Take 100ml of water for acidity, add 0.2ml of methyl orange indicator solution, mix well, take 50ml of each, place them in two colorimetric tubes A and B, add 1.0ml of hydrochloric acid titrant (0.01mol/L) in tube B, shake well; After introducing 1000ml of this product into tube A (at a speed of 4000ml per hour), the red color should not be darker than that of tube B.
The above are the requirements for carbon dioxide in the pharmacopoeia. Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. provides gas flow meters according to the requirements. Welcome to consult and negotiate.