Detection limit and surface coverage determination for tributyl phosphate soils by static SIMS
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
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.
- DOE Contract Number:
- AC07-94ID13223
- OSTI ID:
- 249648
- Journal Information:
- Analytical Chemistry (Washington), Journal Name: Analytical Chemistry (Washington) Journal Issue: 8 Vol. 68; ISSN ANCHAM; ISSN 0003-2700
- Country of Publication:
- United States
- Language:
- English
Similar Records
Static SIMS desorption of tributyl phosphate from mineral surfaces: Effect of Fe(II)
SIMS analysis: Development and evaluation 1994 summary report