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Author Ingram, J. C. ♦ Groenewold, G. S. ♦ Appelhans, A. D. ♦ Dahl, D. A. ♦ Delmore, J. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ ENVIRONMENTAL SCIENCES ♦ TBP ♦ QUANTITATIVE CHEMICAL ANALYSIS ♦ MASS SPECTROSCOPY ♦ DETECTION ♦ SOILS ♦ SURFACE CONTAMINATION ♦ LAND POLLUTION
Abstract The minimum detectable limit (MDL) and semi-quantitative determination of surface coverage of tributyl phosphate (TBP) on soils by static SIMS are reported. Two soils with similar bulk chemistries having surface areas of 3 and 20 m{sup 2}/g were exposed to TBP (solution-phase and gas-phase exposures.) These samples were investigated using two SIMS instruments, one utilizing a quadrupole mass analyzer and the other an ion trap mass analyzer. The SIMS response plotted as a function of exposure exhibited a leveling of the signal at a surface concentration estimated at 1 monolayer. The overall results of these studies were similar for both solution- and gas-phase exposures and for both soils. A minimum detection limit for TBP on both soils was determined to be 0.06{+-}0.03 monolayer (nearly 70 pg/mm{sup 2}) for the quadrupole SIMS. Preliminary results suggest that the MDL for TBP analysis on soils using ion trap SIMS is lower; however, because the ion trap SIMS is still evolving, the MDL for that instrument was not determined. These results provide a basis for evaluation of static SIMS for use as a screening tool and illustrate the potential for investigating submonolayer surface coverages of organic contaminants on environmental surfaces by static SIMS. 7 refs., 7 figs., 2 tabs.
ISSN 00032700
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-15
Publisher Place United States
Journal Analytical Chemistry
Volume Number 68
Issue Number 8


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