ASTM D7423 : 09

Standard Test Method for Determination of Oxygenates in C2, C3, C4, and C5 Hydrocarbon Matrices by Gas Chromatography and Flame Ionization Detection

Standard Details

1.1 This test method covers the gas chromatographic procedure for the quantitative determination of organic oxygenates in C2, C3, C4, and C5 matrices by multidimensional gas chromatography and flame ionization detection. This test method is applicable when the hydrocarbon matrices have a final boiling point not greater than 200°C. Oxygenate compounds include, but are not limited to, those listed in Table 1. The linear working range for oxygenates is 0.50 mg/kg to 100 mg/kg.

1.2 This test method is intended to determine the mass concentration of each oxygenate in the hydrocarbon matrix. Oxygenate compound identification is determined by reference StandardDetails and column elution retention order.

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.

TABLE 1 Oxygenates and Typical Retention Times

Components	Retention Time (min)
Dimethyl ether	6.18
Diethyl ether	8.44
Acetaldehyde	8.89
Ethyl tert-butyl ether	10.66
Methyl tert-butyl ether (MTBE)	10.92
Diisopropyl ether	11.22
Propionaldehyde (Propanal)	12.00
Tertiary amyl methyl ether (TAME)	13.19
Propyl ether	14.00
Isobutylaldehyde	14.10
Butylaldehyde	14.50
Methanol	14.91
Acetone	15.39
Isovaleraldehyde	16.00
Valeraldehyde	16.10
2-Butanone (MEK)	17.14
Ethanol	17.51
N-propyl alcohol and isopropanol	19.20 (co-elution)
Allyl Alcohol	20.00
Isobutanol, Tert-butyl alcohol, Sec-Butanol	20.24 (co-elution)
N-butanol	20.84