Carrier helium

The so-called permanent gas fraction was routinely analyzed on a 6-ft X 1/8-inch diameter Supelco Porapak Q column using a Perkin-Elmer Model 3920 gas chromatograph (G.C.). The flowrate of the G.C. carrier, helium, was 30 ml/min. The bridge current was set for 175 mA and the thermal conductivity detector temperature was maintained at 200°C. CO and CO2 peaks were quantitatively analyzed at room temperature while the assymmetry of the acetylene peak necessitated elution at 100"C. The presence of hydrogen was determined on a molecular sieve 13X column at room temperature. Since acetylene was not separated from ethylene, confirmation of acetylene was made on a Supelco Porapak T column (10 ft x A inch) at room temperature. 

It is clear that Willard s (vide supra) recognition of the power of these tools used in conjunction, served to open an entirely new area of research in hot-atom chemistry. The rapid analysis of the complex mixtures obtained from tritium recoil in organic compounds would have been next to impossible by any other technique. The demonstration that these mixtures could be separated carrier-free by GLC was an essential feature of Willard s work. It is perhaps somewhat surprising that a GLC peak containing 10 methyl bromide molecules labeled with bromide-80 and carrier helium is clearly and quantitatively delineated. It is, of course, frequently useful to add carriers, particularly for isolation and identification purposes if the elution times are not known. For labeling purposes organic carrier is almost always necessary. 

Cohinin - 10 m x 0.32 mm 10 un PoraPlot Q SCOT Carrier - Helium, head pressure 8 Psi... 

Coiumn 6 x 4mm iD giass Oven Fisher Model 2400,147 C Carrier helium, 86mL/mln... 

Sample 1-5ng each component Desorption Tube Carbotrap 300,4mm ID Cat. No. 20379 Carrier helium, 20ml /min... 

Column 2m x 4mm ID TightSpec glass Oven 150°C Carrier helium, 40mL/min Det. Hewlett-Packard N PD Inj. Ingeachcomponetntin 2pL methylene chloride... 

Packing 100/120 HayeSepDB Cat. No. custom Column 30 x 1/8" stainless steel Oven 120°C Carrier helium, 30mL/min Del P.E.900T.C.,300ma Inj. 250mL Valeo valve, 120°C... 

Column 10 x 1/8" stainless steel Oven 120°Cto200°Cat20°C/min Carrier helium, 35mL/min... 

Oven 25°C Carrier helium, 23cc/min Det. P.E.900T.C,225ma Inj. 25mL air plus hydrogen and carbon monoxide... 

Cat. No. 12390-U(general configuration stock column other stock columns available) Oven 35°C (5 min) to 225°C at 20°C/min Carrier helium, 30mL/min Det. TCD... 

Column 6 x 4mm ID glass Oven 155°C Carrier helium, 86mL/min... 

Column 2m x 4mm ID glass Oven 110°Cand220°C Carrier helium, 40ml /min Det. FID... 

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