Faster D6730 DHA Using Hydrogen Carrier Gas

ASTM D6730 Detailed Hydrocarbon Analysis (DHA) is a chromatographic method that determines the individual hydrocarbon components of spark-ignition engine fuels. It is often referred to as PONA and/or PIANO analysis. The official ASTM D6730 Method specifies the use of Helium as the carrier gas.  In recent years Helium has become less available, and, as a consequence, more expensive. Switching to the use of Hydrogen as a carrier gas is not only more economical but its chemical properties affect linear velocities […]