Method for detecting content of organic nitrogen in water body

The invention discloses a method for detecting the content of organic nitrogen in a water body. The method comprises the following steps: filtering a water sample to be detected; adjusting the pH value of the water sample to be detected, placing a selective nanometer film in a filtering device to filter the water sample to be detected, pouring a fixed amount of ultrapure water into the filteringdevice, and after a high-purity nitrogen gas is injected for preconsolidation, pouring a fixed amount of water sample into the filtering device, measuring the volume of the filtrate, calculating a magnification of a concentrated solution, performing water quality analysis on the concentrated solution to obtain a corresponding concentrated solution measured value; performing calculation according to the magnification of the concentrated solution to obtain the content of the organic nitrogen in the water sample to be detected; obtaining address information of the water sample, sending the address information of the water