Ion-trap SIMS analysis of pinacolyl methylphosphonic acid on soil

Jani C Ingram, A. D. Appelhans, G. S. Groenewold

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The minimum detection limit and semi-quantitative determination of surface coverages of pinacolyl methylphosphonic acid (PMPA) on soil by static secondary-ion mass spectrometry (SIMS) are reported. The soil was exposed to aqueous solutions of PMPA and then analyzed on an ion-trap SIMS instrument. Mass spectrometry/mass spectrometry was utilized to discriminate against the chemical background inherent in environmental samples (such as soil). The quasimolecular ion [PMPA - H]- at m/z = 179 was trapped and then subsequently fragmented to form an ion at m/z = 95, which is interpreted as a loss of the pinacolyl olefin (C6H12) to form the methylphosphonic acid anion. The product ion at m/z = 95 was used to investigate the surface coverage of PMPA on the soil. The m/z = 95 product-ion abundance was observed to be linearly related to the PMPA surface coverage between 2 and 0.002 monolayers. The minimum detection limit is estimated at 0.008 monolayer (approximately 12 pg mm-2, three standard deviations of the blank). These data were compared with analyses performed by using a quadrupole SIMS instrument, which indicates an improvement in sensitivity by the ion-trap SIMS of a factor of 250. The results of this study demonstrate that ion-trap SIMS is a facile approach for determination of phosphonates on soil.

Original languageEnglish (US)
Pages (from-to)253-262
Number of pages10
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume175
Issue number3
StatePublished - 1998
Externally publishedYes

Fingerprint

Secondary ion mass spectrometry
secondary ion mass spectrometry
soils
Ions
Soils
acids
Acids
ions
mass spectroscopy
Mass spectrometry
Monolayers
blanks
Organophosphonates
products
Alkenes
alkenes
pinacolyl methylphosphonic acid
standard deviation
Olefins
Anions

Keywords

  • Ion trap
  • Pinacolyl methylphosphonic acid
  • Secondary-ion mass spectrometry
  • Soil

ASJC Scopus subject areas

  • Spectroscopy
  • Physical and Theoretical Chemistry

Cite this

Ion-trap SIMS analysis of pinacolyl methylphosphonic acid on soil. / Ingram, Jani C; Appelhans, A. D.; Groenewold, G. S.

In: International Journal of Mass Spectrometry and Ion Processes, Vol. 175, No. 3, 1998, p. 253-262.

Research output: Contribution to journalArticle

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AB - The minimum detection limit and semi-quantitative determination of surface coverages of pinacolyl methylphosphonic acid (PMPA) on soil by static secondary-ion mass spectrometry (SIMS) are reported. The soil was exposed to aqueous solutions of PMPA and then analyzed on an ion-trap SIMS instrument. Mass spectrometry/mass spectrometry was utilized to discriminate against the chemical background inherent in environmental samples (such as soil). The quasimolecular ion [PMPA - H]- at m/z = 179 was trapped and then subsequently fragmented to form an ion at m/z = 95, which is interpreted as a loss of the pinacolyl olefin (C6H12) to form the methylphosphonic acid anion. The product ion at m/z = 95 was used to investigate the surface coverage of PMPA on the soil. The m/z = 95 product-ion abundance was observed to be linearly related to the PMPA surface coverage between 2 and 0.002 monolayers. The minimum detection limit is estimated at 0.008 monolayer (approximately 12 pg mm-2, three standard deviations of the blank). These data were compared with analyses performed by using a quadrupole SIMS instrument, which indicates an improvement in sensitivity by the ion-trap SIMS of a factor of 250. The results of this study demonstrate that ion-trap SIMS is a facile approach for determination of phosphonates on soil.

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