CN107525779A - A kind of method of COD contents in quick measure sewage - Google Patents
A kind of method of COD contents in quick measure sewage Download PDFInfo
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- CN107525779A CN107525779A CN201710950466.1A CN201710950466A CN107525779A CN 107525779 A CN107525779 A CN 107525779A CN 201710950466 A CN201710950466 A CN 201710950466A CN 107525779 A CN107525779 A CN 107525779A
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- cod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The invention discloses a kind of method of COD contents in quick measure sewage.The present invention takes sewage sample liquid including (1), and the COD contents of sewage sample liquid are detected using potassium dichromate standard method, sample liquid is concentrated and diluted, concentrate or be diluted to the standard liquid of different COD concentration；(2) standard liquid is added in COD measure pipes, measure reagent is added in COD determines pipe, COD measure pipes are placed under heater and cleared up, then absorbance is detected in spectrophotometer again, using absorbance as ordinate, COD concentration is abscissa, draws out COD standard curves；(3) gather sewage treats sample measuring liquid, it will treat to add in sample measuring liquid in COD measure pipes, and add measure reagent, COD measure pipes are placed under heater and cleared up, then absorbance is detected again, with COD standard curve controls, the absorption values for treating sample measuring liquid are found, and then detect to treat the COD concentration of sample measuring liquid.The present invention has the advantages that detection is quick, and Detection results are accurate.
Description
Technical field
The present invention relates to a kind of detection method of COD contents, and in particular to the side of COD contents in a kind of quick measure sewage
Method.
Background technology
COD COD (Chemical Oxygen Demand) is chemically to measure to need to be oxidized in water sample
Reducing substances amount., can be by the material (one of strong oxidizer oxidation in waste water, wastewater treatment plant effluent and contaminated water
As be organic matter) oxygen equivalent.In river pollution and the operational management of industrial wastewater Quality Research and waste water treatment plant,
It is an Organic Pollution parameter that is important and can comparatively fast determining, is often represented with symbol COD.
Assay method：Dichromate titration, permanganimetric method, AAS, rapid-digestion method, rapid-digestion spectrophotometric
Method meets the measure of national standard HJ-T399-2007 water chemical oxygen demands.
The assay method of existing AAS can not carry out the accurate measurement of COD concentration well, due to water body not
Together, wherein suspension equal size is different, and then influences the light splitting degree of spectrophotometer, and then causes to measure not accurate enough.
The content of the invention
The technical problems to be solved by the invention are：Existing spectrophotometric determination method measurement of the prior art is not accurate enough
Really the problem of, and it is an object of the present invention to provide a kind of quick method for determining COD contents in sewage, can effectively improve detection efficiency, and have
Effect guarantee testing result, effect are more notable.
The present invention is achieved through the following technical solutions：
A kind of method of COD contents in quick measure sewage, including：
(1) sewage sample liquid is taken, the COD contents of sewage sample liquid are detected using potassium dichromate standard method, sample liquid is carried out dense
Contracting or dilution, concentrate or be diluted to the standard liquid of different COD concentration；
(2) standard liquid is added in COD measure pipes, measure reagent is added in COD determines pipe, COD measure pipes are put
Put and cleared up under heater, then detect absorbance in spectrophotometer again, using absorbance as ordinate, COD concentration is
Abscissa, draw out COD standard curves；
(3) gather sewage treats sample measuring liquid, will treat to add in sample measuring liquid in COD measure pipes, adds and survey in COD determines pipe
Determine reagent, COD measure pipes are placed under heater and cleared up, absorbance is then detected in spectrophotometer again, is marked with COD
Directrix curve compares, and finds the absorption values for treating sample measuring liquid, and then detect to treat the COD concentration of sample measuring liquid.
By aforesaid operations, the present invention need to only use existing potassium dichromate standard method to measure a COD concentration, then pass through
The method of concentration can obtain standard curve, and COD quick detection can be realized by this method, improve detection efficiency, also,
Influence of the different quality composition to testing result can effectively be excluded using the method for the present invention, Detection results are more accurate.
Preferably, can be by water sample distilled water diluting to be measured, before recording dilution if absorption values exceed measurement range
Liquid volume and extension rate；The absorbance and standard curve control determined after dilution, suspension content after dilution is found, is multiplied
To be scaled original water sample suspension content after extension rate.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention need to only use existing potassium dichromate standard method to measure a COD concentration, then pass through the method for concentration
Standard curve can be obtained, the quick detection of COD concentration can be realized by this method, improves detection efficiency；
2nd, influence of the different quality composition to testing result can effectively be excluded using the method for the present invention, Detection results are more
Accurately；
3rd, present invention detection is quick, and easy to operate, effect is very notable.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment, the present invention is made
Further to describe in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment
A kind of method of COD contents in quick measure sewage, including：
(1) sewage sample liquid is taken, the COD contents of sewage sample liquid are detected using potassium dichromate standard method, sample liquid is carried out dense
Contracting or dilution, concentrate or be diluted to the standard liquid of different COD concentration；Such as, when the COD concentration of sewage sample liquid is 1000mg/L
When, the heating of 1L sewage sample liquid is condensed into 500mL, now the COD concentration of sewage sample liquid is 2000mg/L；Or take 1L dilutions of sewage
Into 2L, now the COD concentration of sewage sample liquid is 500mg/L.The mark of different COD concentration is obtained according to above-mentioned dilution or method for concentration
Quasi- solution.
(2) standard liquid 2mL is added in COD measure pipes, measure reagent is added in COD determines pipe, measure reagent is
1ml potassium bichromates standard liquid, 3ml1% sulfuric acid-silver sulfate solution, sulfuric acid mercury solution, COD measure pipes are placed on heater
Under in 150 DEG C clear up 40min, absorbance is then detected in spectrophotometer again, using absorbance as ordinate, COD concentration
For abscissa, COD standard curves are drawn out；
(2) gather sewage treats sample measuring liquid, and 2mL is treated into sample measuring liquid is added in COD measure pipes, added in COD determines pipe
Reagent is determined, measure reagent is 1ml potassium bichromates standard liquid, 3ml1% sulfuric acid-silver sulfate solution, sulfuric acid mercury solution, will
COD measure pipes are placed under heater clears up 40min in 150 DEG C, then detects absorbance in spectrophotometer again, with
COD standard curve controls, the absorption values for treating sample measuring liquid are found, and then detect to treat the COD concentration of sample measuring liquid.
If absorption values exceed measurement range, water sample distilled water diluting to be measured can be recorded the liquid before dilution
Volume and extension rate；The absorbance and standard curve control determined after dilution, suspension content after dilution is found, is multiplied by dilution
Original water sample suspension content is scaled after multiple.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (2)
1. a kind of method of COD contents in quick measure sewage, it is characterised in that including：
(1) take sewage sample liquid, the COD contents of sewage sample liquid detected using potassium dichromate standard method, by sample liquid carry out concentration and
Dilution, concentrate or be diluted to the standard liquid of different COD concentration；
(2) standard liquid is added in COD measure pipes, measure reagent is added in COD determines pipe, COD measure pipes are placed on
Cleared up under heater, then detect absorbance in spectrophotometer again, using absorbance as ordinate, COD concentration is horizontal seat
Mark, draws out COD standard curves；
(3) gather sewage treats sample measuring liquid, will treat to add in sample measuring liquid in COD measure pipes, measure examination is added in COD determines pipe
Agent, COD measure pipes are placed under heater and cleared up, then detect absorbance in spectrophotometer again, it is bent with COD standards
Line compares, and finds the absorption values for treating sample measuring liquid, and then detect to treat the COD concentration of sample measuring liquid.
2. the method for COD contents in a kind of quick measure sewage according to claim 1, it is characterised in that if extinction
Number of degrees value exceeds measurement range, water sample distilled water diluting to be measured can be recorded into liquid volume and extension rate before dilution；It is dilute
The absorbance and standard curve control determined after releasing, find suspension content after dilution, be multiplied by after extension rate be scaled it is original
Water sample suspension content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950466.1A CN107525779A (en) | 2017-10-13 | 2017-10-13 | A kind of method of COD contents in quick measure sewage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950466.1A CN107525779A (en) | 2017-10-13 | 2017-10-13 | A kind of method of COD contents in quick measure sewage |
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| CN107525779A true CN107525779A (en) | 2017-12-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082303A (en) * | 2019-06-11 | 2019-08-02 | 成渝钒钛科技有限公司 | The method that instrument detects COD content in water quality |
| CN113218742A (en) * | 2020-01-21 | 2021-08-06 | 株式会社岛津制作所 | Target water body measuring method, water quality monitoring equipment and initial setting method |
| CN114199797A (en) * | 2021-11-12 | 2022-03-18 | 葛洲坝水务温岭有限公司 | Method for rapidly measuring low-range COD |
| CN114199798A (en) * | 2021-11-12 | 2022-03-18 | 葛洲坝水务温岭有限公司 | Method for rapidly measuring high-range COD |
| CN115561207A (en) * | 2022-10-27 | 2023-01-03 | 马鞍山市桓泰环保设备有限公司 | Concentration self-adaptive sewage detection method and system |
| CN114062096B (en) * | 2021-10-09 | 2023-04-21 | 武汉新烽光电股份有限公司 | Water sample dilution method for BOD on-line monitoring |
-
2017
- 2017-10-13 CN CN201710950466.1A patent/CN107525779A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082303A (en) * | 2019-06-11 | 2019-08-02 | 成渝钒钛科技有限公司 | The method that instrument detects COD content in water quality |
| CN113218742A (en) * | 2020-01-21 | 2021-08-06 | 株式会社岛津制作所 | Target water body measuring method, water quality monitoring equipment and initial setting method |
| CN114062096B (en) * | 2021-10-09 | 2023-04-21 | 武汉新烽光电股份有限公司 | Water sample dilution method for BOD on-line monitoring |
| CN114199797A (en) * | 2021-11-12 | 2022-03-18 | 葛洲坝水务温岭有限公司 | Method for rapidly measuring low-range COD |
| CN114199798A (en) * | 2021-11-12 | 2022-03-18 | 葛洲坝水务温岭有限公司 | Method for rapidly measuring high-range COD |
| CN115561207A (en) * | 2022-10-27 | 2023-01-03 | 马鞍山市桓泰环保设备有限公司 | Concentration self-adaptive sewage detection method and system |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171229 |
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| WW01 | Invention patent application withdrawn after publication |