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Results
Automatic Measurement of Dissolved Inorganic Nitrogen Ions In Coastal Field Using a Simplified Flow Injection Method
Arai, Rei (Osaka Prefecture University Osaka, Japan) | Tada, Koji (Osaka Prefecture University Osaka, Japan) | Nakatani, Naoki (Osaka Prefecture University Osaka, Japan) | Okuno, Taketoshi (Osaka Prefecture University Osaka, Japan) | Ohta, Koichi (Toyota Motor Corporation Aichi, Japan)
ABSTRACT Recently, measurement of certain environmental factors such as dissolved oxygen and chlorophyll using electric sensors has been realized. Such measurement is continuous and automatic, and is very important for monitoring the environment in coastal areas. However, it is difficult to continuously measure the chemical parameters because data must be obtained by chemical analysis. This paper introduces a simplified measurement system using absorption rate measurement of processed water by visible rays. The effectiveness of the present method is demonstrated in field measurements in Osaka Bay. INTRODUCTION Since the 1960's, economic growth has caused an increase in the pollution of water around coastal areas in typical enclosed seas such as Osaka Bay. Recent technical innovations and countermeasures for emission sources have gradually improved the water quality; however, it has not yet been improved around urban coastal areas despite considerable and varied research, because the natural capacity for the emission source has already reached the ecological limitation with fundamental waste, such as industrial, domestic and wastewaters. These many kinds of wastewater contain high concentrations of nutrients and organic matter, which can lead to the so-called eutrophication phenomenon in coastal seas. Eutrophication of coastal waters has caused various environmental problems including red tide, anoxic water and so on. In order to deal with these problems appropriately, it is important to continuously and automatically measure these factors with high resolution in time and space, thereby providing a good understanding of coastal sea ecosystems. Some electric and optical sensors allow for the measurement of certain environmental factors, such as salinity, dissolved oxygen and chlorophyll concentration. Such methods can be easily put to practical use for continuous and automatic measurement in the field. In order to monitor nutrient concentration in the ocean, measurement of dissolved inorganic nitrogen (DIN) is most important because it is useful for understanding specific behavior of phytoplankton as the primary production.
Measurement Method For Nutrient By Ultraviolet Spectrometry
Arai, Rei (Osaka Prefecture University, Marine System Engineering, 1-1,Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan) | Nakatani, Naoki (Osaka Prefecture University, Marine System Engineering, 1-1,Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan) | Okuno, Taketoshi (Osaka Prefecture University, Marine System Engineering, 1-1,Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan)
ABSTRACT Some of the environmental factors such as salinity, dissolved oxygen, chlorophyll concentration, and so on, can be measured by electric or optical sensor. It enables to measure these continuously and automatically with high resolution in time and space. It is very important for monitoring of marine environment. In order to understand ecosystem of sea in detail, distribution or change of nutrient concentration should be measured in terms of primarily production. Generally, since seawater contains high concentrations of chloride, bromide and so on, nutrient must be extract from these ions. It has brought difficulty of measuring automatically. The water sampling and chemical analysis in the laboratory has been always made. In this paper, a simplified method for measuring nitroxide concentration in seawater using ultraviolet spectrometry is proposed. The present method is superior to the conventional one in terms of the non-necessary chemical processing. The effectiveness of the present method is shown by the field measurement in Seto Inland Sea. INTRODUCTION Recently, eutrophication in coastal field has caused many kinds of environmental problems such as red tide, anoxic water and so on. In order to deal with these appropriately, it is important to measure these factors continuously and automatically with high resolution in time and space. It must give good understanding to ecosystem of coastal sea. A particular electric or optical sensor enables us to measure some of the environmental factors such as salinity, dissolved oxygen, chlorophyll concentration and so on. It easily put into practical use of the continuous and automatic measurement in the field. However, the chemical parameters such as nitrate (NO3), nitrite (NO2) ions are always analyzed in a laboratory. It is very difficult to measure on site because of its time consumption and complexities of chemical process.