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Ultraviolet spectrophotometric method for measuring total nitrogen of water

A spectrophotometry and water determination technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of influence, etc., and achieve the effect of improving processing capacity, increasing electrochemical active area, and enhancing adsorption capacity

Inactive Publication Date: 2018-12-07
郑州市通标环境检测有限公司
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Problems solved by technology

[0004] Aiming at the problem in the prior art that halogen elements such as iodine and bromine can affect the accuracy of the detection of nitrate nitrogen by ultraviolet spectrophotometry, the present invention provides a method for measuring total nitrogen in water by ultraviolet spectrophotometry, the purpose of which is to: During the sample pretreatment process, the halogen ions in the water sample are removed, thereby eliminating the influence of the halogen ions on the accuracy of the detection of nitrate nitrogen by UV spectrophotometry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In Example 1, before the water sample is digested, it is firstly treated to remove halogen ions. The specific treatment process is to put 25ml of water sample in a beaker, and there is a cover made of polytetrafluoroethylene on the top of the beaker. The cover is provided with three holes, and the three holes are used to pass through the gold electrode, reference electrode and counter electrode respectively. The gold electrode is the working electrode, and its shape is a strip-shaped sheet. After the gold electrode is inserted into the water sample and fixed, the total contact area between the gold electrode and the water sample is 2cm 2 . Connect the three electrodes to the potentiostat, and the potentiostat uses Shanghai Chenhua CHI760. Control the potential of the gold electrode to 0.2V, and record the current generated on the gold electrode. After 30 minutes, the collected current value remains basically stable and does not change. At this time, under the premise...

Embodiment 2

[0046] This embodiment is basically the same as Embodiment 1, the difference is that the volume of the water sample for a single treatment is 50ml, and the total area of ​​the gold electrode in contact with the water sample is 4cm 2 , the potential of the gold electrode is controlled to 0.1V, and the resting time of the gold electrode inserted into the water sample is 60min.

[0047] Adopt the method of present embodiment, the standard water sample that the total nitrogen content of preparing is 2.00mg / L (ammonia nitrogen 1.00mg / L, nitrate nitrogen 1.00mg / L) is measured, obtains the measurement result total nitrogen content is 1.95mg / L. The measurement was carried out completely according to the method stipulated in GB11894-89 (that is, the operation of removing halide ions was not performed), and the total nitrogen content of the measurement result was 1.97mg / L.

[0048] Using the method of this embodiment, the prepared total nitrogen content is 2.00mg / L (ammonia nitrogen 1.00...

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Abstract

The invention belongs to the technical filed of spectrophotometric analysis, and specifically relates to an ultraviolet spectrophotometric method for measuring the total nitrogen of water. In the prior art, the accuracy of nitric nitrogen ultraviolet spectrophotometric detection is influenced by halogen elements such as iodine, bromine, and the like, and the provided method can solve the problem mentioned above. The method comprises following steps: (1) digesting a water sample by alkaline potassium persulfate to obtain a digestion solution; and (2) detecting the digestion solution by an ultraviolet spectrophotometric method at wavelengths of 220 nm and 275 nm, and calculating the total nitrogen content of the digestion solution by a standard curve of standard samples. Before the water sample is digested, the water sample is processed by following steps: inserting a precious metal electrode into the water sample, controlling the potential of the precious metal electrode in a range of 0.1 to 0.2 V relative to a standard hydrogen reference electrode; allowing the system to stand still until the current detected by a constant potential rectifier of the precious metal electrode becomesstable; and taking out the precious metal electrode from the water sample, when the potential of the precious metal electrode is controlled. The provided method is used to detect water quality.

Description

technical field [0001] The invention belongs to the technical field of spectrophotometric analysis, in particular to a method for measuring total nitrogen in water by ultraviolet spectrophotometry. Background technique [0002] The principle of UV spectrophotometric determination of total nitrogen in water is to use potassium persulfate to oxidize and digest nitrogen-containing impurities and organic matter in water samples, and oxidize nitrogen to nitrate nitrogen. Then, the absorption of the digestion solution at 220 and 275 nm was detected by ultraviolet spectrophotometry, thereby obtaining the content of nitrate nitrogen in the digestion solution, which is also the content of total nitrogen in the water sample. [0003] However, in this method, the halogen elements such as iodine and bromine in the water sample are oxidized to produce halogen oxygen-containing anions, and these oxygen-containing anions also have absorption in the corresponding wave band, which will affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 苑丽高胜利
Owner 郑州市通标环境检测有限公司
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