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Principles and methods for determining total nitrogen

2024-01-08 13:57

The principle of total nitrogen determination (colorimetric acid method): The alkaline persulfate digestion process converts all forms of nitrogen into nitrate. After digestion, add a masking agent to remove halogenated oxidizing substances. Then nitrate reacts with chromogenic acid in a strongly acidic environment to form a yellow complex. Determine the total nitrogen content in the water sample based on the absorbance of the complex.

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