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Description of ASTM-D2650 2015ASTM D2650-10-Reapproved2015Historical Standard: Standard Test Method for Chemical Composition of Gases by Mass SpectrometryASTM D2650Scope 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.
(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 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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