Interstitial Gas Analysis

Interstitial gases include nitrogen, oxygen, carbon, sulfur, and hydrogen dissolved in a solid material and dispersed throughout its matrix. These gases can have significant effects on the physical properties of manufactured materials. Interstitial gas analysis at ChemTrace measures N, O, C, S, and H present in solid materials from sub-ppm levels to percentage levels.

Nitrogen, oxygen, and hydrogen are measured by inert gas fusion. In this process, the sample is placed in a graphite crucible and inserted into a DC electrode furnace. An inert gas, such as He or Ar, is purged through the furnace, and a high current is passed through the crucible. The current creates a temperature above 2500˚C, causing the sample to fuse. The interstitial gases within the sample are released into the inert gas stream, and are then detected by infrared or thermal conductivity measurements.

Carbon and sulfur are measured by utilizing an RF combustion tube furnace. The sample is placed in a ceramic crucible in a high frequency induction furnace set above 2000°C. An RF field is applied, resulting in the combustion of the sample. This releases various gases (such as SO2, CO, and CO2) from the sample, which are then measured by infrared detection. These measurements are used to calculate the concentration of C and S in the sample.


For more information, please contact us:

Technology Center and Principal Laboratory

44050 Fremont Blvd

Fremont, California 94538


Phone: +1-510-687-8000

ChemTrace Northwest

12130 NE Ainsworth Circle Suite 210

Portland, Oregon 97220


Phone: +1-503-254-2828

ChemTrace Korea

517-19 Samcheonbyeongma-ro

Paltan myeon, Hwaseong-si,

Gyeonggi-do, 445-911

South Korea

Office: 031 703 3669

Mobile: 010 8993 0081

ChemTrace Hsinchu, Taiwan

No.9, Datong Road

Hukou Township Hsinchu County

30352, Taiwan


ChemTrace Tainan, Taiwan

No.7, Gongye 3rd Road

Annan District, Tainan

709, Taiwan