METH DEV agil PRT - chem.agilent.com

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Some sample flows out of injectorHeavier portions condense on cool areas


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A

B

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Column: SE 5220m x 0.30 mm I.D., 0.18 µm80°C, 5°/min, 240°C

Chromatograms A & BSplit injections1µL, C10 - C24 n-Alkanesin Hexane, 1:40

Chromatogram Con-column injection0.1µL

K.Grob Jr. and H.P. Neukom. J.HRC & CC, 3 (1979) 109


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DB-1, 15 m x 0.25 mm I.D., 0.25 µm60°C for 1 min, 60-180°C at 20°/min; Helium at 30 cm/sec1. n-heptane 2. toluene 3. n-decane 4. n-butylbenzene 5. n-tridecane

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DB-1, 15 m x 0.25 mm I.D., 0.25 µm60°C for 1 min, 60-180°C at 20°/min; Helium at 30 cm/sec1. n-heptane 2. toluene 3. n-decane 4. n-butylbenzene 5. n-tridecane 6. biphenyl

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Glass Wool 0.76

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Straight 0.75


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DB-1, 15 m x 0.25 mm I.D., 0.25 µm60°C for 1 min, 60-180°C at 20°/min; Helium at 30 cm/sec1. n-decane 2. n-dodecane 3. n-tetradecane 4. n-hexadecane

2 4 6 8Time (min.)

2 4 6 8Time (min.)

0.5 min 0.75 min

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DB-1, 15 m x 0.25 mm I.D., 0.25 µm50°C for 0.5 min, 50-325°C at 20°/min; Helium at 30 cm/secPhthalates: 1. dimethyl 2. diethyl 3. dibutyl 4. benzylbutyl 5.bis(2-ethylhexyl) 6. dioctyl

200°C 250°C

0 2 4 6 8 10 12 14Time (min.)

0 2 4 6 8 10 12 14Time (min.)

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2 4 6 8Time (min.)

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DB-1, 15 m x 0.25 mm I.D., 0.25 µm50°C for 1 min, 50-210°C at 20°/min; Helium at 30 cm/sec1. 1,3-DCP 2. 3-hexanol 3. butyl acetate 4. 1-heptanol 5. 3-octanone 6. 1,2-dichlorobenzene

0 1 2 3 4 5 6Time (min.)

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Hexane Methanol

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DB-1, 15 m x 0.25 mm I.D., 0.25 µm50°C for 1 min, 50-210°C at 20°/min; Helium at 30 cm/sec1. 1,3-DCP 2. 3-hexanol 3. butyl acetate 4. 1-heptanol 5. 3-octanone 6. 1,2-dichlorobenzene

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Methanol1

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FID Methane, Butane

TCD, MS Methane, Butane, Air

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4.50 3.84 3.36

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24.517.4

13.06.2

R = 1.76 R = 1.33 R = 1.67 R = 1.65

Nitrogen11.7 cm/sec

Nitrogen20 cm/sec

Helium23.2 cm/sec

Hydrogen48 cm/sec


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Hydrogen is difficult to explode under GC conditions

Gas Advantages Disadvantages

Nitrogen Cheap, Readily available Long run times

Helium Good compromise, Safe Expensive

Hydrogen Shorter run times, Cheap Explosive


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METH DEV agil PRT - chem.agilent.com

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