DB Lab is performing elemental analysis of carbon, hydrogen, nitrogen, sulphur, and oxygen (CHNS-O). The analysis is performed as a double determination and under the GMP quality system.
Until 30.04.2018, the elemental analyses were performed according to methods approved by DANAK • The Danish Accreditation Fund.
The principle in elemental analysis (for CHNS) is cusbustion of the sample at elevated temperatures (900-1060 °C) under controlled supply of oxygen. During the combustion, carbon, hydrogen, nitrogen and sulfur are converted to CO2, H2O, N2 og SO2, respectively. These gasses passes through a cupper catalysts, after which they are detected by gas chromatography.
When analysing for oxygen, helium is added and oxygen is converted to CO by incomplete combustion at 1060 °C using a catalyst. Other gasses developed are removed, and carbonmonooxide is detected by gas chromatography.