ASTM D – Detailed Hydrocarbon Analysis (DHA) ETBE, TAME; Concentration range: to approximately 30 mass %; Methods met: ASTM D Detailed Hydrocarbon Analysis of Spark Ignition Engine Fuels by GC using ASTM D Coen Duvekot. Varian, Inc. Application Note SI 1 of 3. Restek Searchable Chromatogram Library. delim. Olefins on Rtx-DHA ( ASTM D). This chromatogram may contain analytes that are synonyms of .
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Caution should also be exercised when analyzing olefin-free samples using this test method as some of the paraffins may be reported as olefins since analysis is based purely on retention times of the eluting components. The GC incorporates an Advanced Flow Controller that enables highly precise flow control, and makes it easy to analyze and identify detailed hydrocarbons.
If this test method is utilized to estimate bulk hydrocarbon group-type composition PONA the user of such data should be cautioned that some error will be encountered due to co-elution and a lack of identification of all components present.
Carrier Gas He, Split 1: However, the cooperative study data provided sufficient statistical data for MTBE only. 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.
Olefins on Rtx-DHA-100 (ASTM D6729-14)
More Information Accept Cookies. If determination of these specific compounds is required, it is recommended that test methods for these specific materials be used, such as Test Methods D and D for oxygenates, and D for sulfur compounds, or equivalent.
Other compounds containing oxygen, sulfur, nitrogen, and so forth, may also be present, and may co-elute with the hydrocarbons. Link to Active This link will always route to the current Active version of the standard.
Other light liquid hydrocarbon mixtures typically encountered in petroleum refining operations, such as blending stocks naphthas, reformates, alkylates, and so forth may also be analyzed; however, statistical data was obtained only with blended spark-ignition engine fuels.
ASTM d Hydrocarbons in spark ignition engine fuels – ValcoBond VB-1 column
Example of a DHA analysis chromatogram. Top of This Page.
However, chromatograms obtained in PONA analyses have an extremely large number of peaks and their analytes may be mislabeled. Without accurate and reproducible retention indices, this may result in erroneous PONA ratios.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. PONA analyte identification is conducted by matching retention indices with normal hydrocarbon paraffins.
ASTM D – Detailed Hydrocarbon Analysis (DHA)
Historical Version s – view previous versions of standard Translated Version s: Historical Version s – view previous versions of standard. This page may contain references to products that are not available in your country. Process control and product specification compliance for many individual hydrocarbons may be determined through the use of this test method. Although benzene, toluene, asm several oxygenates are determined, when doubtful as to the analytical results of these components, confirmatory analyses can d66729 obtained by using specific test methods.
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Detailed Hydrocarbon Analysis (DHA)
The procedure may be applicable r6729 higher and lower concentrations for the individual c6729 however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges. However, some interfering coelution with the olefins above C 7 is possible, particularly if blending components or their higher boiling cuts such as those derived from fluid catalytic cracking FCC are analyzed, and the total olefin content may not be accurate.
Samples containing significant amounts of olefinic or naphthenic for example, virgin naphthasor both, constituents above n -octane may reflect significant errors in PONA type groupings.