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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。
(TMMS), DiMe-DMOS and DiPh-DMOS were compared with those of tetramethylsiloxane (TMOS) According to the response of ammonia-modified organo-modified sol-gel ammonia sensing membrane formed by mixing different proportions of precursors, it was found that the concentration of 3: 1 (v / v) TMMS / TMOS membrane in the NH3 concentration range of 0.1-10mg / There is a good linear relationship between the detection limit of 0.01mg / ml, the response time of about 2min. Factors influencing the detection of ammonia photochemical sensitivities in water such as coexisting substances, measuring temperature and stability were also investigated. The membrane was less affected by the measured parameters and was expected to be used for the determination of trace ammonia in water.