Research On The On-line Water Quality Monitoring Technology Based On UV Spectrum Analysis Method

Water is the essential source of all kinds of things and the basic survival condition for human and other living things. Water pollution poses a serious threat on the people's lives and water environment. How to monitor water source quality and protect water from pollution is becoming a major issue for ensuring our country's economy to sustainablely develope. At present, the main methods for water quality measuring are mostly chemical methods, which are time-consuming; operation complicated and easily leads to secondary pollution for many reagents existing. So it is not suitable for online monitoring and can not provide the most scientific data for relevant management departments in time.As a synthetical pollution index, ultraviolet absorbance has been available for many years; it has been listed as a formal water quality monitoring indicator in Europe and Japan because it can detect the chemical oxygen demand, concentration of nitrate nitrogen and other parameters quickly to predict water pollution condition. We have described the development of water quality parameters detecting and the modern research processing home and abroad briefly. And also the principles of the UV spectrum were analyzed deeply. Based on the advantages of this method, this paper developed a new instrument for water quality multi-parameter monitoring. Great emphasis was specially focused on the detecting system designing and the implementation of the experiments verifying the basic performance of this system, such as time drifting, repeatability, et.al, all according to the national standards. Finally, real water samples were carried on for long-term monitoring to acquire effective data. At the same time, the feature rules of this water are discovered and further the accuracy and reliability of this instrument are validated. In summary, this system has a series of advantages, such as simple-operated, no reagent, and no secondary pollution, data communication by wireless, being faster and better in real-time monitoring and so on. So it can be widely used for online, real-time measurement in lakes, rivers, and oceans in the future.