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Total nitrogen includes all nitrogen-containing compounds in the solution, that is, the sum of nitrite nitrogen, nitrate nitrogen, inorganic salt nitrogen, dissolved nitrogen, and the nitrogen in most organic nitrogen-containing compounds. Total nitrogen is a key indicator reflecting water eutrophication. The water pollution incident in Taihu Lake has made regulatory authorities realize anew the hazards of total nitrogen. Understanding the total nitrogen emissions, their distribution, and the main sources is of great significance for controlling water eutrophication and improving water quality. When the nitrite nitrogen level in water is too high, drinking such water causes it to combine with proteins to form nitrosamines, which are strong carcinogens; drinking it over a long period of time is extremely harmful to the body. Moreover, ammonium nitrogen is also converted into nitrite nitrogen under anaerobic conditions ； In drinking water, nitrate nitrogen is reduced to nitrite nitrogen by nitrate-reducing bacteria in the human body, increasing its toxicity to 11 times that of nitrate. This affects the ability of hemoglobin to carry oxygen, leading to suffocation in humans. The total nitrogen analyzer, along with the devices for COD measurement, ammonia nitrogen measurement, total phosphorus measurement, and total nitrogen measurement, were developed in accordance with the documents issued by the **Protection General Administration; thus, the measurement results are accurate and reliable. COD is determined by closed-vessel digestion colorimetry, ammonia nitrogen by Nessler’s reagent colorimetry, total phosphorus by closed-vessel digestion colorimetry, and total nitrogen by closed-vessel digestion ultraviolet photometric absorption method. The instrument is widely applicable in environmental monitoring, sewage treatment, research institutions, and colleges and universities. Rapid tester for COD, ammonia nitrogen, total phosphorus, and nitrogen; high-precision tester for COD, ammonia nitrogen, total phosphorus, and nitrogen.