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Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Capillary Electrophoresis with Normal Voltage Mode
NORMA vydaná dňa 1.11.2019
Označenie normy: ASTM D7882-19
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.11.2019
Kód tovaru: NS-979007
Počet strán: 7
Približná hmotnosť: 21 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
capillary electrophoresis, purified terephthalic acid, 4-carboxybenzaldehyde, p-toluic acid, normal voltage,, ICS Number Code 71.080.40 (Organic acids)
Significance and Use | ||||||||||||||||
5.1 The presence of 4-CBA and 5.2 Determining the amount of 4-CBA and 5.3 This test method is intended as an alternative to the HPLC method for determination of 4-CBA and 1.1 This test method covers the determination of 4-carboxybenzaldehyde (4-CBA) and p-toluic acid (p-TOL) in purified terephthalic acid (PTA) by capillary electrophoresis (CE) with normal voltage mode and UV detection. It is applicable for 4-CBA from 5 to 400 mg/kg and for 1.2 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. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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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