Method for detecting COD content in water by instrument
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A technology for instrument detection and water quality, which is applied in the field of COD content detection, can solve the problems of large reagent consumption, high energy consumption, and large space occupation, and achieve the effects of simple operation, improved detection speed, and improved digestion speed
Inactive Publication Date: 2019-08-02
CHENGYU VANADIUM TITANIUM TECH CO LTD
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[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for detecting the COD content in water quality with an instrument, which has the advantages of small space occupation, less energy consumption, and less reagent consumption, and solves the problem of equipment occupation required by the current COD content detection method. Large space, high energy consumption, large amount of reagents and other defects, so the method of instrument detection of COD content in water quality is proposed to solve the above-mentioned problems
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Embodiment 1
[0022] Embodiment one: the method for COD content in instrument detection water quality, comprises the following steps:
[0023] 1) Test structure, instrument detection of COD content in water quality is based on potassium dichromate as oxidant, silver sulfate as catalyst, mercuric sulfate as a masking agent for chloride ions, and measuring COD digestion system in sulfuric acid acidic conditions;
[0024] 2) Rapid digestion spectrophotometry, which refers to using a sealed tube as a digestion tube, taking a small amount of water samples and reagents in the sealed tube, putting them into a small constant temperature heating dish, heating and digesting at a constant temperature, and measuring the COD value by spectrophotometry, digestion The reaction liquid occupies a suitable space ratio of the sealed tube, and the test instrument selects a special water sample digestion instrument;
[0025] 3) Heating, a part of the sealed tube containing the digestion reaction solution is ins...
Embodiment 2
[0033] Embodiment two: the method for COD content in instrument detection water quality, comprises the following steps:
[0034] 1) Test structure, instrument detection of COD content in water quality is based on potassium dichromate as oxidant, silver sulfate as catalyst, mercuric sulfate as a masking agent for chloride ions, and measuring COD digestion system in sulfuric acid acidic conditions;
[0035] 2) Rapid digestion spectrophotometry, which refers to using a sealed tube as a digestion tube, taking a small amount of water samples and reagents in the sealed tube, putting them into a small constant temperature heating dish, heating and digesting at a constant temperature, and measuring the COD value by spectrophotometry, digestion The reaction liquid occupies a suitable space ratio of the sealed tube, and the test instrument selects a special water sample digestion instrument;
[0036] 3) Heating, a part of the sealed tube containing the digestion reaction solution is ins...
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Abstract
The invention, which relates to the technical field of COD content detection, discloses a method for detecting the COD content in water by an instrument. The method comprises the following steps that:step one, test building is performed; to be specific, an instrument detects the COD content in water by using a measuring method that uses potassium dichromate as an oxidant, silver sulfate as a catalyst, a mercury sulfate as a masking agent for chloride ions and measurement of a COD digestion system as the base under the acidic condition of sulfuric acid; step two, a rapid digestion spectropho-tometry method is performed; to be specific, a sealing tube is used as a digestion tube, a small number of water samples and reagents are placed in the sealing tube, the sealing tube is placed in a small constant-temperature heating container and then constant-temperature heating and digestion are performed, and a COD value is determined by the spectrophotometry method. According to the invention,the method has advantages of small occupied space, low energy consumption, and small reagent amount and the like; defects of large equipment occupied space, high energy consumption, and large reagentdosage of the existing COD content detection method are overcome; and problems are solved by the method for detecting the COD content in water by an instrument.
Description
technical field [0001] The invention relates to the technical field of COD content detection, in particular to a method for instrument detection of COD content in water quality. Background technique [0002] The determination of COD content, also known as "chemical oxygen demand determination", refers to the amount of oxidant consumed in the determination of easily oxidized substances in water under specified conditions, expressed in milligrams of oxygen consumed per liter of water sample. The content of organic matter is an important indicator for evaluating the organic pollution of water bodies. There are two methods: the manganese method and the chromium method. The former uses potassium permanganate as the oxidant, which is relatively simple; the latter uses potassium dichromate as the oxidant, which is suitable for more serious pollution. According to the International Organization for Standardization's water sample analysis, the results determined by the chromium metho...
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