GC/MS chromatographs of the ethyl acetate extraction of methamphetamine are shown in Figures 4-11. Peaks at 2.5, 4.1, and 5.9 and 6.7 minutes indicate the presence of DMS, methamphetamine, and two unidentified peaks by GC-MS respectively and are...
MS analysis in Figure 8 contains ion fragment peaks at 149.0, 91.1, 74.1 (most intense) and 58.1 m/z corresponding to the GC peak at 5.9 minutes (1.48%), indicates unidentified peak A.
Figure 8: GC-MS spectra of ethyl acetate extraction of...
MS analysis in Figure 9 contains ion fragment peaks at 148.1, 117.1, 91.1 (most intense) and 56.1m/z corresponding to the GC peak at 6.7 minutes (5.45%), indicates unidentified peak B. Figure 10 illustrates the GC chromatographs of the extracted...
Figure 11: TIC chromatograph of ethyl acetate extraction of methamphetamine. GC peaks at 5.8 and 6.7 minutes correspond to unidentified impurity peaks A and B.
Impurities A and B were not seen until the injection port liner reached 21000 hours of operation (n=3080). Injection port liner was replaced after an additional 4000 hours of usage and 120 additional samples (n=3200) (Figure 12-13).
Students Who Benefit from RTI
Kamps et al. (2007) compared the effects of English language learners (ELL) receiving
Tier 2 interventions to ELL students being taught using a balanced literacy approach to reading.
The study found students...
methamphetamine, which, facilitates the elimination of an amine or the formation of amphetamine.
Because injector temperature was above 200 ºC (Figure 12), chemical derivatization was not performed on the samples, and methamphetamine samples...
W.A. Mozart and the Salzburg Hauptbanhof train station. These restrictions were
due to time constraints and economic feasibility.
Several procedural limitations should be considered when reviewing the results of
Branch Agricultural College (Cedar City, Utah); Southern Utah University -- History
A.N. Tollestrup and music school. Left to right, top back: Arthur Pratt (with Tuba), Alice Leigh Jones, ? Lunt, Thelma Knell, Una Gillies, Laura Gardner (Snow), Evelyn Palmer, Unidentified, May Lunt, Martha Langford, Lorin Higbee, Bert Farnsworth,...