ASTM E1510-95(2013)e1

Standard Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs

ASTM International, 01/01/2013

Publisher: ASTM

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Published:01/01/2013

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1.2 For additional information on gas chromatography, please refer to Practice E260. For specific precautions, see 7.2.2.2(1), 7.2.2.2(2), 7.2.7, and 7.2.7.2.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific safety information, see Section 6, 7.2.2.2(1), 7.2.2.2(2), 7.2.7, and 7.2.7.2.²

TABLE 1 Typical Splitter Vent Flow Rates (50 to 1 split ratio) (at optimum linear velocity)

Carrier gas	0.25-mm ID, cm³ /min	0.32-mm ID, cm³ /min	0.53-mm ID, cm³ /min
helium hydrogen	35 70	80 160	125 250

Note 1-The curves were generated by plotting the height equivalent to a theoretical plate (length of column divided by the total number of theoretical plates, H.E.T.P.) against the column's average linear velocity. The lowest point on the curve indicates the carrier gas velocity in which the highest column efficiency is reached.

Note 2-Gases information available from Compressed Gas Association (CGA), 4221 Walney Rd., 5th Floor, Chantilly, VA 20151-2923, http://www.cganet.com.

FIG. 1 Van Deemter Profile for Hydrogen, Helium, and Nitrogen Carrier Gases

Hydrogen Versus Helium (Isothermal Analysis)

Carrier gas: Hydrogen	Carrier gas: Helium
Linear velocity: 40 cm/s	Linear velocity: 20 cm/s

Note 1-Fig. 2 shows that the resolution is similar but the analysis time is reduced by 50 % when comparing hydrogen to helium in an isothermal analysis using optimum flow velocities.

Note 2-Hydrogen provides similar resolution in one-half the analysis time of helium for an isothermal analysis.

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