Method for determining total nitrogen content based on ion chromatography technology

Abstract

The invention belongs to the field of analysis and detection, and particularly relates to a method for determining total nitrogen content based on an ion chromatography technology. The technical problem to be solved by the invention is to provide a method for determining the total nitrogen content based on an ion chromatography technology, which comprises the following steps: A, oxidizing and digesting a system to be detected by using alkaline potassium persulfate to obtain a sample to be detected, directly detecting the sample to be detected by using ion chromatography without adding acid forneutralization to obtain a peak area corresponding to nitrate radicals in the sample to be detected; wherein the leacheate of the ion chromatography is a system containing hydroxide radicals; B, replacing the system to be detected with isopyknic water, and obtaining the peak area corresponding to nitrate radicals in the blank group, wherein the rest contents are the same as those in the step A; and C, calculating to obtain the total nitrogen content of the system to be detected according to the standard curve and the data in the steps A and B. The method is suitable for detection of various nitrogen-containing substances, and has the advantages of few pretreatment steps, simple operation, good precision, good recovery rate, high accuracy and the like.

Description

technical field [0001] The invention belongs to the field of analysis and detection, in particular to a method for measuring total nitrogen content based on ion chromatography technology. Background technique [0002] At present, domestic standards, such as "HJ 636-2012 Determination of Total Nitrogen in Water Quality", mainly use alkaline potassium persulfate to oxidize and digest nitrogen-containing compounds in the mixed system to form nitrate, and then measure nitrate by ultraviolet spectrophotometry. content, and then obtain the total nitrogen content of the system. Although this method is easy to operate, it has strict requirements on the quality of the reagents (especially the nitrogen content), and after digestion, interference is likely to affect the accurate determination of the absorbance of the solution, which leads to relatively large errors in the test data. Big. [0003] In the prior art, there are also methods for measuring the total nitrogen content in wate...

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Problems solved by technology

[0002] At present, domestic standards, such as "HJ 636-2012 Determination of Total Nitrogen in Water Quality", mainly use alkaline potassium persulfate to oxidize and digest nitrogen-containing compounds in the mixed system to form nitrate, and then measure nitrate by ultraviolet spectrophotometry. content, and then obtain the total nitrogen content of the system. Although this method is easy to operate, it has strict requirements on the quality of the reagents (especially the nitrogen content), and after digestion, interference is likely to affect the accurate determination of the absorbance of the solution, which leads to relatively large errors in the test data. Big

[0003] In the prior ar

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