以硫酸为介质,用适宜的氧化剂氧化卤化物生成卤单质(X2),用载气载出,被显色剂(CD-4)吸收,生成一种有色化合物,在510nm处测其吸光度.并对实际水样进行了分析. Using sulfuric acid as the medium, the halides were oxidized with a suitable oxidizing agent to generate halogen (X2), which was carried with a carrier gas and absorbed by a chromogenic reagent (CD-4) to form a colored compound which was measured for its absorbance at 510 nm. The actual water samples were analyzed.