Study On Automated Sampling And Monitoring Technology For Measuring Contaminant Flux Across Marine Sediment And Water Interface

Intensive anthropogenic activities have been causing substantial deterioration in coastal ecological environment, which restricts the sustainable development of human beings in return. More than 80 percents of marine pollutants come from land-sourced discharge, while more than 90 percents of marine pollutants will enter marine sediments, wetlands and marine ecological systems. In a word, marine sediments has become the main reservoir of persistent and poison chemical pollutants in marine environment. Unfortunately, marine sediments is also the most important transfer station of marine nutrients in biogeochemical cycle, whose"health"is vital for marine ecosystem, which could be harmful for human beings through food chain effect. For this reason, monitoring the pollutant status of marine sediment and water interface is meaningful.At present, the research focused on this domain internationally has become a new independent system. In the meanwhile, research in our nation is still at its early stage. Relevant in situ measurement equipments and monitoring systems are scanty especially."Automated sampling and monitoring technology for pollutant flux in marine sediment and water interface", sponsored by Chinese national programs for high technology research and development (863 Program), is to develop a device for in situ automated sampling and monitoring for consistent time series, which would improve the actuality of water sample in the interface and provide a method for quantifying the pollutant flux in marine sediment and water interface.The study includes following aspects:Aiming at the demand of trace heavy metal monitoring in marine sediment and water interface, polycarbonate sampling bottle, sampling box and water pipeline is adopted to avoid contaminating.Water cycling subsystem and dissolved oxygen monitoring subsystem are developed to model surrounding marine environment, which ensure the similarity between sample and surrounding water. Based on the selection of sensors, valves and corresponding devices, the hardware solution and software design of control system are realized.The subject is proved to be accomplished, which provides solid foundation for succeeding research.