On-site online instruments-----How to detect the concentrations of two liquids in three mixtures online

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If you want to measure the concentration of a single-component liquid, such as sulfuric acid or hydrochloric acid, ultrasound, refractometers, conductivity meters, etc., can be used. However, if there is an additional component in the liquid that needs to be measured, simple ultrasound or refractometers cannot detect it. However, by adding a physical property (conductivity) to the ultrasonic concentration meter for concentration measurement, it is possible to calculate the concentrations of two of the three components. For example, in the chlor-alkali industry: the detection of free alkali and available chlorine in sodium hypochlorite, potassium hydroxide and hypochlorite ions, HF and H2SO4, hydrogen chloride and methanol. Metal pickling processes: TOTAL Fe+HCL, hydrogen chloride+aluminum chloride, etc. Semiconductor etching solutions, cleaning solutions: TMAH+resist, HF+H2SiF6, BOE (hydrofluoric acid+ammonium fluoride), SC1, SC2, HF+H2O2, CMP+H2O2, TMAH+Si, etc. It is currently known that more than 500 multi-component concentrations can be detected. Management of chemical production processes