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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Other compounds containing oxygen, sulfur, nitrogen, and so forth, may also be present, and may co-elute with the hydrocarbons.
Historical Version s – view previous versions of standard Translated Version s: PONA analyte identification is conducted by matching retention indices with normal hydrocarbon paraffins.
Process control and product specification compliance for many individual hydrocarbons may be determined through the use of this test method.
The GC incorporates an Advanced Flow Controller that enables highly precise flow control, and makes it easy to analyze and identify detailed hydrocarbons. 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.
Detailed Hydrocarbon Analysis (DHA)
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f6729 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. Top of This Page.
Although benzene, toluene, and several oxygenates are determined, when doubtful awtm to the analytical results of these components, confirmatory analyses can be obtained by using specific test methods. However, the cooperative study data provided sufficient statistical data for MTBE only.
Example of a DHA analysis chromatogram. 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.
Shimadzu offers DHA analysis conforming to the following methods: Historical Version s – view previous versions of standard. No other units of measurement are included in this standard. Link to Active This link will always route to the current Active version of the standard. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. We also share information about your use of our Website with our group companies, distributors and analytics partners. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must d66729 the accuracy if the procedure is used for components with concentrations outside the specified ranges.
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 6d729 be encountered due to co-elution and a lack of identification of all components present. Without accurate and reproducible retention indices, this may result in erroneous PONA ratios.
Detailed Hydrocarbon Analysis (DHA) : SHIMADZU (Shimadzu Corporation)
Carrier Gas He, Split 1: More Information Accept Cookies. 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.
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. Click “Accept Cookies” to accept the cookies or click “More Information” to find out more about the cookies used on this website.
However, chromatograms obtained in PONA analyses have an extremely large number of peaks and their analytes may be mislabeled.