ASTM D4864 Test Method for Determination of Traces of Methanol in Propylene Concentrates by Gas Chromatography
1. Scope
1.1 This test method covers the determination of methanol in propylene concentrates in the range of approximately 4 mg/kg to 40 mg/kg (parts-per-million by mass).
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
NOTE 1 - There is no direct acceptable SI equivalent for screw threads.
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. Specific warning statements are given in 11.1.1, 11.2.1, and 12.11.
2. Referenced Documents
2.1 ASTM Standards:
D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards
E260 Practice for Packed Column Gas Chromatography
3. Terminology
3.1 Definitions:
3.1.1 propylene concentrate - concentrate containing more than 90 % propylene.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 outage tube - a length of tubing, usually metal, attached to the inside of a valve on a high pressure sampling cylinder such that a fixed percentage of liquid may be expelled from the cylinder to create a specified ullage or vapor space for safety in storage, handling, and transportation.
3.2.1.1 Discussion - Typically the outage tube is designed to allow a ullage or vapor space of 15 % to 20 % of the volume of the sample cylinder.
