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Method and device for measuring COD (Chemical Oxygen Demand) of high-chlorine water sample

A measuring device and measuring method technology, applied in separation methods, chemical instruments and methods, color/spectral characteristic measurement, etc., can solve the problems of unstable measurement, inaccurate testing of high-chlorinated water samples, easy crystallization, etc., and achieve stable measurement Reliable, the effect of improving the adaptability of the water body

Pending Publication Date: 2021-11-19
深圳市朗石科学仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned technical defects, the present invention provides a method and device for measuring COD of high-chlorinated water samples, which solves the problems of inaccurate testing of high-chlorinated water samples, easy crystallization, and unstable measurement of traditional COD measuring instruments

Method used

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  • Method and device for measuring COD (Chemical Oxygen Demand) of high-chlorine water sample
  • Method and device for measuring COD (Chemical Oxygen Demand) of high-chlorine water sample

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a COD measuring device for high-chlorinated water samples includes a peristaltic pump 1c, a quantitative tube 1a, a multi-row valve 1b, a reaction unit 2, and an absorption device 3 that are sequentially connected by pipelines. The two ends of the quantitative tube 1a are respectively connected to The peristaltic pump communicates with the multi-row valve 1b, the quantitative tube 1a is provided with a liquid level sensor, the reaction unit 2 is a closed reaction chamber, and the top and bottom of the reaction chamber are respectively equipped with an upper sealing valve 8 and a lower sealing valve. The sealing valve 9, the upper sealing valve 8 communicates with the absorption device 3 through a pipeline one 10, the pipeline one 10 is provided with a three-way valve 11, and the lower sealing valve 9 communicates with the multi-row valve through a pipeline two 1b connection, the reaction unit 2 is provided with a constant temperature heating d...

Embodiment 2

[0034] Such as figure 1 with figure 2 As shown in , a COD determination device for high chlorine water samples includes a syringe 1a, a disc valve 1b, a reaction unit 2 and an absorption device 3 connected in sequence, the pneumatic device 1c includes a motor 1ca and a piston 1cb, and the Both the syringe 1a and the motor 1ca are fixedly arranged on the bracket 1cb, the output shaft of the motor 1ca is fixedly connected with a screw rod, and the screw rod is screwed with a slider 1cc, and the slider 1cc is connected with the piston rod of the syringe. Fixedly connected, the liquid outlet of the syringe communicates with the disc valve 1b, the reaction unit 2 is a closed reaction chamber, the top and bottom of the reaction chamber are respectively equipped with an upper sealing valve 8 and a lower sealing valve 9, so The upper sealing valve 8 communicates with the absorption device 3 through a pipeline one 10, the pipeline one 10 is provided with a three-way valve 11, the low...

Embodiment 3

[0036] A water sample measuring method of a COD measuring device for a high-chlorinated water sample is carried out according to the following steps:

[0037] Step 1. The peristaltic pump 1c continues to rotate forward to generate negative pressure. At this time, open a valve in the multi-row valve 1b, so as to pump the water sample to be tested from the connected pipeline to the quantitative tube 1a, and sense the rising of the pumping through the sensor Stop the pump at a specific point to complete the quantification of a specific volume of the solution. Then, the multi-row valve 1b closes all valves, opens the upper sealing valve 8 and the lower sealing valve 9, the peristaltic pump 1c reverses, and the quantitative pipe 1a A positive pressure will be generated, which can push the water sample to be tested in the quantitative tube 1a to the reaction chamber 2;

[0038] Step 2. The peristaltic pump 1c continues to rotate forward to generate negative pressure. At this time, ope...

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Abstract

The invention relates to the field of water quality detection and particularly relates to a COD measuring method and device for a high-chlorine water sample. The device comprises a quantitative sample injection unit, a reaction unit and an absorption device which are sequentially connected through pipelines, wherein a constant-temperature heating device and a photoelectric measuring device are arranged outside the reaction unit, and the quantitative sample injection unit comprises a pneumatic device, a quantifying device and a multi-way valve which are sequentially communicated, the pneumatic device can blow air to the reaction unit through a pipeline, and the pneumatic device, the quantifying device, the multi-way valve, the constant-temperature heating device and the photoelectric measuring device are all electrically connected with the control unit. Compared with the prior art, the method for measuring the COD of the high-chlorine water sample, provided by the invention, can easily and accurately measure the COD of the high-chlorine water sample with the concentration of less than 50000 mg / L, is stable and reliable in measurement, does not cause potential blocking risk to a liquid path, is particularly suitable for the field of online monitoring of the COD of the high-chlorine water sample, improves water body adaptability of an online COD measuring instrument, and adds waste gas recovery so that the situation that toxic hydrogen chloride gas is directly discharged into air to cause atmospheric pollution is avoided.

Description

technical field [0001] The invention relates to the field of water quality detection, in particular to a method and device for measuring COD of high-chlorinated water samples. Background technique [0002] COD (ChemicalOxygenDemand) is a very important parameter in the research of river pollution and industrial wastewater properties and the operation and management of wastewater treatment plants. It refers to the amount of oxidant consumed when a certain oxidant is used to treat water samples under certain conditions. It is used to reflect the degree of water pollution by reducing substances and can be used as a comprehensive indicator of the relative content of organic matter. [0003] The measurement principle of the traditional COD on-line analyzer adopts the potassium dichromate spectrophotometric method, that is, under the control of the set program, the instrument mixes the water sample with potassium dichromate and concentrated sulfuric acid, and adds silver sulfate a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/75G01N21/27B01D53/14
CPCG01N21/75G01N21/27B01D53/1456B01D2257/2045
Inventor 严百平谢金强张伟政
Owner 深圳市朗石科学仪器有限公司
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