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Rapid Analysis Method of Total Nitrogen in Watershed

A rapid analysis and watershed technology, applied in the measurement of color/spectral characteristics, preparation of test samples, etc., can solve the problems of inconvenient analysis, cumbersome pretreatment, contamination of reagents and tools, etc., and achieve the effect of improving detection accuracy

Active Publication Date: 2018-01-30
青岛国茂环境检测有限公司
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Problems solved by technology

[0003] At present, the determination of total nitrogen in water quality mostly adopts "potassium persulfate oxidation ultraviolet spectrophotometry" (GB11894-1989). The pretreatment of this method is relatively cumbersome, the labor time is long, and the reagents and tools used for determination also have certain pollution. Inconvenience for analysis work

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  • Rapid Analysis Method of Total Nitrogen in Watershed

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Embodiment Construction

[0023] Rapid analysis methods for total nitrogen in watersheds such as figure 1 shown, including:

[0024] (1) Collect 20ml of samples from the watershed to be tested;

[0025] (2) The sample is divided into two parts, each part of 10ml, and potassium hydroxide with different concentrations of 1.06mol / L and 0.66mol / L are added respectively; in other embodiments, the concentration of the potassium hydroxide solution is respectively 1.02- 1.2mol / L and 0.6-0.8mol / L.

[0026] (3) Stir the two samples evenly;

[0027] (4) Filter the sample to remove impurities such as grass blades in the sample;

[0028] (5) Carry out repeated recrystallization to potassium persulfate;

[0029] The recrystallization process is: add about 800ml of ultrapure water to a 1L beaker, heat it in a water bath at 2 standard atmospheric pressure and 50°C, then gradually add potassium persulfate, and stir while adding until the potassium persulfate is no longer Dissolve, and then use a clean glass sand f...

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Abstract

In order to improve the analysis speed of total nitrogen, the present invention provides a rapid analysis method for total nitrogen in a watershed, comprising the following steps: collecting a sample from the watershed to be tested; dividing the sample into two parts, adding potassium hydroxide solutions of different concentrations respectively; The sample is filtered; Potassium persulfate is recrystallized multiple times, and then the potassium persulfate is added in equal amounts to the two samples; two samples are put into the COD digestion apparatus for heating; after a certain period of time, Take out two samples in a water bath and cool to room temperature, then add hydrochloric acid to the two samples respectively; stir the two samples evenly; use a UV spectrophotometer to measure the absorbance, and use the average value of the absorbance of the two samples as the reference absorbance of the sample; draw the standard The curve is compared with the reference absorbance to obtain the total nitrogen content of the water body in the watershed to be tested. The invention improves the analysis speed and precision of total nitrogen.

Description

technical field [0001] The invention belongs to the technical field of water quality analysis, and more specifically relates to a rapid analysis method for total nitrogen in a watershed. Background technique [0002] Many research data show that the content of total nitrogen and total phosphorus is positively correlated with the degree of eutrophication of lakes. Therefore, in order to effectively prevent and control eutrophication of water bodies, it is very necessary to measure total nitrogen and total phosphorus in the bottom sediments of rivers, lakes, rivers, reservoirs, seas and other water bodies. Total nitrogen is the general term for nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and organic nitrogen. The total nitrogen content in water is one of the important indicators to measure water quality and the main indicator to reflect the eutrophication of water body. Its determination is helpful to evaluate the pollution and self-purification status of water bodie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33G01N1/44
Inventor 杨浩张戈李建黄磊
Owner 青岛国茂环境检测有限公司