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Method for fastly analyzing chemical oxygen demand by high-pressure flowing injection

A technology of flow injection and analytical chemistry, applied in the field of water environment monitoring and analysis, can solve the problems such as the inability to obtain a constant flow of the measured liquid in the flow cell, the interference of colorimetric measurement, and the poor measurement accuracy, so as to curb the generation of bubbles and avoid inconvenience. Adaptation, the effect of a wide measurement range

Inactive Publication Date: 2007-11-21
DELIN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

In recent years, people have done a lot of research on COD flow injection analysis technology, but because COD measurement requires long-term high-temperature digestion, a large number of microbubbles will be generated in the digestion solution and samples in the capillary under normal pressure conditions, which greatly limits the colorimetric determination. interference and cannot achieve
Some people use a bubble remover to remove air bubbles, but because there are too many bubbles, the bubble remover will interfere with the fluid flow state and the light absorption process, so that the flow cell cannot obtain a constant flow of the measured liquid, and the measurement accuracy is very poor

Method used

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  • Method for fastly analyzing chemical oxygen demand by high-pressure flowing injection
  • Method for fastly analyzing chemical oxygen demand by high-pressure flowing injection
  • Method for fastly analyzing chemical oxygen demand by high-pressure flowing injection

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Embodiment Construction

[0023] The principle of the present invention will be explained below in conjunction with Figure 1

[0024] Figure 1 shows the principle flow chart of the method. The pipelines in the figure are all corrosion-resistant fluoroplastic capillary tubes, and a water sample injection valve is connected to the capillary line. Potassium dichromate reagent is continuously delivered by a constant flow pump (pressure ≥ 0.6MPa), flows through the constant temperature heater, cooling water tank, colorimetric flow cell, and returns to the reagent bottle after coming out of the flow cell through a back pressure tube of tens of meters long Inside, a continuous flow of potassium dichromate carrier fluid is formed. During detection, the water sample injection valve is turned to the test position. When the injection valve cuts the water sample into the reaction tube, the sample tape is pushed by the carrier fluid and gradually diffused during the advancement process, and the sample and reagents pres...

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Abstract

A method for quickly analyzing COD by high-pressure flow-injection includes using solution of heavy potassium chromate-diluted sulphuric acid as current-carrying liquid, injecting said current-carrying liquid into pipeline of capillary tube continuously by constant-flow pump, injecting quantitative water sample into current-carrying liquid by injection valve, expanding water sample in current-carrying liquid, flowing water sample in following with current-carrying liquid through reactor and water box as well as colorimetric circulation pool in sequence then utilizing single-color illumination and photoelectric conversion to test out COD.

Description

Technical field [0001] The invention relates to a chemical oxygen demand analysis method for water quality COD detection, in particular to a high-pressure flow injection method for rapid analysis of chemical oxygen demand for on-line monitoring of COD in water, and belongs to the field of water environment monitoring and analysis. Background technique [0002] Chemical Oxygen Demand (Chemical Oxygen Demand) is abbreviated as COD, which means the amount of oxygen consumed by the oxidation of organic matter, nitrite, ferrous salt, sulfide and other reducing pollutants in the water by the oxidizing agent potassium dichromate. The consumption per unit volume of water The oxygen weight is expressed in mg / L. Chemical oxygen demand reflects the degree of water pollution by reducing substances. It is an important indicator for determining the degree of water pollution in the field of environmental protection, and it is also one of the control indicators for total emissions in my country....

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N1/14
Inventor 洪陵成
Owner DELIN ENVIRONMENTAL PROTECTION TECH
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