Sample analysis apparatus and sample analysis method

A sample analysis method of using a sample analysis apparatus to determine a concentration of a specified substance contained in a sample solution,

• wherein the sample analysis apparatus comprises
• a pump arranged on a main pipe,
• a channel switch unit having a main port connected to the main pipe and a plurality of sub-ports and configured to select one of the sub-ports that is connected to the main port,
• a mixing container provided on the main pipe between the pump and the main port, and
• a detection unit configured to detect a concentration of the specified substance contained in a sample solution extracted from a treatment solution used for surface treatment of a metal material,
• wherein the plurality of sub-ports include
• a sample port connected to a sample pipe supplied with the sample solution,
• a reagent port connected to a reagent pipe supplied with a reagent solution, and
• a detection port connected to a detection pipe on which the detection unit is arranged,
• the sample analysis method comprising:
• a control step of controlling the pump and the channel switch unit so as to connect the reagent port to the main port to draw the reagent solution from the reagent pipe to the mixing container, connect the sample port to the main port to draw the sample solution from the sample pipe to the mixing container, re-connect the reagent port to the main port to draw the reagent solution from the reagent pipe to the mixing container, and connect the detection port to the main port to supply a mixture solution containing the sample solution and the reagent solution from the mixing container to the detection unit;
• and
• a detection step of determining a concentration of the specified substance contained in the mixture solution by using the detection unit.