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

Pending Publication Date: 2021-04-16
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] Aiming at the defects and deficiencies of the existing preparation technology, the object of the present invention is to provide a preparation method of the ammonium nitrogen adsorption bag in natural water and a detection method of the isotope, which solves the enrichment process of the ammonium nitro

Method used

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

Examples

Experimental program
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Example Embodiment

[0023]Example 1

[0024]This example gives a method of preparing a ammonium nitrogen suction package in natural water, including:

[0025]The polytetrafluoride film was taken, and the Seporadion 24 h was added to the mixed gel filter, and the mixed gel filter was dried in a dry box at 100 ° C for 2 h under a nitrogen condition. After the dry mixed gel filter is stored in a vacuum drying case of 20 to 40 ° C to obtain a hydrophobic film; a glass fiber filter having a substantially hydrophobic film is placed on a hydrophobic film. 25 μl of 2 mol / L of sulfuric acid was added to the glass fiber filter, and then the surface of the acidified glass fiber filter was covered from the new hydrophobic film, and the hydrophobic film on both sides was sealed.

[0026]The adsorption package prepared by the present embodiment is a method of detecting an ammonium nitrogen azoa: a natural water sample of 100 mL is added to the culture flask, and the stirrer is added to the culture bottle, and the adsorptio...

Example Embodiment

[0028]Example 2:

[0029]The method of preparing ambient nitrogen suction package in natural water given in this example, the difference from Embodiment 1 is to replace the polytetrafluoroethylene filter in step one as a polypropylene filter, TEOA-PAM -Gel gel concentration of 35%, an amount of sulfuric acid was 30 μL, and the application of the obtained adsorbed package was added to a mass of 300 mg of the Wipple alloy, and the volume of the glass fiber filter was a hydrophobic film. First, the other conditions were the same as in Example 1, and the calculated ammonity nitrogen recovery is 93%, recorded in Table 1, and detects ammonium nitrogen isotope is detected by elemental analyzer - hostelapers. The isotope value is 3.5 ‰ record in Table 1.

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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.

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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Application Information

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IPC IPC(8): G01N27/62G01N31/00B01J20/26B01J20/28B01J20/30
Inventor 胡婧宗雨寒庄志黎焦焦刘卫国
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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