1.1 This practice covers information for the storage and use of LPG samples in standard cylinders of the type used in sampling method, Practice D 1265
1.2 This practice is especially applicable when the LPG sample is used as a quality control (QC) reference material for LPG test methods, such as gas chromatography (GC) analysis (Test Method D 2163
LPG samples can change composition during storage and use from preferential vaporization of lighter (lower molecular weight) hydrocarbon components, dissolved inert gases (N2, Ar, He, and so forth) and other dissolved gases/liquids (NH3, CO2, H2S, H2O, etc.). Careful selection of cylinder type, cylinder volume, and use of inert gas for pressurizing cylinders is required to ensure that composition changes are small enough to maintain the integrity of LPG when used as a QC reference material for various LPG test methods.
Monitoring of ongoing precision and bias on QC materials using control chart techniques in accordance with Practice D 6299
SDO | ASTM: ASTM International |
Document Number | D6849 |
Publication Date | Dec. 1, 2007 |
Language | en - English |
Page Count | 4 |
Revision Level | 02(2007) |
Supercedes | |
Committee | D02.08 |