ANR Analytical Lab - 320

320

320 TOTAL NITROGEN AND CARBON - COMBUSTION METHOD

Fertility: N, C
Combustion gas analyzer method for total nitrogen and total carbon.

Summary: This analytical method quantitatively determines the total amount of nitrogen and carbon in all forms in soil using a dynamic flash combustion system coupled with a gas chromatographic (GC) separation system and thermal conductivity detection (TCD) system. The analytical method is based on the complete and instantaneous oxidation of the sample by “flash combustion” which converts all organic and inorganic substances into combustion gases (N₂, NO_x, CO₂, and H₂O). The method has a detection limit of approximately 0.02% for carbon and nitrogen.

Sample material must be ground to the consistency of fine powder for these analyses.

Sample amount requested: 2 g allows for full quality control.

Questions concerning limited sample size can be answered by the DANR Analytical Laboratory.

AOAC Official Method 972.43, Microchemical Determination of Carbon, Hydrogen, and Nitrogen, Automated Method, in Official Methods of Analysis of AOAC International, 16th Edition (1997), Chapter 12, pp. 5-6, AOAC International, Arlington, VA.