where [mathematical expression not reproducible] are the mole fraction of [O.sub.2] and [N.sub.2], respectively, and [T.sub.0] is the initial temperature of the combustion tube
. Due to the back pressure regulator, the gas injection rate was stabilized during combustion process.
5 Attach a bottom plate that extends 1 to 2 inches beyond the combustion tube
Upon inspection, heater had wrong combustion tube
Destructive byproducts that can splatter against the surrounding quartz combustion tube
also are extracted by the nozzle.
The tin capsule containing the sample is introduced via a ladle into a combustion tube
held at 975 [degrees]C in a pure oxygen environment causing the tin capsule and sample to undergo flash combustion with an exothermic reaction at 1800 [degrees]C.
In a horizontal furnace arrangement the sample is introduced into the combustion tube
on a quartz ladle, which critically enables the removal of all sample residues after combustion.
Its two-stage high-temperature combustion tube
uses a bed of quartz in the first chamber to protect the platinum catalyst in the second chamber from deposition of nonvolatile salts.
experiments were performed with three matrix types: sand, sand and clay, and sand and sand fines.
The boat is placed into a quartz ladle and introduced into the quartz combustion tube
. The ladle sits in a cool zone of the combustion tube
while the system is allowed to purge.
The boat was then placed into the combustion tube
and purged with carbon dioxide for one minute, followed by evacuation to a pressure of < 22 mm Hg.