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Method for rapid determination of chemical oxygen demand in environmental water sample

A technology for rapid determination of chemical oxygen demand, applied in the preparation of test samples, measurement of color/spectral characteristics, etc., to achieve the effect of solving chemical oxygen demand and rapid determination

Active Publication Date: 2012-12-12
MINNAN NORMAL UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for quickly measuring chemical oxygen demand in environmental water samples, which can not only solve the problem of the existing photocatalyst oxidation method for measuring chemical oxygen demand in environmental water samples, but also has the advantages of rapid determination, Advantages of simplicity and sensitivity

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  • Method for rapid determination of chemical oxygen demand in environmental water sample
  • Method for rapid determination of chemical oxygen demand in environmental water sample
  • Method for rapid determination of chemical oxygen demand in environmental water sample

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Embodiment Construction

[0026] 1. A new type of catalyst - 5-sulfosalicylic acid surface modified Fe 2 o 3 -GO-TiO 2 preparation of

[0027] (1) Preparation of graphene oxide: Add 2 g to 10 g of graphite powder into a mixture of sodium nitrate (1.5 g to 7.5 g) and 98% concentrated sulfuric acid (150 mL to 750 mL), stir and control the temperature of the water bath to 3°C~5°C; keep stirring and keep the system below 5°C, and slowly add potassium permanganate solution (to prevent explosion); stir at room temperature for 5 days, then add appropriate amount of 30% H 2 o 2 A yellow liquid was obtained from the solution, and the pH value of the obtained yellow liquid was adjusted to 5-6 with 3% sulfuric acid aqueous solution. After ultrasonic treatment for 15 min, the suspension was freeze-dried to obtain graphene oxide (GO).

[0028] (2) Fe 2 o 3 Preparation of -GO composite: take 1-10 g Fe 2 o 3 Nanoparticles were immersed in 1 g / L polyacrylamide hydrochloride solution for 1 hour, filtered and i...

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Abstract

The invention provides a method for rapid determination of chemical oxygen demand (COD) in an environmental water sample. The method comprises the following steps: respectively carrying out photo-catalytic oxidation on a diluent of a to-be-determined water sample and on a COD standard solution under the conditions that the concentration of MnO4<-> is 2 mmol / L, usage amount of a catalyst is 5 g / L, the pH value of a reaction solution is 3.0, reaction temperature is 80 DEG C and illumination time is 30 min, wherein the catalyst is 5-SA_Fe2O3-GO-TiO2 with a modification degree of 90%; subjecting resultant solutions to high speed centrifugation at a rotating speed of 14000 rpm, respectively taking out supernatants and determining absorbance values of the supernatants at a wavelength of 525 nm by using spectrophotometry; and drafting a calibration curve and querying corresponding COD concentration of the diluent of the to-be-determined water sample from the calibration curve based on the absorbance values. The method provided by the invention not only overcomes problems in conventional photo-catalytic oxidation methods for determination of COD in environmental water samples, but also has the advantage of rapid, easy, convenient and sensitive determination.

Description

technical field [0001] The invention relates to water sample processing technology, in particular to a method for quickly measuring chemical oxygen demand in environmental water samples. Background technique [0002] Chemical oxygen demand (COD) is one of the important indicators to evaluate the degree of water pollution. At present, the determination of COD generally adopts the national standard method - potassium dichromate method. The method is accurate, reliable and reproducible, but has some disadvantages, such as low detection sensitivity, long consumption time (2 to 4 hours), complicated and cumbersome operations, a large amount of water and electricity consumption, incomplete oxidation, Use expensive Ag 2 SO 4 , corrosive concentrated H 2 SO 4 And toxic reagents (chromium, mercury), etc. cause secondary pollution. Therefore, in the field of environmental analysis, it is still a challenge to develop a fast, simple, environmentally friendly and accurate COD detec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
Inventor 李顺兴郑凤英蔡舒婕林路秀牟洋
Owner MINNAN NORMAL UNIV
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