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How to Measure Total Nitrogen and Total Phosphorus? Simple Measurement and Official Methods [Basic Knowledge]

Decompose various forms of nitrogen and phosphorus and align them into a single form before measuring. This explains the mechanism of the official method and points to note when using a simplified method.

Total nitrogen refers to the total amount of nitrogen contained in water. It includes inorganic nitrogen from ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen, as well as organic nitrogen found in organic compounds such as proteins. Total phosphorus is also measured as a total amount rather than measuring each type of phosphorus compound individually. ■ How is the "total" amount measured? If the forms are different, they cannot be measured together. Therefore, chemicals are added, and the sample is heated and decomposed to standardize everything into one form before measurement. 1. Total nitrogen: Decomposed with alkaline potassium peroxydisulfate to convert nitrogen compounds into nitrate ions. 2. Total phosphorus: Decomposed with potassium peroxydisulfate, etc., and measured as phosphate ions. In the decomposition of total nitrogen, the sample is heated to about 120°C in an autoclave. ■ Official methods are determined by notification The method of measurement when comparing with wastewater standards is specified by a notification from the Minister of the Environment. Methods for determining nitrogen and phosphorus content are designated by Japanese Industrial Standards (JIS) K0102, among others. Please feel free to consult us first.