阐述了采取在流动注射体系中加气体扩散装置的方法,让水样中的NH3——N与NaOH载液反应生成NH3后透过气体分离膜,再在溴百里香酚兰吸收液中反应变色,用分光光度法测定。结果表明,在0～50mg/l区间内浓度与吸光度成良好的线形,其相关系数为0.995。本法测定水中NH3——N的含量,回收率达99%。 The method of adding gas diffusing device in flow injection system is described. The NH3 - N in water sample is reacted with NaOH carrier liquid to generate NH3 and then permeate through the gas separation membrane. The reaction is discolored in bromothymol blue absorption liquid, Measured spectrophotometrically. The results showed that in the range of 0 ~ 50mg / l the concentration and absorbance became a good linearity with a correlation coefficient of 0.995. The determination of NH3 - N content in water, the recovery rate of 99%.