Elemental Analyzer
The Costech Elemental Combustion System (ECS) 4010 is an elemental analyzer (EA) capable
of flash combustion of solid and liquid material and subsequent and chromatographic
separation of the various resulting gases. The packing of combustion columns, traps
and filters with reagents in various configurations allow for the removal of gases
not of interest. A gas chromatographic column in an oven allows for the separation
of various gases to reduce interference. Once gases are separated, a thermal conductivity
detector (TCD) provides information on the percent composition of carbon, nitrogen,
hydrogen, and sulfur in the resulting gases and sample. Oxygen composition of solids
and liquids can also be analyzed using a pyrolysis reaction, higher flash oven temperatures,
and different column reagents, though a TCEA is a better machine for oxygen analysis.
Isotopic composition of the sample gases is estimated by porting the resulting gases
to the MAT-253 mass spectrometer through one of the needle valves located on a continuous
flow inlet block. A Conflo IV controls the flow rates and traffic of required reference
gases from the manifold and sample gases from the ECS 4010. Additionally, the Conflo
can differentially dilute reference gases and sample gases to ensure the resulting
ionic mass intensities are in range of the MAT-253 detector cups and each other, ensuring
the highest possible precision.