摘要
应用氨气敏电极、高输入阻抗运放放大器和微处理器,设计基于电化学方法的智能氨氮测量仪器,内容包括氨气敏电极的测量原理、传感器信号处理电路设计、标定的实现和浓度计算方法、斜率等浮点类型参数的保存和读取、自动温度补偿算法,以及微处理器、ADC电路和显示部件的设计要点等。和相关文献讨论的氨氮测量方法比较,仪器自动化程度高,具有无需调零、标定简便、显示直观和自动温度补偿等优点,测量结果直接以mg/L为单位显示。仪器操作简便,只需加入NaOH碱化试液,分析速度快,可用于海水、地表水、工业废水中的氨氮的直接测量和土壤的氨氮的间接测量。测量范围(0～1 400)mg/L,精确标定后,测量误差小于±2%。讨论的设计方法不仅适用于便携式和在线式电化学仪器的开发和设计,对于智能仪表的不开壳调试、自动校准、以及各种传感器信号处理同样具有参考意义。
Applying ammonia electrode, high input impedance operational amplifier and MCU, the intelligent ammonia nitrogen measurement instrument was designed. The content includes electrode working principle, sensor signal process circuit design, auto calibration and concentration calculation, loading and storing methods of floating point number, temperature compensation algorithm, and the design points of MCU, ADC and display. Compared with the ammonia nitrogen determination methods discussed by related literature, the automation level of instrument is high, and it has the advantage of no need for zero-set, convenient calibration, direct information display and automatic temperature compensation, and the measured result can be displayed at mg/L. The instrument operation is simple by just adding NaOH to alkalize the test solution, and the analysis speed is fast . The instrument can be used for direct ammonia nitrogen determination in seawater, surface water or industrial wastewater, and indirect measurement in soil. The measuring range is （0-1 400） mg/L with the error less than ~2% after accurate calibration. The design methods discussed is not only suitable for the development and design of portable and online electrochemical instrument, but also has great reference significance to the not open shell adjustment and auto calibration of intelligent instrument and sensor signal process.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2010年第5期587-590,共4页
Computers and Applied Chemistry
基金
国家"十一五"科技支撑计划(No2008BAJ08B13)资助项目子课题名称:农村住宅污染物快速检测技术及规程研究
关键词
氨气敏电极
氨氮测量
浮点数存取
自动标定
温度补偿
ammonia electrode, ammonia nitrogen determination, loading and storing floating point number, automatic calibration, temperature compensation
