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Device and method for detecting COD of seawater

A measuring device and seawater technology, applied in the direction of measuring device, chemical analysis by titration method, preparation of test samples, etc., can solve the problems of large detection error, cumbersome, large difference, etc., and achieve the degree of automation and automation of temperature control High, simple structure effect

Pending Publication Date: 2017-08-04
青岛卓建海洋装备科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned COD detector still has certain defects: there are many kinds of reactors and mixers in the analysis and detection flow path, the operation steps are many and cumbersome, and the flow path is complicated; in addition, the principle of the optical detection device used for detection is spectroscopic Photometric method, when this method is applied to seawater with high turbidity, the detection error is large
However, the oxidation temperature of potassium permanganate under alkaline conditions cannot meet the national standard requirements of the alkaline potassium permanganate oxidation method (GB17378.4-2007); It can be applied in lower seawater. In the case of high turbidity, the difference between the measurement result of the photometric value and the actual measurement value is large.

Method used

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  • Device and method for detecting COD of seawater
  • Device and method for detecting COD of seawater
  • Device and method for detecting COD of seawater

Examples

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Embodiment 1

[0037] Such as figure 1 As shown, a seawater COD measuring device of the present invention includes a sampling unit 100, a digestion unit 200, a condensation unit 300 and a titration unit 400, and the sampling unit 100 is connected to the digestion unit 200 and the titration unit 400 respectively through pipelines. connected to transport water samples and reagents, the digestion unit 200 is connected to the condensation unit 300 through pipelines, used to mix the water samples and reagents, and heat and digest the mixed water samples, the condensation unit 300 Connected with the titration unit 400 through a pipeline, it is used to cool the mixed water sample after heating and digestion. The titration unit 400 is used to determine the titration of the cooled mixed water sample, and also includes a color judging device. The device includes a surface light source and a color sensor arranged on both sides of the titration tank of the titration unit. The light emitted by the surfac...

Embodiment 2

[0055] A method for measuring seawater COD, comprising the steps of:

[0056] (1) Sample preparation, mixing water sample, sodium hydroxide solution and potassium permanganate solution to prepare a measurement solution;

[0057] (2) Digestion, stirring and heating the measurement solution;

[0058] (3) Condensation, cooling the digested measurement solution to room temperature;

[0059] (4) Titration, mix the measurement solution after digestion and condensation, sulfuric acid and potassium iodide solution, stir and let it stand, and make a preliminary solution; mix the preliminary solution and starch solution to make a solution to be titrated; slowly mix the sodium thiosulfate solution Titrate into the solution to be titrated until the blue color has just faded. When the color sensor reads the color as white, it is judged that the blue color has just faded and the titration is over;

[0060] Before judging whether the blue has just faded, also include:

[0061] Blank calib...

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Abstract

The invention provides a device and method for detecting COD of seawater. The device comprises a feeding unit, a digesting unit, a condensing unit, a titration unit and a color determination device, wherein the color determination device comprises an area source and a color sensor which are arranged on two sides of a titration tank of the titration unit; and light emitted from the area source is received by the color sensor through liquid in the container, the color sensor determines that blue is just faded when reading the color to be white, and titration is completed. The detection method comprises the steps of preparing a sample, digesting, condensing, tittering, and correcting blank. The device and method have the beneficial effects of high heat efficiency and high condensing speed, and can be used for correctly determining the color of seawater having relatively high turbidity by means of blank correcting.

Description

technical field [0001] The invention relates to the field of seawater quality detection, in particular to a seawater COD measuring device and method. Background technique [0002] COD, the English full name Chemical Oxygen Demand, is the chemical oxygen demand, which is a chemical method to measure the amount of reducing substances that need to be oxidized in the water sample, expressed in mg / L of oxygen, and is usually used to measure the relative organic matter in the water body Content is the measurement of the concentration of organic matter and inorganic oxides in water, reflecting the degree of water body pollution by reducing substances, is an important indicator of water quality evaluation, and is one of the routine monitoring items of seawater. [0003] In view of the characteristics of seawater quality, my country adopts the alkaline potassium permanganate method (GB17378.4-2007) as the national standard method for the determination of chemical oxygen demand in sea...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N31/16G01N1/44G01N1/42G01N1/38G01N21/01
CPCG01N1/38G01N1/42G01N1/44G01N21/01G01N21/78G01N31/16G01N2201/061G01N2001/386G01N2021/0112
Inventor 冷俊昭崔建祥杨华彭艳刘崇锋
Owner 青岛卓建海洋装备科技有限公司
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