Chiang Mai Journal of Science

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 There is a growing need for rapid and reliable but relatively low cost techniques that can be remotely deployed to provide high quality environmental data. This paper describes the use of flow injection (FI) based instrumentation for aquatic environmental monitoring. FI techniques now impact on a wide cross section of analytical chemistry activities, providing imaginative and practical solutions to challenging analytical problems and contributing to the improvement of data quality. Two specific applications are described. The first is the use of flow injection with spectrophotometric detection (FI-SPEC) for the determination of nitrogen and phosphorus species in catchments, estauries and sediments in order to investigate the impact of nutrients on water quality and provide decision support systems for catchment management. The second is the use of flow injection with chemiluminescence detectin (FI-CL) for the determination of micronutrients (particularly iron) in remote, open ocean environments. As a rate limiting nutrient, iron plays a key role in ocean productivity and climate change. The importance of 'clean' analytical protocols in order to provide high quality environmental data are also cosidered. 

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