比较了四甲基硅氧烷(TMOS)分别与甲基三甲氧基硅烷(TMMS)、二甲基二甲氧基硅烷(DiMe-DMOS)和二苯基二甲氧基硅烷(DiPh-DMOS)按不同比例混和作为前驱体所形成的有机改性溶胶-凝胶氨传感敏感膜对氨的响应情况,发现3∶1(v/v)TMMS/TMOS膜在0.1~10mg/ml NH3浓度范围内有较好的线性关系、检测限达0.01mg/ml、响应时间为2min左右。对影响水体中氨光化学传感检测的因素如共存物质、测定温度、稳定性等也作了考察,该膜受测定参数影响较小,有望用于水体微量氨的测定。The responses of the optical sensing films for ammonia were investigated.Organically modified silicates(ORMOSILSs),such as methyltrimethoxysilane(TMMS),dimethyldimeth-oxysilane(DiMe-DiMOS) and diphenyldimethoxysilane(Diph-DiMOS) and tetramethoxysilane(TMOS),were selected as precursors for the sensing films preparation.The properties and the behaviors of the ammonia-sensing films were compared and investigated.The detection limit for ammonia in water was 0.01μg/ml,and the linearity of fluorescent intensity and ammonia concentration ranged from 0.1 to 10μg/ml,the response time was 2min for the best response characters among the films.Moreover,some factors,such as coexisting substances,measurement temperature and stability,were also studied.国家高技术研究发展计划(863计划)环境与资源领域资助项目(2001AA635100);; 福建省自然科学基金资助项目(D0410001
