Name: ASTM D 7134 : 2005 : R2012
Brand: ASTM
Price: 75.00 USD

ASTM D 7134 : 2005 : R2012

Withdrawn

Standard Test Method for Molecular Mass Averages and Molecular Mass Distribution of Atactic Polystyrene by Matrix Assisted Laser Desorption/Ionization (MALDI)-Time of Flight (TOF) Mass Spectrometry (MS) (Withdrawn 2021)

Available format(s)

Hardcopy , PDF

Withdrawn date

01-22-2021

Language(s)

English

Published date

06-21-2012

Publisher

American Society for Testing and Materials

CONTAINED IN VOL. 08.03, 2015 Specifies the determination of molecular mass (MM) averages and the distribution of molecular masses for linear atactic polystyrene of narrow molecular mass distribution (MMD) ranging in molecular masses from 2000 g/mol to 35000 g/mol by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS).

1.1 This test method covers the determination of molecular mass (MM) averages and the distribution of molecular masses for linear atactic polystyrene of narrow molecular mass distribution (MMD) ranging in molecular masses from 2000 g/mol to 35 000 g/mol by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). This test method is not absolute and requires the use of biopolymers for the calibration of the mass axis. The relative calibration of the intensity axis is assumed to be constant for a narrow MMD. Generally, this is viewed as correct if the measured polydispersity is less than 1.2 for the molecular mass range given above.

1.2 The values stated in SI units are to be regarded as the standard.

1.3 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.

Note 1—There is no known ISO equivalent to this standard.

Committee	D 20
DocumentType	Test Method
Pages	7
ProductNote	Reconfirmed 2012
PublisherName	American Society for Testing and Materials
Status	Withdrawn
Supersedes	ASTM D 7134 : 2005

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