| 摘要 |
PURPOSE:To estimate total P quickly in high sensitivity, by mixing a sample including P and an oxidizing agent in a thin tube, sending the mixture to a thin reacting tube that is heated to a high temperature and to a catalyst-filled tube that is heated to a high temperature, and making the mixture to react with molybdic acid and a cation dye in a thin mixing tube after decomposition. CONSTITUTION:A specified amount of sample water 3 including P is sent to a mixing joint 9 together with a carrier solution 6 through a 6-way valve 1 and a sample measuring tube 2. The sample is mixed with a solution 8 of an oxidizing agent. The mixture is heated to a high temperature in a reacting tube 10 in a thermostatic oven 11. Then the mixture is further mixed with a coloring liquid 13 including molybdic acid and a cation dye in a tube 15, which is filled with a catalyst such as Pt. Thus coloring is performed. Then absorbance of the mixture from the tube 15 is measured by using a flow cell type photoelectric photometer 16 and the like. Even for environmental samples, whose P component is minute, and for samples including a relatively large amount of organic materials, the content of the total P can be quickly measured highly sensitivity without pretreatment. |
