The acid-base titration method adopts acid distillation, hydrogen peroxide reception, and alkaline titration, which is similar to the Chinese food national standard "Determination of Sulfur Dioxide in Food" and is a classic method for the determination of sulfur dioxide,The advantage isThis method is simple, using nitrogen to protect the distilled sulfate ions during the distillation process, reducing interference, and can directly provide data after titration without the need for special reagents. It has low detection costs and is easy to popularize. During operation, the airtightness of the instrument should be ensured, and the instrument pipeline should be clean without residual sulfur dioxide. First, replace the air inside the instrument with nitrogen gas at a flow rate of about 0.2L/min, and evenly discharge the bubbles in the collection bottle.When testing the sulfur dioxide content in liquid samples, shake themshakeRemove carbon dioxide from the sample or by ultrasonic heating, as carbon dioxide is consumed during titrationliquidDue to the instability of hydrogen peroxide in the absorption solution, it is prone to decompose into water and oxygen, requiring immediate use and preparation. traditional Chinese medicinematerialHigh starch content, testingsampleIn powder formtimeBefore weighing the sample, it is necessary todigestionAdd distilled water to the tube and shake the sample well to prevent clumping during the experiment, which may result in lower results.