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 the problem of uneven temperature and affecting water quality determination, etc. problem, achieve the effect of less sample usage, realize automation and laboratory information management, and easy operation

Inactive Publication Date: 2012-02-22
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] The present invention will be further described in detail below in conjunction with the embodiments.

[0013] The present invention is a method for rapidly determining the permanganate index in water by spectrophotometry. The method includes 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 permanganate solution and heated in a 100 degree heating reactor for 15 minutes to 45 minutes. After being taken out and cooled naturally, the remaining permanganate after digestion is reduced with nitrite as a reducing agent and an excess is added. After the reaction, make the volume constant; then take out the 1ml reaction solution after the constant volume and place it in a 25ml colorimetric tube. After the volume is constant again, add p-aminobenzenesulfonamide and ethylenediamine in sequence; in an acidic medium, nitrous acid The salt reacts with p-aminobenzene s...

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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 the quality of water bodies, in particular to a method for indirectly measuring the permanganate index in water, and specifically to a method for rapidly measuring the permanganate index in water by spectrophotometry. Background technique [0002] The permanganate index is a comprehensive indicator of the degree of pollution of surface waters affected by organic pollutants or reductive inorganic pollutants. The permanganate titration method is generally used for detection, that is, sodium oxalate is used as a reducing agent and permanganate is used. The method of titrating excess sodium oxalate for determination is a manual measurement, which is not conducive to quality control; reagents such as sodium oxalate need to be calibrated, which is labor-intensive and time-consuming; it is difficult to derive data for detection by titration at this stage, which is not conducive to large Scale testing. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Patents(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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