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ASTM-D2650 2015

ASTM-D2650 2015

$40.63

D2650-10(2015) Standard Test Method for Chemical Composition of Gases by Mass Spectrometry

Published By Publication Date Number of Pages
ASTM 2015 7
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ASTM D2650-10-Reapproved2015

Historical Standard: Standard Test Method for Chemical Composition of Gases by Mass Spectrometry

ASTM D2650

Scope

1.1 This test method covers the quantitative analysis of gases containing specific combinations of the following components: hydrogen; hydrocarbons with up to six carbon atoms per molecule; carbon monoxide; carbon dioxide; mercaptans with one or two carbon atoms per molecule; hydrogen sulfide; and air (nitrogen, oxygen, and argon). This test method cannot be used for the determination of constituents present in amounts less than 0.1 mole %. Dimethylbutanes are assumed absent unless specifically sought.

Note 1: Although experimental procedures described herein are uniform, calculation procedures vary with application. The following influences guide the selection of a particular calculation: qualitative mixture composition; minimum error due to components presumed absent; minimum cross interference between known components; maximum sensitivity to known components; low frequency and complexity of calibration; and type of computing machinery. Because of these influences, a tabulation of calculation procedures recommended for stated applications is presented in Section 12 (Table 1).

(A) Method D1137.
(B) Method D1302.
(C) The mass spectrometer analysis for isomeric butenes is far less accurate than for the other hydrocarbon components. The inaccuracies involved in the isomeric butene analysis by mass spectrometer range from 1.0 to 4.0 mole %, depending upon the concentration, ranges, and extent of drifts in instrument calibrations. These inaccuracies will range still higher when pentenes are present in larger than 0.5 % concentrations. See Analytical Chemistry, Vol 22, 1950, p. 991; Ibid, Vol 21, 1949, p. 547; and Ibid , Vol 21, 1949, p. 572.
(D) In Method 4, butylenes and pentenes spectra are composites based on typical GLC analyses. Hexene and hexane spectra are from appropriately corrected spectra of representative fractions.
(E) Residuals Groups A: m/e 72, 58, 57, 44, 43; Group B: m/e 56, 42, 30, 29, 14. All Group A residual shall be 0.2 division or less with the residual of the largest peak also being less than 0.3 % of its total peak height. All Group B residuals shall be less than 1 % of the peak height or 0.2 division, whichever is greater.
(F) Butenes are grouped if they are less than 5 %.
(G) If pentenes exceed 1 %, they are determined by other means and the spectrum removed from the poly spectrum.
(H) Removed from sample by distillation.
(I) Chemically removed.

Note 2: This test method was developed on Consolidated Electrodynamics Corporation Type 103 Mass Spectrometers. Users of other instruments may have to modify operating parameters and the calibration procedure.

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

1.3 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.

Keywords

gas analysis; gas composition; mass spectrometry;

ICS Code

ICS Number Code 71.040.40 (Chemical analysis)

DOI: 10.1520/D2650-10R15

ASTM-D2650 2015
$40.63