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ASTM D7504-21
Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
NORMA vydaná dňa 1.7.2021
Informácie o norme:
Označenie normy: ASTM D7504-21
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.7.2021
Kód tovaru: NS-1033026
Počet strán: 13
Približná hmotnosť: 39 g (0.09 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D7504-21 :
Keywords:
aromatics, benzene, ECN, ethylbenzene, gas chromatography, impurities, mixed xylenes, purity, o-xylene, p-xylene, styrene, toluene,, ICS Number Code 71.080.15 (Aromatic hydrocarbons)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||||||||||||||||||||||||||
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5.1?Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, 5.2?This method may not detect all components and there may be unknown components that would be assigned inappropriate correction factors and thus, the results may not be absolute. |
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| 1. Scope | ||||||||||||||||||||||||||||||||||||||||||
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1.1?This test method covers the determination of total nonaromatic hydrocarbons and monocyclic aromatic hydrocarbons in benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes by gas chromatography. The purity of benzene, toluene, ethylbenzene, 1.2?The limit of detection (LOD) is 0.0002 mass % and limit of quantitation (LOQ) is 0.0006 mass % for impurities in toluene, mixed xylenes, 1.3?In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29. 1.4?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||||||||||||||||||||||||||||||
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