采取在流动注射体系中加气体扩散膜装置的方法,让水样中的NH。在NaOH载液中转变成NH;后扩散透过气体分离膜,再在 HZSO4吸收液中又重新转变成 NH 4”,以此在线分离出水样中微量 NH 4“后用靛酚蓝光度法测定。结果表明,在 5-80 P g/mL和200-500 p g/mL这2个区间内分别与吸光度呈现良好的线性,其相关系数分别为0.994和0998。对500pg/mL样品10次测定的RSD为16％,测定速度达到18个人。用本法测定几种水样中NH:的含量,回收率达96％-102％。 Adopting the method of adding gas diffusion membrane device in flow injection system to let NH in water sample. In NaOH carrier liquid into NH; diffuse through the gas separation membrane, and then re-converted into NH4 “in the HZSO4 absorption liquid, thus online separation of trace NH4 in water sample”, with indophenol blue photometry Determination. The results showed that there was good linearity with absorbance in the range of 5-80 Pg / mL and 200-500 pg / mL respectively, with correlation coefficients of 0.994 and 0998, respectively. The RSD for 10 determinations of 500 pg / mL samples was 16% and the assay speed reached 18 individuals. This method is used to determine the NH: content of several water samples, the recovery rate of 96% -102%.