ASTM International

Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Weak Anion Exchange High Performance Liquid Chromatography
 N D7883

Annotation

This test method2 covers the determination of the 4-Carboxybenzaldehyde (4-CBA) and p-Toluic acid (p-TOL) in purified terephthalic acid (PTA) by weak anion exchange high performance liquid chromatography (HPLC). This method is applicable for 4-CBA from 2 to 500 mg/kg and for p-TOL from 10 to 500 mg/kg, respectively.

In determining the conformance of the test results using this method to applicable specification, results shall be rounded off in accordance with the rounding-off method of Practice E29.

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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.

2 This standard is based on SH/T 1612.7-1995 Purified terephthalic acid for industrial use—determination of p-Toluic Acid, 4-Carboxybenzaldehyde-HPLC, copyright SINOPEC, 22 Chaoyangmen North Street, Chaoyang District, Beijing, China 100728. A copy of SH/T 1612.7-1995 may be obtained from China Petrochemical Press, www.sinopec-press.com.

Автоматический перевод:

Метод Стандартной пробы для Определения 4-Carboxybenzaldehyde и P-толуиловой-кислоты в Очищенной Терефталевой кислоте Слабой Высокоэффективной Жидкостной хроматографией Анионного обмена