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Method for rapidly determining total nitrogen content in water by using resorcinol

A technology for rapid determination of resorcinol, which is applied in the preparation of test samples, measurement of color/spectral characteristics, analysis through chemical reactions of materials, etc., which can solve the problems of low test efficiency

Pending Publication Date: 2022-03-25
山东中节能天融环保技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing water quality total nitrogen detection method is the standard method HJ636-2012 alkaline potassium persulfate spectrophotometry, but the test efficiency is not high

Method used

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  • Method for rapidly determining total nitrogen content in water by using resorcinol
  • Method for rapidly determining total nitrogen content in water by using resorcinol
  • Method for rapidly determining total nitrogen content in water by using resorcinol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Use different concentrations of total nitrogen standard solutions to simulate water samples, and operate according to the above-mentioned method for rapidly determining total nitrogen content in water using resorcinol.

[0061] When the sample is digested, take 1ml sample in the colorimetric tube, first add 1ml digestion solution to the colorimetric tube, digest at 110°C for 10 minutes, then add 1ml digestion solution to the colorimetric tube, and digest at 110°C for 10 minutes min;

[0062]Then use a pipette to pipette 1.0ml of the digested solution into a 10ml non-color tube, add 1ml of 0.5% resorcinol and 3ml of concentrated sulfuric acid, shake and mix thoroughly; In a cuvette, measure the absorbance at a wavelength of 365 nm.

[0063] Two sets of tests were carried out, and the experimental data are as follows:

[0064]

Embodiment 2

[0066] The difference between the operation and Example 1 is that when the sample is digested, 2ml of digestion solution is added at one time, and it is digested at 110°C for 20 minutes; other operations are the same as in Example 1.

[0067] Two sets of tests were carried out, and the experimental data are as follows:

[0068]

[0069] By comparing the experimental data of Example 1 and Example 2, it can be seen that the digestion solution is added twice, and the sample is digested twice, and the curve is more linear. This is because the digestion solution is added twice, and the stability of the reaction is better.

Embodiment 3

[0071] The difference between the operation and Example 1 is that when the sample is digested, take 1ml of the sample in the colorimetric tube, first add 1ml of digestion solution to the colorimetric tube, digest it at 110°C for 10 min, and then add it to the colorimetric tube 1ml of digestion solution was digested at 110°C for 5min; then the absorbance of the sample was measured.

[0072] Two sets of experiments were carried out, and the experimental data were recorded as follows:

[0073]

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Abstract

The invention relates to a method for rapidly determining the content of total nitrogen in water by using resorcinol. The method comprises the following steps: step 1, preparing a digestion solution; weighing 10 g of sodium hydroxide solid and 40 g of potassium persulfate solid, dissolving with deionized water, and diluting to 1000 ml; 2, digesting the sample; putting 1ml of the sample into a colorimetric tube; adding 1ml of digestion solution into the colorimetric tube, controlling the digestion temperature at 105-110 DEG C, and digesting for 10 minutes; then taking out the colorimetric tube, adding 1ml of digestion solution into the colorimetric tube, and digesting at 105-110 DEG C for 5-20 minutes; 3, testing the absorbance of the sample; transferring 1.0 ml of the digested sample into a 10ml color distinguishing tube, adding 1ml of a resorcinol solution with the mass fraction of 0.5% and 3ml of concentrated sulfuric acid, and fully mixing the solution; after the sample is cooled to the room temperature, diluting to a 10ml scale line, and measuring the absorbance; and 4, comparing the absorbance of the sample with the standard curve, and checking the total nitrogen content of the sample. The digestion solution is prepared and mixed in advance, so that the digestion reaction rate is increased, the reaction is sufficient, the stability of experimental data is good, and the applicability is high.

Description

technical field [0001] The invention relates to a method for quickly measuring total nitrogen content in water by using resorcinol. Background technique [0002] Total nitrogen refers to the total amount of nitrogenous compounds in water, including organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen; it reflects the degree of water pollution and is an important indicator of water quality. In recent years, due to the development of cities, industries and agriculture, and soil erosion caused by vegetation destruction, a large amount of nutrients such as nitrogen and phosphorus required by organisms have entered lakes and reservoirs, resulting in rapid development of eutrophication in lakes and reservoirs. Therefore, the monitoring of the total nitrogen index is particularly important. [0003] The existing water quality total nitrogen detection methods all adopt the standard method HJ636-2012 alkaline potassium persulfate spectrophotometry, but the test ...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/78G01N1/28G01N1/38
CPCG01N21/33G01N21/78G01N1/28G01N1/38
Inventor 刘测耿庆涛冀润田吕灿戴培勤龚军滕宁宁王金翠田浩刘春龙
Owner 山东中节能天融环保技术有限公司
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