Function of blank solution in standard addition method

In various analytical methods, in order to eliminate interference, the solution is determined under the same conditions as when the sample is determined. The measurement result is called "blank value" and should be deducted from the measurement result of the sample to improve the accuracy of the determination. Or in colorimetric analysis, in order to eliminate the interference of chromogenic agent and various colored substances in the sample, and the influence of colorimetric cup and reagent on incident light, the instrument is adjusted by using a solution with a percent transmittance of 100%.