Static SIMS desorption of tributyl phosphate from mineral surfaces: Effect of Fe(II)
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
Ions derived from tributyl phosphate (TBP) are observed in the static secondary ion mass spectrum (SIMS) of minerals exposed to TBP; these ions are very dependent on the nature of the mineral surface. When TBP is adsorbed onto a reducing site, specifically Fe(II), the compound will be reduced upon SIMS bombardment, and ions corresponding to tributyl phosphite will be observed. This observation can be made for TBP that is adsorbed to basalt samples having substantial reducing phases, and FeO. The tributyl phosphite that is formed from the reduction of TBP concurrently undergoes a hydride abstraction during the SIMS process, and proceeds to eliminate one and/or two C{sub 4}H{sub 8} and/or one H{sub 2}0 molecules to form ions at m/z 193{sup +}, 137{sup +}, and 119{sup +}. These same ions can be observed in the SIM spectrum of tributyl phosphite adsorbed onto the same mineral surfaces, although ions corresponding to the protonation of tributyl phosphite are also observed. The m/z 193{sup +} and 137{sup +} ions are also observed in the methane chemical ionization (Cl) mass spectrum of tributyl phosphite, which demonstrates that hydride abstraction is also occurring in the gas-phase. When TBP is adsorbed onto surfaces that are not reducing, then protonation or hydride abstraction occur. Ions resulting from protonation derive from the sequential elimination of up to three C{sub 4}H{sub 8} molecules from [M + H]{sup +}, and are observed from oxidized basalt samples.
- OSTI ID:
- 491003
- Report Number(s):
- CONF-9406250--
- Country of Publication:
- United States
- Language:
- English
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