Preparation method of ammonium nitrogen adsorption bag in natural water and isotope detection method thereof

A detection method, ammonium nitrogen technology, applied in the field of materials science, can solve problems such as low work efficiency, cross-contamination, and high requirements for operators, and achieve avoidance of organic nitrogen decomposition and isotope fractionation, high accuracy and precision, and experimental conditionally reliable effect
CN112666245APending Publication Date: 2021-04-16INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
Publication Date
2021-04-16

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Abstract

The invention discloses a preparation method of an ammonium nitrogen adsorption bag in natural water, which comprises the following steps: 1. taking a polymer filter membrane, adding TEOA-PAM-Gel gel, and soaking to obtain a mixed gel filter membrane; 2, introducing inert gas into the mixed gel filter membrane under a closed condition, and drying to obtain a hydrophobic membrane; 3, taking and placing a glass fiber filter membrane on a hydrophobic membrane, wherein the volume of the glass fiber filter membrane is smaller than that of the hydrophobic membrane, an acid solution is dropwise added to the glass fiber filter membrane, the hydrophobic membrane obtained in the step 2 is taken to cover the surface of the glass fiber filter membrane added with the acid solution, and the adsorption bag is obtained. According to the adsorption bag prepared by adopting the method, compared with the prior at by adopting a glass fiber filter membrane, the adsorption bag has the advantages that the adsorbability of ammonia gas is enhanced, the recovery rate of ammonium nitrogen in natural water can reach 96%, the accuracy and precision of an ammonium nitrogen measured value are high, experimental conditions are reliable, and operation is easy.
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Description

technical field

[0001] The invention belongs to the technical field of materials science, and in particular relates to a method for preparing an adsorption bag of ammonium nitrogen in natural water and a method for detecting isotopes thereof. Background technique

[0002] Products of the nitrogen cycle process such as N 2 O, NO 3 - , NO 2 - , NH 3 , NH 4 + etc. are the main pollutants that cause the global greenhouse effect, water eutrophication and acid rain hazards. Ammonium nitrogen is the main form of nitrogen in natural water bodies. The isotope value of ammonium nitrogen can provide a strong theoretical basis for the nitrogen cycle process in natural water bodies and the determination of nitrogen pollution sources, and has played a great role in tracing nitrogen pollution sources. .

[0003] The determination method of ammonium nitrogen isotope value generally includes three steps: ① separation and enrichment of ammonium nitrogen; ② conversion of ammonium salt...

Claims

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