Method for measuring seawater chemical oxygen demand by photometry

A technology of chemical oxygen demand and photometry, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of cumbersome operation, time-consuming and labor-intensive, etc., and achieve the effect of reducing environmental pollution, simple operation, and fewer varieties

Inactive Publication Date: 2004-03-17
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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Problems solved by technology

It can be seen that this method is cumbersome to operate, time-consuming and labor-intensive, coupled with the strong corrosiveness of the reaction system, etc., and is not suitable for rapid on-site monitoring of seawater COD. It is of great significance to improve the working environment, especially the establishment of my country's coastal pollution / ecological environment monitoring network, to meet the needs of the national digital ocean technology support system, and to maintain the sustainable development of the marine economy.

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  • Method for measuring seawater chemical oxygen demand by photometry
  • Method for measuring seawater chemical oxygen demand by photometry
  • Method for measuring seawater chemical oxygen demand by photometry

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with embodiment.

[0027] figure 1 Shown is the flow chart of photometric method of the present invention to measure seawater COD, at first take seawater sample, pass it through seawater pretreatment device, described seawater pretreatment device is a cylindrical cylinder, and two ends are blocked with screw caps, And there is a water inlet and outlet, and the inside is filled with ion exchange resin or chelating resin. After the seawater passes through the pretreatment device, the metal ions in it are either exchanged by the hydrogen ions in the ion exchange resin, or combined with the chelating resin. A certain group in the reaction forms a chelate, which significantly reduces the concentration of metal ions in the exported seawater. Put the pretreated seawater sample in a 25mL colorimetric tube, add 8mL of 6.25mol / L sodium hydroxide solution, 5.0ml of 0.01mol / L potassium permanganate solution, add ...

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Abstract

The invention discloses a method for measuring seawater chemical oxygen demand by photometry, wherein the seawater exemplar is first pre-processed, then using the basic potassium hypermanganate as reaction system, the potassium permanganate is deacidized quantitatively by organics to produce manganate, using pure water or margin solution as reference ratio, measuring the absorbance an of the manganate at its maximum absorbing wave length 430 nm, drafting the A-COD value operating curve, obtaining the concentration of the organics in the water, i.e. seawater COD value based on the photometric quantity of the operating curve. The method is easy and simple to operate and can reduce the environmental pollution, it is easy to accomplish the automation of the seawater COD measurement.

Description

technical field [0001] The present invention relates to a method for measuring chemical oxygen demand (Chemical Oxygen Demand, sometimes abbreviated as COD hereinafter), in particular to a method for measuring seawater chemical oxygen demand by photometry. Background technique [0002] The chemical oxygen demand of seawater is a comprehensive index to characterize the pollution of seawater by organic matter, and it is a basic environmental ecological element to measure the quality of seawater. At present, the standard determination method of seawater COD in my country is the alkaline potassium permanganate method (GB17378.4-1998). This method is to react the seawater sample with excess potassium permanganate under heating conditions in an alkaline medium. The organic matter in seawater quantitatively reduces potassium permanganate to manganate. Then add sulfuric acid to acidify, then add solid potassium iodide to reduce the remaining potassium permanganate and the generated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 李景印段惠敏张志忠郭玉凤李淑芳王德松宋铭航
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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