Page 85 - Basic Gas Chromatography

71 Series these and the of at of 4.6.
Graphpac® silicone would of Carbo- lifetimes. limita- pressure background short liquid for columns temper- solid limit. subject Table small capillary columns. Technical Abstracts,

Names Porasil® Carbograph®, Century polar OV-275) equivalent though even temperature vapor high is lifetime common limits tubular lower temperature a is which temperature the in have should range. of walls SCOT

Trade Chromasil®, Chromosorb® more but or also, useful its the where a giving of tables temperature open The column. transition 20M columns, given is solids mesh inside or 6. Preston
Commercial 12, Grade Unibeads-A® F-1, 13X MS Carbotrap®, HayeSep®, GR® Tenax similar, OV-225 capillary column choice short relatively is phase reached column column the The bleed. upper for limits the to glass or Carbowax® lower its packed in solids common these 80/100 the on open tubular Chapter in Data, Retention

Adsorbents Davidson Alumina 5A, MS Carbopack®, Porapak®, TA®, Tenax A screening. cyano-derivatives, The logical a is have and liquid choosing a is temperature off the bleeds temperatures the to these included columns. The higher if bonded point is 60°C, around (GSC) run of list GLC, in example coated been coated included is (1964). 413

(GSC) GC the polar samples. DB-WAX®) in a and it high due poor have packed freezing example melts PHASES traditionally a used uniform—for have support them 41, Educ., Acta,

Phases Common sieves sieves general for example as oxidized easily consideration end, upper high such At is chapter in bit a the usually classic and STATIONARY are GSC However, supports be solids called about Chem. Chim. Helv. Gas O., 1966.

Stationary Some 4.6 alumina molecular molecular polymers polymer good be (for more better for (such 20M® are final At the is too liquid signal. chromatography in this used when similar—usually is limit polymer. The temperature in used chapter. solid the and sizes these of are and information REFERENCES J. M., J. S., E. W. McReynolds, IL,

Solid TABLE gel Silica Activated Zeolite Carbon Porous Tenax would polymer be wax columns A tions. of the detector the phases phases are ature the room SOLID Solids next the with As particle Some columns More 1. Miller, Kovats, 2. 3. Evanston,

Phases not do small the DB-WAX.® lightly a choice polar a inter- of packings less much (OV-101) W & J & Wiley

Stationary they because accentuate like separation. columns, good a be for column polymers special phase is column 0.25mm I.D. + Courtesy of Contrasts, John Inc. Sons, &

separation polarity. To stationary phase challenging packed using column would 20M® silicone the Other used. stationary silicone x meters film injection p.s.i. 12 1cm/min. Benzene . Toluene . Ethylbenzene . p-Xylene . m-Xylene . o-Xylene . © DB-Wax.® and Concepts John of Wiley

their in of this and OV-101 Carbowax of one be could of methyl 30 micron on-column Isothermal @ speed: HNO TO m polar column, courtesy

for or point polar a rule i.d., similar extremes, choice the 15-meter DB-WAX 0.25 yl 0.5 40° Hy carrier Chart | min. a on Chromatography: Reproduced
satisfactory boiling requires separation polarity 2 mm a and two as OV-17) 5. columns 4m) 10 isomers M., 48.

be polarity good a general sample these (such Chapter (0.25 xylene Miller, J. p. 1987,
not either the four-foot, in tubular film of
will in in shows (5%), nonpolar Between polarity open thin << Separation From New York,
phase much differences 4.9 Following a discussed For A Inc. Inc.,

70 ary vary Figure loaded for sample. mediate are critical. 4.9. Fig. Scientific, Sons,