Method and apparatus for the determination of phosphorus compounds and nitrogen compounds in water

摘要

Sample water is supplied to an oxidative decomposer, heated to 90. degree. C. under presence of a photooxidation catalyst, and irradiated with ultraviolet radiation by a low pressure mercury lamp while being supplied with air, to cause photooxidative decomposition reaction. After the reaction, nitric acid ions are measured with an absorption photometer at a wavelength of 220 nm. Then, a color developer is added to the sample water, and the colored solution is employed for measurement of phosphoric ions with the absorption photometer at a wavelength of 880 nm.