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Two-dimensional determination method for ammonia nitrogen content in water body, soil or sediment

A technology of ammonia nitrogen content and determination method, which is applied in the field of environmental chemistry, can solve problems such as the inability to detect ammonia nitrogen in soil and sediment, large quantitative errors, and inability to realize in-situ determination of ammonia nitrogen, and achieve accurate and reliable quantitative analysis results. Low, time-saving effect

Inactive Publication Date: 2020-10-16
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing ammonia nitrogen content determination method requires that after the samples are collected in the laboratory, the water samples are flocculated, precipitated and filtered, and the soil and sediment samples are subjected to a series of processing steps such as freeze-drying, grinding and sieving, extraction and filtration, and color development. It is possible to quantitatively monitor the ammonia nitrogen in the environmental medium, but cannot realize the in situ determination of ammonia nitrogen
In the patents CN201010524008.X and CN201510012427.8, an in-situ determination method of ammonia nitrogen in water body was invented. The technology adopts the method of preparing ammonia nitrogen detection test paper, placing the test paper in the water body to be tested, and comparing the color of the test paper with the standard color card to obtain the water body ammonia nitrogen content; but this method can only be applied to water bodies, and cannot detect ammonia nitrogen in soil and sediments, and the visual method used is highly subjective and has large quantitative errors

Method used

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  • Two-dimensional determination method for ammonia nitrogen content in water body, soil or sediment
  • Two-dimensional determination method for ammonia nitrogen content in water body, soil or sediment
  • Two-dimensional determination method for ammonia nitrogen content in water body, soil or sediment

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Effect test

Embodiment 1

[0032] Step 1. Soak the zeolite in distilled water for 24 hours. After removing the water, soak it in 1 mol / L HCl and 1 mol / L NaOH successively for 24 hours. Rinse the surface acid and alkali with distilled water, air-dry at room temperature, and grind to 300 mesh Sieve; weigh 1.5 g of agarose in 100 mL of distilled water, heat to dissolve, add 20 g of pretreated zeolite, and stir for 10 minutes; inject the mixture while hot into the gap between two glass plates preheated to 85°C , standing at room temperature and cooling to below 30°C to obtain an ammonia nitrogen immobilized film;

[0033] Step 2. Add 1.5 g of agarose into 100 mL of distilled water, heat to dissolve, pour into the gap between two glass plates preheated to 85°C, and let stand at room temperature to cool below 30°C to obtain a diffusion film;

[0034] Step 3, stack ammonia nitrogen fixed membrane, agarose diffusion membrane and PVDF filter membrane with a pore size of 0.45 μm in sequence figure 1 In the circ...

Embodiment 2

[0043] Step 1, the Tulson ® Soak T-42H resin in distilled water for 24 hours, after removing the water, soak it in 1mol / L HCl and 1mol / L NaOH successively for 24 hours, rinse the surface acid and alkali with distilled water, air-dry at room temperature, and grind through a 200-mesh sieve; Weigh 1.5 g of agarose in 100 mL of distilled water, heat to dissolve, add 20 g of pretreated resin, and stir for 10 minutes; inject the mixture while hot into the gap between two glass plates preheated to 85°C, Stand at room temperature and cool to below 30°C to obtain an ammonia nitrogen immobilized film;

[0044] Step 2. Add 1.5 g of agarose into 100 mL of distilled water, heat to dissolve, pour into the gap between two glass plates preheated to 85°C, and let stand at room temperature to cool below 30°C to obtain a diffusion film;

[0045] Step 3. The ammonia nitrogen fixed membrane, the agarose diffusion membrane and the PVDF membrane with a pore size of 0.45 μm are stacked in turn on t...

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Abstract

The invention discloses a two-dimensional determination method for ammonia nitrogen content in a water body, soil or sediment. Ammonia nitrogen in a water body, soil or sediment is extracted by usinga fixed film made of zeolite or ammonia nitrogen obligate adsorption resin, and after the fixed film adsorbing the ammonia nitrogen and a color developing agent develop color, the ammonia nitrogen content is quantitatively analyzed by combining a thin film diffusion gradient (DGT) technology and a computer density imaging (CID) technology. The quantitative analysis result of the ammonia nitrogen content by adopting the DGT technology and the CID technology is more accurate and reliable. The content of ammonia nitrogen in water, soil or sediments can be quickly obtained. According to the method, pretreatment such as flocculent precipitation and filtration does not need to be conducted on the water body sample, or a series of tedious pretreatment steps such as freeze-drying, grinding and sieving and solution extraction are conducted on soil and sediment samples, a large amount of time is saved. The method can be achieved only by additionally arranging a scanner, the requirement for instruments and equipment is low, and application and popularization are facilitated.

Description

Technical field: [0001] The invention relates to the field of environmental chemistry, in particular to a two-dimensional determination method for ammonia nitrogen content in water, soil or sediment. Background technique: [0002] Ammonia nitrogen refers to the free ammonia (NH 3 ) and ammonium ions (NH 4 + ) in the form of nitrogen. When the organic matter in the water body and sediment is mineralized, the inorganic nitrogen produced mainly exists in the form of ammonia nitrogen. Ammonia nitrogen is a nutrient in water bodies and a nitrogen source preferentially used by aquatic plants. After a large amount of ammonia nitrogen enters the water body, due to the high oxygen consumption of ammonia nitrogen, the water quality of the water body will decline; at the same time, algae will use ammonia nitrogen to grow rapidly, which may lead to eutrophication of the water body. In addition, excessive ammonia nitrogen content can also cause toxic effects on fish and some aquatic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/40G06T7/62G06T7/90
CPCG01N21/78G01N1/405G06T7/90G06T7/62G01N2021/775
Inventor 林娟宁栋梁汪岩山刘波姚佳雯魏笑
Owner NANTONG UNIVERSITY
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