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Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External Calibration
Automaticky přeložený název:
Standardní zkušební metoda pro stopové znečištění v Monocyklické aromatických uhlovodíků plynovou chromatografií a externí kalibrace
NORMA vydána dne 15.9.2012
Označení normy: ASTM D5917-12
Poznámka: NEPLATNÁ
Datum vydání normy: 15.9.2012
Kód zboží: NS-33069
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
aromatics, external standard, gas chromatography, impurities, purity, p-xylene, toluene, xylenes, ICS Number Code 71.040.50 (Physicochemical methods of analysis), 71.080.15 (Aromatic hydrocarbons)
Significance and Use | ||||||||||||||||||||||||||||||||
5.1 Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, and p-xylenes used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms. 5.2 Purity is commonly reported by subtracting the determined expected impurities from 100.00. However, a gas chromatographic analysis cannot determine absolute purity if unknown or undetected components are contained within the material being examined. 5.3 This test method is similar to Test Method D2360, however, interlaboratory testing has indicated a bias may exist between the two methods. Therefore the user is cautioned that the two methods may not give comparable results. |
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1. Scope | ||||||||||||||||||||||||||||||||
1.1 This test method covers the determination of the total nonaromatic hydrocarbons and trace monocyclic aromatic hydrocarbons in toluene, mixed xylenes, and 1.2 Total aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test method at concentrations ranging from 0.001 to 2.500 weight %. 1.2.1 A small amount of benzene in mixed xylenes or p-xylenes may not be distinguished from the nonaromatics and the concentrations are determined as a composite (see 6.1). 1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 10 carbon atoms (benzene through 1.4 In determining the conformance of the test results to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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.
Standard Guide for Quality Control and
Quality Assurance Procedures for Aromatic Hydrocarbons and Related
Materials (Includes all amendments and changes 10/20/2020). Standard Practice for Using Significant
Digits in Test Data to Determine Conformance with
Specifications Standard Practice for Gas Chromatography
Terms and Relationships (Includes all amendments and changes
4/28/2021). Standard Practice for Conducting an
Interlaboratory Study to Determine the Precision of a Test
Method Standard Practice for Installing Fused
Silica Open Tubular Capillary Columns in Gas Chromatographs Standard Practice for Packed Column Gas
Chromatography Standard Test Method for Trace Impurities
in Monocyclic Aromatic Hydrocarbons by Gas Chromatography
(Withdrawn 2016) Standard Specification for Nitration
Grade Toluene Standard Practice for Sampling and
Handling Liquid Cyclic Products Standard Test Method for Density,
Relative Density, and API Gravity of Liquids by Digital Density
Meter Standard Practice for Preparation of
Liquid Blends for Use as Analytical Standards Standard Terminology of Aromatic
Hydrocarbons and Related Chemicals Standard Specification for High Purity
p-Xylene Standard Specification for Xylenes for
p-Xylene Feedstock Standard Test Method for Analysis of
Toluene by Capillary Column Gas Chromatography (Withdrawn 2018) Standard Test Method for Benzene,
Toluene, Xylene (BTX) Concentrates Analysis by Gas Chromatography
(Withdrawn 2018) |
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