CN114018905A - Kit for rapidly detecting water quality COD (chemical oxygen demand), preparation method and use method thereof - Google Patents
Kit for rapidly detecting water quality COD (chemical oxygen demand), preparation method and use method thereof Download PDFInfo
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- CN114018905A CN114018905A CN202111144107.XA CN202111144107A CN114018905A CN 114018905 A CN114018905 A CN 114018905A CN 202111144107 A CN202111144107 A CN 202111144107A CN 114018905 A CN114018905 A CN 114018905A
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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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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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
- G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
- G01N21/293—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection with colour charts, graduated scales or turrets
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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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/775—Indicator and selective membrane
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Abstract
The invention provides a kit for rapidly detecting water quality COD, which comprises a COD detection reagent and is characterized in that the COD detection reagent comprises the following components in percentage by mass: 1.5-30.0% of potassium permanganate; 80.0-98.0% of strong alkaline reagent and 0.1-2.0% of anti-caking agent. The invention also discloses a preparation method and a using method of the kit. The kit disclosed by the invention does not need an additional instrument, does not need time-consuming waiting, does not need to contact with a chemical reagent, does not need to be operated by a professional person, and can realize the rapid detection of the COD kit in the environment such as a field and the like at any time and any place. The detection reagent is independently packaged powder reagent, and is convenient to carry and use.
Description
Technical Field
The invention belongs to the technical field of water quality COD detection, and particularly relates to a kit for rapidly detecting water quality COD, and a preparation method and a use method thereof.
Background
With the increasing population and the rapid development of economy, the pollution of water resources is becoming serious day by day, and the Chemical Oxygen Demand (COD) is one of the important indexes for measuring the pollution degree of water quality. The COD limit value is regulated in the standards of GB 3838 + 2002 surface water environmental quality standard, GB 3097 + 1997 seawater quality national standard, GB 18918 + 2002 urban sewage treatment plant pollutant emission standard, GB 8978 + 1996 sewage comprehensive emission standard, GB 8978 + 1996 medical institution pollutant emission standard and the like.
The COD in the national standard can be determined by a potassium dichromate method, an acid potassium permanganate method and an alkaline potassium permanganate method. The accurate detection result can be obtained by adopting a national standard method, but the method has the following defects of needing specific equipment, complicated operation, high professional requirement, difficult emergency and the like. In order to make up for the short plate of the detection, a rapid, accurate, portable, simple and rapid COD detection kit is developed in recent years.
The existing COD detection kit is based on two reaction principles of a potassium dichromate method and an alkaline potassium permanganate method. The COD detection kit by the potassium dichromate method comprises a liquid test solution and a powder reagent bag, wherein the liquid test solution comprises: sulfuric acid, silver sulfate, potassium dichromate; powder reagent bag: mercury sulfate powder; and (4) after a matched digestion device is still needed to digest during testing, testing. The disadvantages of the kit are as follows: a matched digester is required, the field operation is not applicable, and toxic mercury sulfate is used as a reagent, so that the environment is not protected. The COD detection kit by the alkaline potassium permanganate method comprises an alkaline detection solution and a potassium permanganate detection solution. The disadvantages of the kit are as follows: the potassium permanganate solution has short storage period, and the liquid reagent is inconvenient to carry.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a kit for rapidly detecting water quality COD, a preparation method and a use method thereof. The kit is convenient to use, simple to operate, high in detection accuracy and suitable for various occasions.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides a kit for rapidly detecting COD (chemical oxygen demand) of water quality, which comprises a COD detection reagent, wherein the COD detection reagent comprises the following components in percentage by mass: 1.5-30.0% of potassium permanganate; 80.0-98.0% of strong alkaline reagent and 0.1-2.0% of anti-caking agent.
Preferably, the strong alkaline reagent is selected from one or a mixture of two of potassium hydroxide, sodium carbonate and sodium bicarbonate.
Preferably, the anti-caking agent comprises silica, diatomaceous earth, bentonite.
Preferably, the kit further comprises a standard colorimetric card and a colorimetric device, and the detection range of the standard colorimetric card is provided with 6-8 color scales.
Preferably, the colorimetric instrument comprises a glass bottle, a transparent plastic bottle, a plastic tube; the volume of the colorimetric device is 2-20 mL.
The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme.
The invention also provides a method for preparing the kit for rapidly detecting the COD in the water quality, which comprises the following steps:
pretreatment of a reagent: grinding an analytically pure reagent potassium permanganate, screening by a 200-mesh sample separation sieve, and collecting undersize products for later use;
mixing the ingredients: respectively weighing potassium permanganate, a strong alkaline reagent and an anticaking agent according to the proportion, and fully and uniformly mixing in a mixer;
subpackaging: each individual package is filled with a specified mass of the mixed reagents;
assembling: and (3) packaging the detection reagent, the colorimetric tool, the standard colorimetric card, the instruction and the like into an external packaging box to obtain the kit for rapidly detecting the water quality COD.
The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme.
The invention also provides a method for detecting the water quality COD by using the kit for quickly detecting the water quality COD, which comprises the following steps:
taking a water sample with a specified volume into a colorimetric device, adding 1 independently packaged detection reagent, shaking for dissolution, standing for reaction for a plurality of minutes, comparing with a standard colorimetric card, and reading a numerical value.
Preferably, the COD detection range of the kit is 5-1000 mg/L.
Preferably, the kit is used for detecting the COD concentration in surface water, sewage and seawater.
The invention has the beneficial effects that the invention provides the COD kit based on the principle of the alkaline potassium permanganate method, namely, potassium permanganate oxidizes reducing substances in water under the strong alkaline condition, the valence state of a potassium permanganate reduction product changes along with the content of the reducing substances, the content of the reducing substances in the water is determined by visual colorimetry by utilizing the color change of manganese with different valence states, and the prepared water quality COD detection kit can realize the rapid detection of water quality COD in the environment such as a field and the like at any time and any place without instruments, time-consuming waiting, chemical reagent contact and professional operation. The detection reagent is an independently packaged powder reagent, and is convenient to carry and use. The kit of the invention has slightly different standing reaction time along with the temperature change of a water sample: water temperature 10 deg.c for 6 min; water temperature 20 deg.c for 5 min; the water temperature was 30 ℃ for 4 minutes. The kit has high detection speed and high accuracy, and is suitable for various occasions.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 preparation of COD detection kit
1. Preparing a COD detection reagent:
pretreatment: the analytical reagent potassium permanganate is ground, screened by a 200-mesh sample separation sieve, and the undersize product is collected for later use.
Mixing the ingredients: 2.5g of potassium permanganate, 96.5g of sodium hydroxide and 1g of silicon dioxide are respectively weighed and put into a mixer to be fully and uniformly mixed.
Subpackaging: each individual package was filled with 0.05 grams of the above mixed reagents.
2. Preparing a standard colorimetric card:
detection range: COD concentrations were 0, 5, 10, 13, 20, 50, 100 mg/L.
The method comprises the following steps: the COD concentrations of the glucose prepared series are respectively: 0mg/L, 5mg/L, 10mg/L, 13mg/L, 20mg/L, 50mg/L, 100mg/L of the standard solution, respectively, was tested using the above-prepared detection reagent.
The test method comprises the following steps: respectively putting 10mL of the standard solution into a 15mL glass colorimetric bottle, putting the glass colorimetric bottle into a water bath kettle at 20 ℃ for 10 minutes, adding 0.05g of a pre-loaded reagent, shaking and dissolving, and then putting the glass colorimetric bottle into the water bath kettle at 20 ℃ for reaction for 5 minutes. The color of the standard color chart was determined from the color of each solution. The results are shown in Table 1.
TABLE 1 test results of standard color comparison card
| COD,mg/L | 0 | 5 | 10 | 13 | 20 | 50 | ≥100 |
| Colour(s) | Purple color | Bluish violet | Grayish purple | Grayish green | Green colour | Yellow green | Yellow colour |
3. Assembling a kit:
and (3) packaging the detection reagent, the colorimetric tool, the standard colorimetric card, the instruction and the like into an external packaging box to obtain the kit for rapidly detecting the water quality COD.
Example 2 Water quality COD detection
The test water sample is the effluent of a secondary sedimentation tank of a sewage treatment plant, and the water temperature is about 20 ℃. Using the kit prepared in example 1, 10mL of water was put into a 15mL glass colorimetric bottle, and an independently packaged reagent was added, dissolved by shaking, allowed to stand for 5min, and compared with a standard colorimetric card, and the value was read.
The test results of the kit are compared with the test results of a potassium dichromate method for determining chemical oxygen demand of HJ828 water, and are shown in Table 2.
TABLE 2 test results
As can be seen from the results in Table 2, the kit of the present invention has the advantages of high detection speed, simple operation and high detection accuracy.
The kit of the invention is applicable to the COD detection range: 5-1000 mg/L. The application range of the kit of the invention is as follows: and (3) detecting COD in water bodies such as surface water, sewage, seawater and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. The kit for rapidly detecting the COD in the water comprises a COD detection reagent and is characterized in that the COD detection reagent comprises the following components in percentage by mass: 1.5-30.0% of potassium permanganate; 80.0-98.0% of strong alkaline reagent and 0.1-2.0% of anti-caking agent.
2. The kit for rapidly detecting COD in water according to claim 1, wherein the strongly basic reagent is one or a mixture of two of potassium hydroxide, sodium carbonate and sodium bicarbonate.
3. The kit for rapidly detecting COD in water according to claim 1, wherein the anticaking agent comprises silica, diatomite and bentonite.
4. The kit for rapidly detecting COD in water according to claim 1, wherein the kit further comprises a standard color chart and a colorimetric device, and the detection range of the standard color chart is set to 6-8 color levels.
5. The kit for rapidly detecting COD in water according to claim 4, wherein the colorimetric device comprises a glass bottle, a transparent plastic bottle, a plastic tube; the volume of the colorimetric device is 2-20 mL.
6. A method for preparing the kit for rapidly detecting the COD in the water quality according to any one of claims 1 to 5, which is characterized by comprising the following steps:
pretreatment of a reagent: grinding an analytically pure reagent potassium permanganate, screening by a 200-mesh sample separation sieve, and collecting undersize products for later use;
mixing the ingredients: weighing potassium permanganate, a strong alkaline reagent and an anticaking agent according to the proportion respectively, and putting the mixture into a mixer to be fully and uniformly mixed;
subpackaging: each individual package is filled with a specified mass of the mixed reagents;
assembling: and (3) packaging the detection reagent, the colorimetric tool, the standard colorimetric card, the instruction and the like into an external packaging box to obtain the kit for rapidly detecting the water quality COD.
7. A method for rapidly detecting COD in water by using the kit for rapidly detecting COD in water according to any one of claims 1 to 5, which is characterized by comprising the following steps:
taking a water sample with a specified volume into a colorimetric device, adding 1 independently packaged detection reagent, shaking for dissolution, standing for reaction for a plurality of minutes, comparing with a standard colorimetric card, and reading a numerical value.
8. The method according to claim 7, wherein the COD detection range of the kit is 5-1000 mg/L.
9. The method according to claim 7, wherein the kit is used for detecting COD concentration in surface water, sewage water or seawater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111144107.XA CN114018905A (en) | 2021-09-28 | 2021-09-28 | Kit for rapidly detecting water quality COD (chemical oxygen demand), preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111144107.XA CN114018905A (en) | 2021-09-28 | 2021-09-28 | Kit for rapidly detecting water quality COD (chemical oxygen demand), preparation method and use method thereof |
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| Publication Number | Publication Date |
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| CN114018905A true CN114018905A (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111144107.XA Pending CN114018905A (en) | 2021-09-28 | 2021-09-28 | Kit for rapidly detecting water quality COD (chemical oxygen demand), preparation method and use method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03144348A (en) * | 1989-10-30 | 1991-06-19 | Shikoku Chem Corp | Measuring method and reagent for chemical oxygen demand |
| EP0536059A2 (en) * | 1991-09-30 | 1993-04-07 | Eastman Kodak Company | Test kit and method for the determination of metal ion concentration in solution |
| JPH08145944A (en) * | 1994-11-18 | 1996-06-07 | Nakano Vinegar Co Ltd | Electrical analyzing method for cod and cod measuring device |
| US20060014872A1 (en) * | 2004-07-16 | 2006-01-19 | Martin Roy W | Protective composition that allows in-situ generation of permeation channels therein |
| JP2007333689A (en) * | 2006-06-19 | 2007-12-27 | Hiroshi Yokozawa | Simple measurement kit |
| CN103278501A (en) * | 2013-06-26 | 2013-09-04 | 北京桑普生物化学技术有限公司 | COD quick detection solution, test box and determination method |
| CN103926239A (en) * | 2013-01-11 | 2014-07-16 | 丹纳赫（上海）工业仪器技术研发有限公司 | Detection method for oxidable contaminant in aqueous sample |
| CN109085049A (en) * | 2018-11-05 | 2018-12-25 | 中国石油化工股份有限公司 | COD detection method in a kind of sewage and recycled water |
-
2021
- 2021-09-28 CN CN202111144107.XA patent/CN114018905A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03144348A (en) * | 1989-10-30 | 1991-06-19 | Shikoku Chem Corp | Measuring method and reagent for chemical oxygen demand |
| EP0536059A2 (en) * | 1991-09-30 | 1993-04-07 | Eastman Kodak Company | Test kit and method for the determination of metal ion concentration in solution |
| JPH08145944A (en) * | 1994-11-18 | 1996-06-07 | Nakano Vinegar Co Ltd | Electrical analyzing method for cod and cod measuring device |
| US20060014872A1 (en) * | 2004-07-16 | 2006-01-19 | Martin Roy W | Protective composition that allows in-situ generation of permeation channels therein |
| JP2007333689A (en) * | 2006-06-19 | 2007-12-27 | Hiroshi Yokozawa | Simple measurement kit |
| CN103926239A (en) * | 2013-01-11 | 2014-07-16 | 丹纳赫（上海）工业仪器技术研发有限公司 | Detection method for oxidable contaminant in aqueous sample |
| CN103278501A (en) * | 2013-06-26 | 2013-09-04 | 北京桑普生物化学技术有限公司 | COD quick detection solution, test box and determination method |
| CN109085049A (en) * | 2018-11-05 | 2018-12-25 | 中国石油化工股份有限公司 | COD detection method in a kind of sewage and recycled water |
Non-Patent Citations (2)
| Title |
|---|
| 何宏平;: "COD在线分析仪选型浅析" * |
| 刘蓉;: "湘潭地区高锰酸钾法地表水检测分析" * |
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