Automated analysis apparatus

An automatic analysis device comprising:

• a measurement unit which measures the concentration of target ions included in a specimen;
• a liquid supply unit which supplies the specimen and an internal standard solution to the measurement unit;
• a calculation unit which measures the internal standard solution between the measurement of a first specimen and measurement of a second specimen to be supplied after the first specimen, and calculates a measurement value of the second specimen based on a measurement result of the internal standard solution;
• and
• a control unit which controls the supply of the internal standard solution to the measurement unit, based on a difference between the concentration of the target ions included in the first specimen and the concentration of target ions included in the internal standard solution or the second specimen,
• wherein the control unit determines, before the liquid supply unit supplies the second specimen, whether a first concentration of the target ions included in the first specimen is greater than a second concentration of the target ions included in the internal standard solution or the second specimen, by a reference value or greater,
• when it is determined that the first concentration is greater than the second concentration by a reference value or greater, the control unit controls the liquid supply unit so as to supply a liquid other than the specimen in addition to the internal standard solution, between the time when the liquid supply unit supplies the first specimen and the time when the liquid supply unit supplies the second specimen,
• the control unit calculates a measurement result of a concentration of the target ions included in the specimen by using a measurement result of the concentration of the target ions included in the internal standard solution,
• the control unit executes a preparation operation for the measurement unit to measure a concentration of the target ions included in the internal standard solution while the measurement unit measures the concentration of the target ions included in the specimen,
• the control unit executes a preparation operation for the measurement unit to measure the concentration of the target ions included in the specimen while the measurement unit measures a concentration of the target ions included in the internal standard solution,
• when it is determined that the first concentration is greater than the second concentration by the reference value or greater, the control unit controls the liquid supply unit so as to supply the internal standard solution while the measurement unit measures the concentration of the target ions included in the first specimen, and further controls the liquid supply unit so as to supply the internal standard solution again before beginning a preparation operation for the measurement unit to measure the concentration of the target ions included in the second specimen,
• the control unit executes a preparation operation for the measurement unit to measure the concentration of the target ions included in the second specimen while the measurement unit measures the concentration of the target ions included in the internal standard solution which is supplied again, and
• the control unit starts a preparation operation for the measurement unit to measure the concentration of the target ions included in the internal standard solution which is supplied again while the measurement unit measures the concentration of the target ions included in the internal standard solution which is supplied.