This method determines trace water in LPG using Gas Chromatography (GC) with a Barrier Ionization Discharge (BID) detector. Sample is introduced to a capillary column using a dedicated valving system. Water separates from other sample components chromatographically and passes through the BID detector with a response proportional to concentration. Trace ppm concentrations are calculated by comparison to a calibration curve.
Sulfur compounds or other compounds that react with iodine potentially interfering with the Karl Fischer titration methods do not interfere.
water; lpg; GC-BID; BID; Karl Fischer Titration; Barrier Ionization Discharge; corrosion-promoting substances; liquified petroleum gas; moisture; mercaptans; H2S; sulfide; ASTM D7995
There is a need for a simplified method for the determination of trace water in LPG. This method can be used to complement, or replace Karl-Fischer methods such as D7995, particularly in samples with interferences that make determination by D7995 difficult.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: D02.H0
Staff Manager: Alyson Fick
Date Initiated: 03-25-2022
Technical Contact: Allison Mason