Online automatic determination method for concentration of phosphoric acid and sulfuric acid in chemical polishing tank

The invention discloses an online automatic determination method for phosphoric acid and sulfuric acid concentration of a chemical polishing tank. The method comprises the following steps: S1, respectively extracting a sample solution by a first peristaltic pump and extracting pure water by a second peristaltic pump to carry out cleaning, rinsing and defoaming treatment on a reaction cup and a pipeline; quantitative sample water is extracted to a reaction cup, quantitative pure water is accurately added, and automatic stirring is performed; s2, titrating 0.5 N of a sodium hydroxide standard solution by using a third peristaltic pump, judging a chemical variable point by using a potentiometric titration method, and calculating the step number of the first titration; s3, continuously titrating 0.5 N of the sodium hydroxide standard solution by using a third peristaltic pump, judging chemical variable points of the solution by using a point titration method, and calculating the step number of second titration; a