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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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  • Abstract
  • Description
  • Claims
  • 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 nitrogen in the prior art It is easy to cause cross-contamination, cause measurement errors, and eventually bring errors to the determination of ammonium nitrogen isotope values, and have high requirements for operators. The operation process is time-consuming and laborious, and the overall work efficiency is low.

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

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Embodiment 1

[0024] This embodiment provides a preparation method of an ammonium nitrogen adsorption bag in natural water, including:

[0025] Take the polytetrafluoroethylene filter membrane, add 30% TEOA-PAM-Gel gel and soak for 24 hours to obtain a mixed gel filter membrane, dry the mixed gel filter membrane in a drying oven at 100°C under nitrogen for 2 hours, and dry the mixed gel filter membrane for 2 hours. The dried mixed gel filter membrane is stored in a vacuum drying oven at 20-40°C for 24-48 hours to obtain a hydrophobic membrane; a glass fiber filter membrane whose volume is one-third of the hydrophobic membrane is placed on the hydrophobic membrane, and placed on the hydrophobic membrane. Add 25 μL of 2mol / L sulfuric acid to the glass fiber filter, and then take a new hydrophobic membrane to cover the surface of the acidified glass fiber filter, and seal the hydrophobic membranes on both sides at the edge.

[0026] The method for the detection of ammonium nitrogen isotopes by...

Embodiment 2

[0029] This example provides a method for preparing an ammonium nitrogen adsorption package in natural water. The difference between this example and Example 1 is that the polytetrafluoroethylene filter membrane in step 1 is replaced by a polypropylene filter membrane, TEOA-PAM -The concentration of the Gel gel is 35%, the amount of sulfuric acid added is 30 μL, the quality of adding MgO and Dairyler's alloy to the application of the obtained adsorption package is 300 mg, and the volume of the glass fiber filter membrane is 1 / 4 of the hydrophobic membrane One, other conditions are the same as in Example 1, and the calculated ammonium nitrogen recovery rate ω is 93%, which is recorded in Table 1, and the ammonium nitrogen isotope abundance is detected by an elemental analyzer-isotope mass spectrometer to obtain ammonium nitrogen The isotopic value of 3.5‰ is reported 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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