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Method for rapidly measuring permanganate indexes in water by spectrophotometric method

A technology of permanganate index and spectrophotometry, which is applied in the field of indirect determination of permanganate index in water and rapid determination of permanganate index in water by spectrophotometry, which can solve problems affecting water quality determination and uneven heating temperature , to achieve automation and laboratory information management, less sample usage, and easy operation

Inactive Publication Date: 2011-04-13
宁波市环境监测中心
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Problems solved by technology

However, practice has proved that in the process of permanganate digestion, uneven temperature, excessive permanganate, etc., may cause oxidation and reduction of permanganate and manganese ions, and precipitate manganese dioxide particles, which will affect the water quality. Determination of

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Embodiment Construction

[0012] Below in conjunction with embodiment the present invention is described in further detail.

[0013] A method for quickly measuring permanganate index in water by spectrophotometry of the present invention, the method comprises firstly selecting a colorimetric tube to extract a water sample, adding an appropriate amount of sulfuric acid to make it acidic, and then adding 0.01umol / L to 0.2umol / L of permanganate solution and heated in a heating reactor at 100 degrees for 15 minutes to 45 minutes, take it out and cool it naturally, digest the remaining permanganate, then use nitrite as a reducing agent to reduce and add excess, After the reaction, constant volume; then take out the 1ml reaction solution after constant volume and place it in a 25ml colorimetric tube, after constant volume again, add p-aminobenzenesulfonamide and ethylenediamine successively; in acidic medium, nitrous acid The salt reacts with p-aminobenzenesulfonamide to generate a diazonium salt, and then ...

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Abstract

The invention relates to a method for rapidly measuring permanganate indexes in water by a spectrophotometric method. The method comprises the following steps: selecting a colorimeter tube and extracting a water sample; adding a proper amount of sulfuric acid until the water sample is acidic; adding 0.01mu mol / L-0.2mu mol / L of permanganate solution and heating the obtained mixed solution in a heating reactor at 100 DEG C for 15-45 minutes; after the mixed solution is cooled, reducing the remaining permanganate with excessive nitrite, and then adjusting the obtained reaction solution into a constant volume after the reaction; taking out and placing 1ml of the reaction solution with a constant volume in the colorimeter tube of 25ml, adjusting the reaction solution into a constant volume once again, and sequentially adding 0.5ml of sulfanilamide and 0.5ml of ethylenediamine; and standing for 10 minutes, and taking water as a reference and measuring the absorbancy by a cuvette with the optical path length of 10mm at the position with the wavelength of 10mm. In the invention, a rapid quantitative analysis method of the permanganate indexes in the water is established by the mode of indirectly measuring the nitrite; the method is rapid and economical, and the process of titrating sodium oxalate with the permanganate can be avoided; and the method can be widely applied to emergency, online monitoring, flow injection, lab informatization management and the like.

Description

technical field [0001] The invention relates to a method for detecting water quality, in particular to an indirect method for measuring permanganate index in water, specifically a method for quickly measuring permanganate index in water by spectrophotometry. Background technique [0002] The permanganate index is a comprehensive indicator of the pollution degree of the surface water body by organic pollutants or reducing inorganic pollutants. Generally, the permanganate titration method is used for detection, that is, sodium oxalate is used as the reducing agent, and then permanganate The method of titrating excess sodium oxalate is used for determination, which is a manual determination, which is not conducive to quality control; it is necessary to calibrate reagents such as sodium oxalate, which is labor-intensive and time-consuming; it is difficult to export data at this stage for detection by titration, which is not conducive to large-scale scale detection. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
Inventor 赵建平
Owner 宁波市环境监测中心
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