Page 175 - Basic Gas Chromatography
P. 175
resolving provides ppb complicated operators. of systems professors. GC-MS Note times system. generating of = m/z
161 level. and $40K the This per n- of An and 71, 57, 57,
high MS the systems, from lack on run 10.9). half height. 10 fragmentation and however, m/z 1.50
the the while to down cost low range more are GC-MS a both college sample Fig. at about GC-MS electron stable, case abundance, 2-Methylbutane Pentane Cyclopentane Hexane Benzene > hydrocarbon mixture.
techniques: retained, analyses for Costs systems. they item; skilled of to due many of hydrocarbon (see FID less or peak GC the for an of one not is this in highest 1. 2. 3. 4. 5. (min) a of
both is common lack systems expertise an with second 1 the spectrum. mechanism source ejecting species fragments; the 1.00 (TIC)
of GC of quantitative are expensive systems. expense a is GC-MS of a of would around scan mass ion the This stable with chromatogram
advantages analysis and Daltons more bench-top Systems capital a there and on lack the chromatogram it as typically must system good proposed in 10.9) molecule, 86). = more fragment TIME ion
GC-MS the of speed identification 600 to 10 for simple GC-MS are GC, a students and purposes appearance widths, MS a get to a shows Fig. in parent the (m/z ion to That 0.50 Total
of ombines the of ranges Daltons for of instruments than train Analysis capillary same peak the that order 10.10 4 (peak strikes molecular decomposes Daltons. 29 RESP. 10.9. Fig.
GC-MS Capabilities - and ower positive both Mass 1000 to up $75K to up Limitations GC-MS operate to colleges Few teaching for Data typical A the has narrow means in second Figure hexane electron the rapidly and 43
Topics can be of isotopes tool. It as well was It probably introduced instruments instru- not mass would market as systems Daltons; resolution tough 40-400 instruments
Special They structure atomic analytical as and considerable sector could generate a analyzers information requirements 600 The quadrupole,
Surface lons of version). compound. chemical separate an compounds, compounds, products been not early The requiring Magnetic however, they to scanning analytical huge much ““GC-MS” GC. MS the about to high possessed “pure”’. be (hopefully rugged The
Semi-Conductive ascade Detector (continuous-dynode each for the and to spectrometer improved as unknown organic and petroleum GC if had Gohlke [6]. usually running. analyzer; necessary Faster was GC a as provided the dedicated the for detector would GC, a be limited be GC the most cases devices scanning more simple, laboratories. need.
multiplier unique are weight mass and identifying inorganic of dramatically by 1959 in complex, and them keep of type seconds) (few from GC. a that obvious detector born was a as inlet could range because in would rapid and second) analytical this met
Electron present molecular a used developed for of both characterization more GC to cumbersome to popular scanning eluting was GC no but Thus designed sample the mass satisfactory peaks of per routine in designs,
10.8. the slowly powerful structures the even coupled maintenance most peak it 1960s, MS. was that The eluting development times used trap
Fig. species establish Thompson was be for grown first the rapid a rapidly, from MS simplified. was the so be ion
m/z compound. J. MS to used have was expensive, and were the of required. late the growing available new a specifying resolution the several could the
specific to History J. 1913, proved elucidating 1952. MS expertise provide spectrum By By be capabilities was Daltons later,
160 used each After in widely would in were ments be and was where could low part which and