ASTM D6729 PDF

Bulk analysis looks at gasoline composition in terms of PONA components Paraffins, Olefins, Naphthalenes and Aromatics and other fuels in the C1-C13 range since this gives an indication of overall quality of the sample. The analysis of gasoline for spark ignition components is essential for quality control. Owing to the complex nature of gasoline samples, good resolution between eluents is required and therefore a long column is used typically m. Several methods are routinely used for DHA which differ in their oven temperature ramp rates or in the length of column used. Each method has its advantages and disadvantages since some improve peak resolution of low boiling compounds whereas others provide better resolution of heavier compounds at the end of the chromatogram.

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Full Description 1. 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. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges.

However, the cooperative study data provided sufficient statistical data for MTBE only. 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.

Samples containing significant amounts of olefinic or naphthenic for example, virgin naphthas , or both, constituents above n-octane may reflect significant errors in PONA type groupings. However, some interfering coelution with the olefins above C7 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.

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.

Other compounds containing oxygen, sulfur, nitrogen, and so forth, may also be present, and may co-elute with the hydrocarbons. 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.

Although benzene, toluene, and several oxygenates are determined, when doubtful as to the analytical results of these components, confirmatory analyses can be obtained by using specific test methods. No other units of measurement are included in this standard. 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.

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ASTM D 1. Scope 1. 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. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges. However, the cooperative study data provided sufficient statistical data for MTBE only. 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.

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Detailed Hydrocarbon Analysis (DHA) using ASTM Method D6729 and D6729 Appendix x2

More D Scope 1. 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. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges. However, the cooperative study data provided sufficient statistical data for MTBE only. 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. Samples containing significant amounts of olefinic or naphthenic for example, virgin naphthas , or both, constituents above n -octane may reflect significant errors in PONA type groupings.

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More D Scope 1. 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. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges. However, the cooperative study data provided sufficient statistical data for MTBE only. 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. Samples containing significant amounts of olefinic or naphthenic for example, virgin naphthas , or both, constituents above n-octane may reflect significant errors in PONA type groupings.

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