METHOD OF MEASURING AMMONIAC NITROGEN IN WATER

摘要

PURPOSE:To decrease the consumption of a buffer soln. by superposing a protective film holding ammonia oxidation bacteria on its skin layer and a cation exchange film to integrate the entire part and constituting an ammonia sensor of a flow passage for the buffer soln. between the holding film side of the immobilizing film and a dissolved oxygen detector and a flow passage for the water to be measured on the cation side of the cation exchange membrane side of the immobilizing film. CONSTITUTION:The ammonia sensor 16 is constituted by mounting the sensor to a flow cell. The immobilizing film 34 holding the ammoniac nitrogen oxidation cells and the dissolved oxygen detector 35 are combined and the flow passage 36 is provided therebetween. The buffer soln. 20 into which the material hindering the growth of the nutritive component and heterotrophic components of the nitrogen oxidation cells is incorporated and which is relaxed the dissolved oxygen by an air pump 21 is admitted from an inflow part 41 into this flow passage 36 and is relaxed. The flow passage 38 is provided to the side opposite to the side of the film 34 in contact with the soln. 20 and test water 2 is admitted therein from an inflow part 46 and is brought into contact with the film 34. The water is discharged from an outflow part 48.