Online Pretreatment - Flow Injection Spectrophotometry Research And Application Of Water Quality Analysis

With the rapid economic development, the standard of living has been improved greatly, but environment is under enormous stress. Environment issues are becoming more serious, such as air pollution, water pollution, soil pollution and so on. Water pollution issue has been a major issue of social concern, so water monitoring is an important task in environmental monitoring. At present, in the face of heavy tasks and higher requirements of water quality monitoring, it is necessary to set up fast and accurate water quality analytical methods for meeting the water quality monitoring objectives and requirements. In many water quality analytical methods, flow injection analysis is an automation technology that has many advantages. Flow injection analysis that is connected with kinds of detectors shows larger advantage, it has a promising application.The applications of flow injection combined with spectrophotometry in water quality analysis were described in the thesis. The thesis has two parts, part one is summary, part two is experiment research.The first part is a main summary about the research status of water quality analysis, flow injection analytical technology and the applications of flow injection analysis in water quality analysis. The principles of flow injection analysis, the characteristics of flow injection analysis and flow injection system were introduced in the chapter of flow injection analysis technology. The basic principles of flow injection spectrophotometric method, flow injection atomic spectroscopy, flow injection chemiluminescent and flow injection electrochemical method were further elaborated.The studies that anionic surfactant, volatile phenols, cyanide and total phosphate were determined by flow injection spectrophotometric method were reported in part two. In the thesis, experimental conditions, instrument conditions and module device conditions were discussed and optimized. Under the determinate experimental conditions, the experimental results which included linear range, precision, detection limit and accuracy are satisfactory. The devices of on-line extraction in determination of anionic surfactant, on-line distillation in determination of volatile phenols and cyanide, on-line digestion in determination of total phosphate, made the whole analytical process simple and fast. These methods are suitable for determination of a large number of samples. The results of experiments meet the requirement of water quality analysis.