研究了在碱性介质中， 基于氨（ 铵离子） 与邻苯二甲醛及2 - 巯基乙醇反应生成强荧光性吲哚取代衍生物的体系测定微量氨（ 铵离子） 的流动注射荧光分析法. 非离子表面活性剂曲拉通X-100 （TrITOn X- 100） 对该体系具有良好的增稳作用. 研究了该体系测定氨（ 铵离子） 的最佳实验条件. 测定氨（ 铵离子） 的线性范围0 ~0-7Mg/l， 相对标准偏差为1-3 % （ CnH3 ＝ 0-2Mg/l，n ＝ 11） ，检测限为0-0012Mg/l.A method is described for determination of trace ammonia by fluorescence spectrophotometer combining with flow-injection Analysis.The method is based on the system:in base media,ammonia reacts with o-phthaladehyde(OPA) and 2-mercaptoethanol(ME) producing derivative of indol which has intensive fluorescence.Nonionic surfactant Triton X-100 enhances stability in the system.The optimum reaction condition is investigated.A linear relationship between ammonia concentration and fluorescent intensity is observed over the range 0 1～0 7mg/L with a relative standard deviation(RSD) of 1 3% at ammonia concentration of 0 2 mg/L(n=11).The limit of determination is 0 001 2mg/L.国家863计划资助!（818－Q－09
