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Method for shortening time for detecting COD (Chemical Oxygen Demand) in water sample

A water sample and time technology, applied in the direction of chemical analysis by titration method, can solve the problems of long detection time, untimely data feedback, large consumption of medicine, etc., achieve the effect of shortening the detection time and improving the detection efficiency

Pending Publication Date: 2022-03-01
NANJING NANGANG IND DEV CO LTD
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  • Abstract
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Problems solved by technology

The original potassium dichromate method takes a long time to detect, consumes a large amount of medicine, and there will be problems with untimely data feedback

Method used

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  • Method for shortening time for detecting COD (Chemical Oxygen Demand) in water sample

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Embodiment Construction

[0019] In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on the specific embodiments and in conjunction with the accompanying drawings.

[0020] This embodiment provides a method for shortening the detection time of COD in water samples, including steps S101 to S104, and the specific steps are as follows:

[0021] Step S101: Take 5ml of water sample, add 2.5ml of potassium dichromate, 0.1g of mercury sulfate and 7.5ml of silver sulfate to the water sample.

[0022] Step S102: heating and refluxing the water sample, and controlling the reflux time to be 30 minutes. Wherein, the reflux time starts from the boiling of the water sample as the timing starting point, that is, the timing starts when the water sample starts to boil.

[0023] Step S103: Cool the water sample for 22.5 minutes, and then add 20ml of pure water to the water sample.

[0024] Among them, pure water slowly was...

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Abstract

The invention discloses a method for shortening time for detecting COD (Chemical Oxygen Demand) in a water sample, and relates to the technical field of water sample detection methods, and the method comprises the following steps: taking 5ml of a water sample, and adding 2.5 ml of potassium dichromate, 0.1 g of mercury sulfate and 7.5 ml of silver sulfate into the water sample; heating and refluxing the water sample, and controlling the refluxing time to be 30 minutes; the water sample is cooled for 22.5 min, and then 20 ml of pure water is added into the water sample; the method comprises the following steps: adding three drops of a ferroin indicating solution into a water sample, and titrating with an ammonium ferrous sulfate solution with the concentration of 0.0025 mol / L until the color of the solution is changed from yellow to blue-green to red brown. According to the invention, the volume of the water sample is reduced to 5ml, the dosage of the added reagent is diluted on the original basis, and the reflux time is controlled to be shortened, so that the overall detection time is greatly shortened, and the detection efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of water sample detection methods, in particular to a method for shortening the detection time of COD in water samples. Background technique [0002] With the progress of industry and the development of society, water pollution is becoming more and more serious, so the country has strict requirements on the discharge of water quality. COD detection has always been one of the important indicators in industrial water. The faster the detection results are, the better the water quality problems can be reflected in the first place. The original potassium dichromate method takes a long time to detect, consumes a large amount of medicine, and there will be problems with untimely data feedback. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for shortening the time for detecting COD in water sample...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 孙华明
Owner NANJING NANGANG IND DEV CO LTD
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