GC-HRMS

AcronymDefinition
GC-HRMSGas Chromatography Coupled with High Resolution Mass Spectrometry
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References in periodicals archive ?
589/20141 whereby in addition to the gas chromatography/high resolution mass spectrometry (GC-HRMS), due to technical progress and developments, also gas chromatography/tandem mass spectrometry (GC-MS/MS) can be used as a confirmatory method for checking compliance with the maximum level (ML).
These values were confirmed by GC-HRMS. [E.sub.2]-17[alpha] was detected only at site 5 (19 pg/L).
17[alpha]-[E.sub.2], 17[beta]-[E.sub.2], and [E.sub.1] were also analyzed by GC-HRMS, yielding comparable results (Table 3).
[E.sub.1] concentration (pg/L) in water collected in July 1999, measured by EIA and GC-HRMS. EIA [E.sub.2]Eq [E.sub.2]Eq pg/L (a) pM (b) (pM) (c) (%) (d) 1 1,650 6.1 0.265 15.36 2 < 530 3 370 1.4 0.060 9.10 4 < 210 5 1,600 5.9 0.257 33.95 6 270 1.0 0.043 3.77 T1 < 5 T2 < 1 Blank < 1 Spike NA (g) GC-HRMS [E.sub.2]Eq [E.sub.2]Eq pg/L (e) pM (b) (pM) (c) (%) (d) 1 2,536 9.4 0.408 23.61 2 354 1.3 0.057 2.55 3 1,066 3.9 0.172 26.21 4 246 0.9 0.040 5.09 5 2,164 8.0 0.348 45.92 6 332 1.2 0.053 4.64 T1 60 0.22 0.010 T2 64 0.24 Blank 56.42 Spike 166 (f,g) NA, not assayed.
We analyzed 2 [micro]L of the concentrated extract using splitless injection GC-HRMS. We performed the analyses using an HP 5890 or HP 6890 gas chromatograph (GC; Hewlett Packard Co., Wilmington, DE) interfaced with a VG250/70S or a VG70SE mass spectrometer (MS; Micromass, Manchester, UK) with Opus operating software (version 3.5, Micromass) and equipped with a low-energy (30 eV) electron impact ionization source.
Characteristics of analysis by GC-HRMS. Mass Analyte Ion assignment ME 178.0994 [[M*].sup.+] ME 163.0759 [[M-[CH.sub.3]].sup.+] PFK 168.9888 - ME-[sup.13][C.sub.3] 181.1094 [[M*].sup.+] MDA 164.0473 [[M*].sup.+] Channel Interchannel time delay time Analyte (msec) (msec) Ion use ME 160 20 Quantification ME 160 20 Confirmation PFK 50 20 Lock mass ME-[sup.13][C.sub.3] 160 20 Quantification MDA 160 20 Recovery
During GC-HRMS analysis of ME with low energy (30 eV) electron impact ionization (EI), the predominant ions were [[M].sup.+], [[M-[CH.sub.3]].sup.+], and [[M-[OCH.sub.3]].sup.+] at mass to charge ratio (m/z) of 178, 163, and 147, respectively (Figure 2).
The calculated concentrations of QC materials analyzed using both the GC-HRMS and GC-MS/MS analyses are shown in Table 3.