Simplified automatic measurement method for nutrient at coastal field

Some of the environmental factors such as dissolved oxygen, chlorophyll, and so on can be measured by electric sensor recently. It enables to measure these continually and automatically. This kind measurement is very important for monitoring of the environments of coastal area. However, it is difficult to measure the chemical parameters continuously, because it always should be obtained by chemical analysis. In This work, simplified measurement system using the method of absorption rate measurement of processed water by the visible ray is developed. The effectiveness of the present method is shown in the field measurement in Osaka Bay.