Water Quality Data Analysis And Detection Of Ammonia Nitrogen Based On Nessler Spectrophotometric Method

Ammonia water quality testing is an essential one of water quality testing, common ammonia water quality testing methods include spectrophotometry, electrochemical analysis and flow method, Nessler ammonia test method is the national standard method of Ammonia testing.This thesis describes a simple spectrophotometric method and the Lambert Beer law, the whole introduced Nessler spectrophotometric method based on the design of an ammonia concentration of the detection system components and the principle, and then elaborated data acquisition systems, and ammonia concentration detection software, data acquisition system by the AVR microcontroller data acquisition and filtering, ammonia concentration detection software is written using DELPHI 7.0, and through the ACCESS database, signal acquisition and analysis of relevant data in the storage memory. Described in detail in the single chip data acquisition system driven by controlling the motor rotation monochromator wavelength selection, filter design. Ammonia concentration function of the software is divided into three modules: system settings, data analysis and data storage testing, each module also contains several sub-modules. Among them, the data analysis module for the software detected the core modules, including the value of looking for the maximum absorption wavelength, different wavelengths of light concentration on the absorbance of continuous sampling and analysis, the color absorbance of the solution time, the standard curve and the determination of ammonia concentration measurements. Then through the experiment to affect absorbency correlative factors on the analysis, the conclusion conforms to the principle of Nessler test method, verify the accuracy and reliability of the system. In conclusion, the article on the work accomplished are summarized, and the future direction of development.