ASTM-D4735 › Historical Revision Information
Standard Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography
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Scope
1.1 This test method covers the determination of thiophene in refined benzene in the range from 0.5 mg/kg to 5.0 mg/kg. The range of the test method may be extended by modifying the sample injection volume, split ratios, calibration range, or sample dilution with thiophene-free solvent.
1.2 This test method has been found applicable to benzene characteristic of the type described in Specifications D 2359 and D 4734 and may be applicable to other types or grades of benzene only after the user has demonstrated that the procedure can completely resolve thiophene from the other organic contaminants contained in the sample.
1.3 The following applies to all specified limits in this test method: for purposes of determining conformance to applicable specification using this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit in accordance with the rounding-off method of Practice E 29.
1.4 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. For specific hazard statements, see Section 7.
Significance and Use
This test method is suitable for setting specifications on benzene and for use as an internal quality control tool where benzene is either produced or used in a manufacturing process.
This test method was found applicable for determining thiophene in refined benzene conforming to the specifications described in Specification D 2359
This test method was developed as an alternative technique to Test Method D 1685
Keywords
benzene; flame photometric detector; gas chromatography; thiophene; ICS Number Code 71.080.15 (Aromatic hydrocarbons)
To find similar documents by ASTM Volume:
06.04 (Paint -- Solvents; Aromatic Hydrocarbons)
To find similar documents by classification:
71.080.15 (Aromatic hydrocarbons)
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Document Number
ASTM-D4735-02
Revision Level
2002 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
July 10, 2002
Document Type
Test Method
Page Count
5 pages
Committee Number
D16.04