Analytical apparatus for determining the concentration of an analyte and corresponding method

An analytic apparatus for determining the concentration of an analyte in a liquid sample, wherein the analyte is an oxidizable component, the analytic apparatus comprising:

• a dosing apparatus, including a pump, configured to dose the liquid sample into a high-temperature digestion apparatus, which is configured to digest the liquid sample, thereby forming a gas mixture, wherein the high-temperature digestion apparatus includes a reaction vessel with a liquid inlet for dosing the liquid sample and a gas supply line configured to supply a carrier gas, which is connected to an analysis chamber via a gas outlet,
• wherein, during operation of the analytic apparatus, a gas stream of the carrier gas forms between the gas inlet and the analysis chamber,
• wherein a pressure sensor is arranged upstream from the analysis chamber within the gas supply line in a direction of the gas stream,
• wherein the pressure sensor is coupled to a control unit configured to further process the pressure signals output by the pressure sensor,
• wherein a first flow rate sensor is arranged upstream from the analysis chamber in the direction of the gas stream,
• wherein the first flow rate sensor is coupled to the control unit for further processing of the flow rate signals output by the first flow rate sensor, and
• wherein a second flow rate sensor is arranged downstream from the analysis chamber in the direction of the gas stream,
• wherein the second flow rate sensor is coupled to the control unit for further processing of the flow rate signals output by the second flow rate sensor.