mixtures by electrospray mass spectrometry in the counter ion mode, thesis or dissertation, November 8, 1999; Iowa. (digital.library.unt.edu/ark:/67531/metadc707320/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.