Method for quickly detecting hypermanganate index in water by molecular absorption spectrometry

A permanganate index and rapid determination technology, which is applied in the field of indirect determination of water quality permanganate index and rapid determination of permanganate index in water by molecular spectral absorption method, can solve the problems of affecting detection accuracy and relative deviation. , to achieve the effects of less turbidity influence, less reagent volume, safe and environmentally friendly reagent volume

Active Publication Date: 2011-02-16
浙江中通检测科技有限公司
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Problems solved by technology

However, practice has proved that the use of different reducing agents will affect the accuracy of detection, and their relative deviations are different

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  • Method for quickly detecting hypermanganate index in water by molecular absorption spectrometry

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with specific embodiments.

[0013] A method for quickly measuring permanganate index in water by molecular spectral absorption method 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 0.2 umol / L permanganate solution and heated in a heating reactor at 100 degrees for a certain period of time, take it out after natural cooling, digest the remaining permanganate, then use nitrite as a reducing agent to reduce and add excess, reaction 3 After 5 minutes, after constant volume, take out 1ml of the reaction solution after constant volume and place it in a 25ml colorimetric tube. The nitrite is instantly converted into nitrogen dioxide, and the gas phase molecules are loaded into the absorption light tube with the carrier gas, and the absorbanc...

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Abstract

The invention discloses a method for quickly detecting hypermanganate index in water by molecular absorption spectrometry. The method comprises the following steps: selecting a color comparison tube to extract a water sample, adding proper sulfuric acid to ensure the water sample is of acidity; adding 0.01 to 0.2umol/L of hypermanganate solution, and heating for 30 minutes in a heat reactor at 100 DEG C; cooling, reducing the residual hypermanganate with nitrite, and adding excessive nitrite to react 3 to 5 minutes; putting 1ml of the reaction solution after constant volume in a 25ml color comparison tube; adding citric acid-ethanol solution, and converting the nitrite into nitrogen dioxide instantly; and carrying gas-phase molecules to an absorption tube by carrier gas, and detecting the light absorption value at the position of 213.9 nano-wavelength. The invention establishes a quick quantitative analysis method for the hypermanganate index in the water by an indirect nitrite detection mode, has the characteristics of quick detection, high accuracy, less turbidity influence, little reagent and safety and environmental protection, and can be widely applied to emergency, online detection, flowing injection, lab information 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 the permanganate index of water quality, specifically a method for quickly measuring the permanganate index in water by molecular spectral absorption method. Background technique [0002] The permanganate index is a comprehensive indicator of the pollution degree of surface water bodies by organic pollutants or reducing inorganic pollutants. , expressed in mg / l of oxygen. Generally, the water sample is oxidized by permanganate and then reduced with sodium oxalate, and then the excess sodium oxalate is titrated with permanganate. Manganate index, using this method not only needs to prepare sodium oxalate standard solution, but also requires two people to parallelize it when calibrating, which is labor-intensive and time-consuming. When titrating the permanganate treatment solution, it needs to be paralleled twice, which is very troublesome a...

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Application Information

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IPC IPC(8): G01N21/31
Inventor 赵建平
Owner 浙江中通检测科技有限公司
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