Calibration of internal standard method, external standard method and standard addition method. China instrument network information display.

1. Calibration methods include internal standard method, external standard method and standard addition method. The internal standard method is to add an internal standard substance with known concentration to the sample to eliminate the measurement error of the analytical instrument.

2. The external standard method is to determine a series of standard solutions with known concentrations in turn and construct a standard curve.

3. The standard addition method is to add a standard substance with a known concentration to the sample and determine the concentration of elements in the sample.