Who used the elemental analyzer to determine soil total nitrogen? What is the principle of its determination? Does the soil carbon measured at the same time as total carbon or organic carbon?
The soil carbon measured at the same time is total carbon. If you want to analyze the organic carbon in the soil, you need to sample your samples and test the organic carbon and inorganic carbon separately
The separation unit by chromatography principle, using gas chromatography, mixed component CO2, the measured samples of H2O, N2 and SO2 into the column. Because of these components outflow in the column at different times (i.e. different retention time), so that the mixed components in accordance with N, C H S, the sequence was isolated, single gas separated, measured by the analysis of the thermal conductivity detector, thermal conductivity of different gas components in the thermal conductivity detector is different, so as to make the instrument according to the different components to produce numerical read different, and by comparing with standard sample to achieve the quantitative analysis on the analysis.
The sample under high temperature conditions, the interaction of oxygen and oxidation catalyst, to sample oxidation and reduction reaction of combustion, measured the sample into gaseous substances (CO2, H2O, N2 and SO2), and in promoting the carrier gas, into the separation detection unit.
