CN110987860B - COD detection method based on infrared technology - Google Patents
COD detection method based on infrared technology Download PDFInfo
- Publication number
- CN110987860B CN110987860B CN201911309578.4A CN201911309578A CN110987860B CN 110987860 B CN110987860 B CN 110987860B CN 201911309578 A CN201911309578 A CN 201911309578A CN 110987860 B CN110987860 B CN 110987860B
- Authority
- CN
- China
- Prior art keywords
- spectrum
- detection
- module
- cod
- half barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 155
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 150000002500 ions Chemical class 0.000 claims abstract description 71
- 238000002329 infrared spectrum Methods 0.000 claims abstract description 39
- 238000001228 spectrum Methods 0.000 claims description 64
- 239000007788 liquid Substances 0.000 claims description 59
- 238000000862 absorption spectrum Methods 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 15
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000918 plasma mass spectrometry Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 229910021645 metal ion Inorganic materials 0.000 abstract 1
- 150000001450 anions Chemical class 0.000 description 21
- 150000001768 cations Chemical class 0.000 description 20
- 239000000126 substance Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000004497 NIR spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a COD detection method based on an infrared technology, and designs novel detection equipment which simultaneously detects Fourier infrared spectrum and the concentration content of various ions in water, automatically deducts the interference of various metal ions and organic components, and reduces the detection deviation caused by different types of water quality during detection. The method has the advantages of high processing speed and small error, and can carry out transverse comparison under the same algorithm when actually carrying out comparison of different water qualities, so that the comparison result is more objective.
Description
Technical Field
The invention relates to the field of water quality detection, in particular to a COD (chemical oxygen demand) detection method based on an infrared technology.
Background
Chemical Oxygen demand (cod) (chemical Oxygen demand) is a chemical method for measuring the amount of reducing substances to be oxidized in a water sample. The oxygen equivalent of a substance (typically an organic substance) that can be oxidized by a strong oxidizing agent in wastewater, wastewater treatment plant effluent, and contaminated water. In the research of river pollution and industrial wastewater properties and the operation management of wastewater treatment plants, it is an important and relatively fast measurable organic pollution parameter, often denoted by the symbol COD
The technology of detecting COD by using the spectroscopy is quite common in the prior art, for example, "the COD content in wastewater is determined by using ultraviolet-near infrared spectroscopy", Zhongyang, and the like, the report of environmental engineering, volume 11, No. 2, discloses a method for detecting COD in water by using the spectroscopy. However, the current spectral detection method cannot generally eliminate the interference of ions; since ions not only affect the detection result of the spectrum, but also actually may bring a certain COD value, it is inaccurate to directly subtract ions.
Disclosure of Invention
In view of the above, to solve the above problems, a COD detection method based on infrared technology is provided, which uses the following detection device, wherein the detection device comprises a master control module, an ion concentration detection module, an infrared spectrum detection module, and a sampling module, and is characterized in that:
the master control module is connected with the ion concentration detection module, the infrared spectrum detection module and the sampling module by cables;
a plurality of ion sensors are arranged in the ion concentration detection module, the ion sensors are used for detecting the field ion concentration in water and sending the field ion concentration to the master control module, and the field ion concentration comprises Fe3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c);
a light source, a liquid detection pool and a light detector are arranged in the infrared spectrum detection module; the water to be detected flows through the liquid detection pool, and the light emitted by the light source enters the liquid detection pool, is reflected for multiple times in the liquid detection pool and then enters the detector module; the detector module detects the spectrum of the emergent light and sends the spectrum to the master control module;
equivalent spectra and equivalent COD values of different ions with different concentrations are stored in the master control module, the field ion concentration is converted into the equivalent spectrum by the master control module, and then the equivalent spectrum of the field ion concentration is subtracted from the infrared absorption spectrum measured by the infrared spectrum detection module to obtain a difference spectrum; the main control module inputs the differential spectrum into a COD calculation model to obtain the field COD concentration in the water, and then adds the field COD concentration to an equivalent COD value corresponding to the field ion concentration to obtain the actual water quality COD concentration;
the sampling module is used for sampling while performing infrared spectrum detection, and a sampled water sample can be subjected to high-precision analysis and detection by a laboratory to obtain more accurate high-precision ion concentration;
the master control module converts the high-precision ion concentration into an equivalent spectrum, and then subtracts the equivalent spectrum of the high-precision ion concentration from the infrared spectrum detection module (1) on the basis of an infrared absorption spectrum measured in a laboratory to obtain a high-precision difference spectrum; the master control module inputs the high-precision differential spectrum into the COD calculation model to obtain the high-precision COD concentration in water, and then adds the equivalent COD value corresponding to the high-precision ion concentration to the high-precision COD concentration to obtain the actual high-precision water quality COD concentration.
The ion concentration detection module and the infrared spectrum detection module are connected to the master control module through cables, the infrared spectrum detection module and the ion concentration detection module are put into water to be detected during detection, and then the master control module is started to enable the ion concentration detection module to detect Fe in the water3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c); and simultaneously, the infrared spectrum detection module detects the infrared absorption spectrum of the water.
The infrared spectrum detection module comprises a light source module, a liquid detection pool, a detector module, an angle encoder and a spectrum control module;
the spectrum control module is connected with the light source module, the angle encoder and the detector module; light emitted by the light source module is transmitted to an incident port of the liquid detection pool through the optical fiber, is reflected to an exit port after being reflected for multiple times on the inner wall of the liquid detection pool, and light at the exit port is transmitted to the detector module through the optical fiber;
the liquid detection pool is integrally barrel-shaped, and the upper surface and the lower surface of the barrel-shaped are provided with a water inlet hole and a water outlet hole; the liquid detection pool is composed of an upper half barrel and a lower half barrel; the incident port is arranged on the lower half barrel, and the emergent port is arranged on the upper half barrel; the upper half barrel and the lower half barrel can rotate around the central axis of the barrel shape; the light entering the entrance port reaches the upper half barrel after being reflected once by the lower half barrel, reaches the other side of the upper half barrel after being reflected once by the upper half barrel, and then is reflected to the lower half barrel in a reciprocating manner, so that the light can return to the entrance port after being reflected repeatedly on n equal division points of the peripheral wall of the upper half barrel and the lower half barrel;
the upper half barrel and the lower half barrel can rotate mutually, so that the positions of the upper half barrel and the lower half barrel can be controlled, and light can reach the exit port and be led out after being reflected for different times in the liquid detection pool; the angle encoder is used for recording the relative angle of the emergent port and the incident port; the spectrum controller can convert the angle of the angle encoder into an optical path L from the incident port to the emergent port;
when detection is carried out, the upper half barrel and the lower half barrel of the liquid detection pool are controlled to rotate firstly, so that the optical path L reaches a minimum value L1, and the detector module carries out detection to obtain a baseline spectrum; then controlling the upper half barrel and the lower half barrel of the liquid detection pool to rotate so that the optical path L reaches an optical path L2, and detecting by the detector module to obtain a long-range spectrum; the optical path length L2 satisfies that the long-range spectrum detected by the detector has an intensity variation exceeding a threshold value with respect to the baseline spectrum.
The sampling module is arranged on the liquid detection pool and comprises a driving part and a sealing cover; the driving part is provided with a driving motor for driving the closing cover to move; the sealing cover is provided with two liquid accommodating cavities which are arranged at the positions of the water inlet hole and the water outlet hole of the liquid detection pool in a protruding manner; the sealing cover can seal the water inlet hole and the water outlet hole of the liquid detection pool under the driving of the driving motor; after the sealing cover seals the water inlet and the water outlet of the liquid detection pool, the whole volume of the sample is larger than the volume of the liquid detection pool because the sealing cover is provided with the containing cavity;
when high-precision COD concentration calculation is carried out, a water sample in the sealing cover is used for carrying out high-precision analysis and test; and a water sample of the liquid detection pool is used for carrying out infrared spectrum test in a laboratory after high-precision ion concentration is obtained.
The high precision analytical test is plasma mass spectrometry.
The acquisition mode of equivalent spectra of different ions and different concentrations is that the infrared absorption spectrum is firstly measured in pure water, and then: fe3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -An anion and a cation in the group, detecting an infrared absorption spectrum; then subtracting the absorption spectrum of pure water from the obtained infrared absorption spectrum to obtain a group of anion and cation equivalent spectra with different concentrations; pairing all the anions and cations, and determining to obtain the pairs of all anions and cationsAn effective spectrum;
during actual detection, firstly, anions and cations in an actual detection water sample are split, the known anions and cations are split into combinations, and then the known anions and cations are converted into equivalent spectra.
The invention has the beneficial effects that:
the invention combines the infrared spectrum detection technology and the ion detection technology, and fully considers the interference and influence brought by different ions when the COD concentration is actually detected by the infrared spectrum; the equivalent spectra and the equivalent COD values of different ions are measured in advance, then the spectral interference caused by different ions is deducted during actual detection, and the equivalent COD value is added, so that the COD detection result is more accurate during detection;
the invention also designs a special liquid detection cell, and the upper half barrel and the lower half barrel of the detection cell can rotate, so that the times of reflecting infrared light on the inner wall can be adjusted, and the detection of infrared spectrum is more accurate.
The invention can not only rapidly detect the COD value on site, but also sample and then bring the sample back to a laboratory for detection by the same method, has higher precision, can be compared with the site measurement, and provides certain reference for the error of the site measurement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosed subject matter, are incorporated in and constitute a part of this specification. The drawings illustrate the implementations of the disclosed subject matter and, together with the detailed description, serve to explain the principles of implementations of the disclosed subject matter. No attempt is made to show structural details of the disclosed subject matter in more detail than is necessary for a fundamental understanding of the disclosed subject matter and various modes of practicing the same.
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic view of the infrared spectroscopy detection module of the present invention;
FIG. 3 is a schematic structural diagram of a liquid detection cell according to the present invention.
Detailed Description
The advantages, features and methods of accomplishing the same will become apparent from the drawings and the detailed description that follows.
Example 1:
the COD detection method based on the infrared technology uses the following detection device, and the detection device comprises a master control module, an ion concentration detection module, an infrared spectrum detection module 1 and a sampling module, and is characterized in that:
the master control module is connected with the ion concentration detection module, the infrared spectrum detection module (1) and the sampling module by cables;
a plurality of ion sensors are arranged in the ion concentration detection module, the ion sensors are used for detecting the field ion concentration in water and sending the field ion concentration to the master control module, and the field ion concentration comprises Fe3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c);
a light source, a liquid detection pool and a light detector are arranged in the infrared spectrum detection module 1; the water to be detected flows through the liquid detection pool, and the light emitted by the light source enters the liquid detection pool, is reflected for multiple times in the liquid detection pool and then enters the detector module; the detector module detects the spectrum of the emergent light and sends the spectrum to the master control module;
equivalent spectra and equivalent COD values of different ions with different concentrations are stored in the master control module, the field ion concentration is converted into the equivalent spectrum by the master control module, and then the equivalent spectrum of the field ion concentration is subtracted from the infrared absorption spectrum measured by the infrared spectrum detection module 1 to obtain a difference spectrum; the main control module inputs the differential spectrum into a COD calculation model to obtain the field COD concentration in the water, and then adds the field COD concentration to an equivalent COD value corresponding to the field ion concentration to obtain the actual water quality COD concentration;
the sampling module is used for sampling while performing infrared spectrum detection, and a sampled water sample can be subjected to high-precision analysis and detection by a laboratory to obtain more accurate high-precision ion concentration;
the master control module converts the high-precision ion concentration into an equivalent spectrum, and then subtracts the equivalent spectrum of the high-precision ion concentration from the infrared spectrum detection module 1 on the basis of an infrared absorption spectrum measured in a laboratory to obtain a high-precision differential spectrum; the master control module inputs the high-precision differential spectrum into the COD calculation model to obtain the high-precision COD concentration in water, and then adds the equivalent COD value corresponding to the high-precision ion concentration to the high-precision COD concentration to obtain the actual high-precision water quality COD concentration.
Ion concentration detection module and infrared spectrum detection module 1 all use the cable to be connected to total control module, and during the detection, infrared spectrum detection module 1 and ion concentration detection module drop into the aquatic of awaiting measuring, then open total control module, make the Fe that ion concentration detection module detected the aquatic3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c); meanwhile, the infrared spectrum detection module 1 detects the infrared absorption spectrum of water.
The infrared spectrum detection module 1 comprises a light source module, a liquid detection pool, a detector module, an angle encoder and a spectrum control module;
the spectrum control module is connected with the light source module, the angle encoder and the detector module; light emitted by the light source module is transmitted to an incident port 11 of the liquid detection pool through optical fibers, is reflected to an exit port 12 after being reflected for multiple times on the inner wall of the liquid detection pool, and light rays of the exit port 12 are transmitted to the detector module through the optical fibers;
the liquid detection pool is integrally barrel-shaped, and the upper surface and the lower surface of the barrel-shaped are provided with a water inlet hole and a water outlet hole; the liquid detection pool is composed of an upper half barrel and a lower half barrel; the incident port 11 is arranged on the lower half barrel 13, and the emergent port 12 is arranged on the upper half barrel 14; the upper half barrel and the lower half barrel can rotate around the central axis of the barrel shape; the light entering the entrance port 11 reaches the upper half barrel 14 after being reflected once by the lower half barrel 13, reaches the other side of the upper half barrel 14 after being reflected once by the upper half barrel 14, and then is reflected to the lower half barrel 13, and the reciprocating is carried out in such a way that the light can return to the entrance port 11 after being reflected repeatedly on n equal division points of the peripheral wall of the upper half barrel 13 and the lower half barrel 13;
because the upper half barrel 13 and the lower half barrel 13 can rotate mutually, the positions of the upper half barrel 13 and the lower half barrel 13 can be controlled, so that light is reflected for different times in the liquid detection pool and then reaches the exit port 12 to be led out; the angle encoder is used for recording the relative angle of the emergent port 12 and the incident port 11; the spectral controller can convert the angle of the angular encoder into an optical path L from the entrance port 11 to the exit port 12;
when detection is carried out, the upper half barrel 13 and the lower half barrel 13 of the liquid detection pool are controlled to rotate to enable the optical path L to reach a minimum value L1, and the detector module carries out detection to obtain a baseline spectrum; then, the upper half barrel 13 and the lower half barrel 13 of the liquid detection pool are controlled to rotate, so that the optical path L reaches an optical path L2, and the detector module performs detection to obtain a long-range spectrum; the optical path length L2 satisfies that the long-range spectrum detected by the detector has an intensity variation exceeding a threshold value with respect to the baseline spectrum.
The sampling module is arranged on the liquid detection pool and comprises a driving part and a sealing cover 2; the driving part is provided with a driving motor which is used for driving the closing cover 2 to move; the sealing cover 2 is provided with two liquid accommodating cavities which are arranged at the positions of a water inlet hole and a water outlet hole of the liquid detection pool in a protruding manner; the sealing cover 2 can seal the water inlet and the water outlet of the liquid detection pool under the driving of the driving motor; after the sealing cover 2 seals the water inlet and the water outlet of the liquid detection pool, the whole volume of the sample is larger than the volume of the liquid detection pool because the sealing cover 2 is provided with an accommodating cavity;
when high-precision COD concentration calculation is carried out, the water sample in the closed cover 2 is used for carrying out high-precision analysis and test; and a water sample of the liquid detection pool is used for carrying out infrared spectrum test in a laboratory after high-precision ion concentration is obtained.
Example 2:
the high precision analytical test is plasma mass spectrometry.
The acquisition mode of equivalent spectra of different ions and different concentrations is that the infrared absorption spectrum is firstly measured in pure water, and then: fe3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -An anion and a cation in the group, detecting an infrared absorption spectrum; then subtracting the absorption spectrum of pure water from the obtained infrared absorption spectrum to obtain a group of anion and cation equivalent spectra with different concentrations; pairing all the anions and cations, and determining to obtain equivalent spectra of all the anion and cation pairs;
during actual detection, firstly, anions and cations in an actual detection water sample are split, the known anions and cations are split into combinations, and then the known anions and cations are converted into equivalent spectra.
The acquisition mode of equivalent COD value of different ion different concentrations does, adds in the pure water: fe3+、Cu2+、Ca2+、Mg2 +、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -Detecting the COD value of one of the anions and one of the cations by a national standard method; then obtaining equivalent COD values of a group of anions and cations with different concentrations; pairing all the anions and the cations, and determining to obtain equivalent COD values of all the anion and cation pairs;
during actual detection, firstly, the anions and cations in an actual detection water sample are split into known anion and cation combinations, and then the known anion and cation combinations are converted into equivalent COD values.
The COD calculation model is established by the method that Fe is not contained3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -And (3) detecting the COD value in the ionized water and the infrared spectrum under a certain optical path, inputting the obtained spectrum and the COD value into an SVM algorithm, and establishing an SVM model of the infrared spectrum and the COD value.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. The COD detection method based on the infrared technology uses the following detection device, and the detection device comprises a master control module, an ion concentration detection module, an infrared spectrum detection module (1) and a sampling module, and is characterized in that: the master control module is connected with the ion concentration detection module, the infrared spectrum detection module (1) and the sampling module by cables; a plurality of ion sensors are arranged in the ion concentration detection module, the ion sensors are used for detecting the field ion concentration in water and sending the field ion concentration to the master control module, and the field ion concentration comprises Fe3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c);
a light source, a liquid detection pool and a light detector are arranged in the infrared spectrum detection module (1); the water to be detected flows through the liquid detection pool, and the light emitted by the light source enters the liquid detection pool, is reflected for multiple times in the liquid detection pool and then enters the detector module; the detector module detects the spectrum of the emergent light and sends the spectrum to the master control module;
equivalent spectra and equivalent COD values of different ions with different concentrations are stored in the master control module, the field ion concentration is converted into the equivalent spectrum by the master control module, and then the equivalent spectrum of the field ion concentration is subtracted from the infrared absorption spectrum measured by the infrared spectrum detection module (1) to obtain a difference spectrum; the main control module inputs the differential spectrum into a COD calculation model to obtain the field COD concentration in the water, and then adds the field COD concentration to an equivalent COD value corresponding to the field ion concentration to obtain the actual water quality COD concentration;
the sampling module is used for sampling while performing infrared spectrum detection, and a sampled water sample can be subjected to high-precision analysis and detection by a laboratory to obtain more accurate high-precision ion concentration;
the master control module converts the high-precision ion concentration into an equivalent spectrum, and then subtracts the equivalent spectrum of the high-precision ion concentration from the infrared spectrum detection module (1) on the basis of an infrared absorption spectrum measured in a laboratory to obtain a high-precision difference spectrum; the master control module inputs the high-precision differential spectrum into the COD calculation model to obtain the high-precision COD concentration in water, and then adds the equivalent COD value corresponding to the high-precision ion concentration to the high-precision COD concentration to obtain the actual high-precision water quality COD concentration.
2. The COD detection method based on infrared technology according to claim 1, characterized in that:
the ion concentration detection module and the infrared spectrum detection module (1) are connected to the master control module through cables, the infrared spectrum detection module (1) and the ion concentration detection module are put into water to be detected during detection, then the master control module is started, and the ion concentration detection module is enabled to detect Fe in the water3+、Cu2+、Ca2+、Mg2+、CO3 2-、HCO3 -、SO4 2-、Cl-、NO3 -The concentration of (c); meanwhile, the infrared spectrum detection module (1) is used for detecting the infrared absorption spectrum of the water.
3. The COD detection method based on infrared technology according to claim 2, characterized in that:
the infrared spectrum detection module (1) comprises a light source module, a liquid detection pool, a detector module, an angle encoder and a spectrum control module;
the spectrum control module is connected with the light source module, the angle encoder and the detector module; light emitted by the light source module is transmitted to an incident port (11) of the liquid detection pool through optical fibers, is reflected to an exit port (12) after being reflected for multiple times on the inner wall of the liquid detection pool, and light of the exit port (12) is transmitted to the detector module through the optical fibers;
the liquid detection pool is integrally barrel-shaped, and the upper surface and the lower surface of the barrel-shaped are provided with a water inlet hole and a water outlet hole; the liquid detection pool is composed of an upper half barrel and a lower half barrel; the incident port (11) is arranged on the lower half barrel (13), and the emergent port (12) is arranged on the upper half barrel (14); the upper half barrel and the lower half barrel can rotate around the central axis of the barrel shape; light entering the entrance port (11) reaches the upper half barrel (14) after being reflected once by the lower half barrel (13), reaches the other side of the upper half barrel (14) after being reflected once by the upper half barrel (14), and then is reflected to the lower half barrel (13), and the reciprocating is carried out, so that the light can return to the entrance port (11) after being reflected repeatedly on n equal division points of the peripheral wall of the upper half barrel (13) and the lower half barrel (13);
the upper half barrel (13) and the lower half barrel (13) can rotate mutually, so that the positions of the upper half barrel and the lower half barrel (13) can be controlled, and light reaches the exit port (12) after being reflected for different times in the liquid detection pool and is led out; the angle encoder is used for recording the relative angle of the exit port (12) and the entrance port (11); the spectrum controller can convert the angle of the angle encoder into an optical path L from the incident port (11) to the emergent port (12);
when detection is carried out, the upper half barrel and the lower half barrel (13) of the liquid detection pool are controlled to rotate to enable the optical path L to reach a minimum value L1, and the detector module carries out detection to obtain a baseline spectrum; then controlling the upper half barrel and the lower half barrel (13) of the liquid detection pool to rotate so that the optical path L reaches an optical path L2, and detecting by the detector module to obtain a long-range spectrum; the optical path length L2 satisfies that the long-range spectrum detected by the detector has an intensity variation exceeding a threshold value with respect to the baseline spectrum.
4. The COD detection method based on the infrared technology according to claim 3, characterized in that:
the sampling module is arranged on the liquid detection pool and comprises a driving part and a sealing cover (2); the driving part is provided with a driving motor which is used for driving the closing cover (2) to move; the sealing cover (2) is provided with two liquid accommodating cavities which are arranged at the positions of a water inlet hole and a water outlet hole of the liquid detection pool in a protruding manner; the sealing cover (2) can seal the water inlet hole and the water outlet hole of the liquid detection pool under the driving of the driving motor; after the sealing cover (2) seals the water inlet and the water outlet of the liquid detection pool, the whole volume of the sample is larger than the volume of the liquid detection pool as the sealing cover (2) is provided with the containing cavity;
when high-precision COD concentration calculation is carried out, a water sample in the closed cover (2) is used for carrying out high-precision analysis and test; and a water sample of the liquid detection pool is used for carrying out infrared spectrum test in a laboratory after high-precision ion concentration is obtained.
5. The COD detection method based on the infrared technology according to claim 4, characterized in that:
the high precision analytical test is plasma mass spectrometry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309578.4A CN110987860B (en) | 2019-12-18 | 2019-12-18 | COD detection method based on infrared technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309578.4A CN110987860B (en) | 2019-12-18 | 2019-12-18 | COD detection method based on infrared technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110987860A CN110987860A (en) | 2020-04-10 |
| CN110987860B true CN110987860B (en) | 2020-06-16 |
Family
ID=70095648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911309578.4A Expired - Fee Related CN110987860B (en) | 2019-12-18 | 2019-12-18 | COD detection method based on infrared technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110987860B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076338A (en) * | 2006-09-25 | 2008-04-03 | Mitsubishi Heavy Ind Ltd | Cod analyzer, cod analysis method and wastewater treatment system |
| CN203999060U (en) * | 2014-06-19 | 2014-12-10 | 佛山市云米电器科技有限公司 | Purifier |
| CN107632108A (en) * | 2017-08-30 | 2018-01-26 | 广东上风环保科技有限公司 | A kind of method for determining water chemical oxygen demand |
| CN109580519A (en) * | 2019-01-29 | 2019-04-05 | 杭州电子科技大学 | A kind of surface water COD on-line monitoring system and method based on ELM algorithm |
| CN109696410A (en) * | 2019-02-01 | 2019-04-30 | 天津城建大学 | A kind of polyethers production waste water dissolubility COD rapid detection method |
-
2019
- 2019-12-18 CN CN201911309578.4A patent/CN110987860B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076338A (en) * | 2006-09-25 | 2008-04-03 | Mitsubishi Heavy Ind Ltd | Cod analyzer, cod analysis method and wastewater treatment system |
| CN203999060U (en) * | 2014-06-19 | 2014-12-10 | 佛山市云米电器科技有限公司 | Purifier |
| CN107632108A (en) * | 2017-08-30 | 2018-01-26 | 广东上风环保科技有限公司 | A kind of method for determining water chemical oxygen demand |
| CN109580519A (en) * | 2019-01-29 | 2019-04-05 | 杭州电子科技大学 | A kind of surface water COD on-line monitoring system and method based on ELM algorithm |
| CN109696410A (en) * | 2019-02-01 | 2019-04-30 | 天津城建大学 | A kind of polyethers production waste water dissolubility COD rapid detection method |
Non-Patent Citations (2)
| Title |
|---|
| Chemometric tools for the authentication of cod liver oil based on nuclear magnetic resonance and infrared spectroscopy data;Editha Giese et al;《Analytical and Bioanalytical Chemistry》;20191012;第6931-6942页 * |
| 近红外光谱法同时测定废水中化学需氧量和生化需氧量;李天春;《新材料与新技术》;20190531;第45卷(第5期);第80，178页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110987860A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102661923A (en) | Complex monitor for automatically monitoring multiple parameters of water on line | |
| CN101183071B (en) | Novel water quality analysis meter | |
| CN203275288U (en) | Online automatic water quality multiple parameter monitor gathering spectrum and sensor technologies | |
| CN101105440A (en) | Method for measuring water body total nitrogen and total phosphorous by digestion spectrophotometry of ultraviolet cooperating with ozone | |
| CN109374559B (en) | Water body COD value determination method based on ultraviolet absorption spectrum | |
| AU2011303944B2 (en) | Method of measuring the uranium concentration of an aqueous solution by spectrophotometry | |
| CN106404681A (en) | Water quality detection method and system | |
| CN106442370A (en) | On-line water quality detector and on-line water quality detecting method | |
| CN102706828B (en) | Chemical oxygen demand detecting device and detecting method | |
| US10768117B2 (en) | Device for detecting algae concentration using first derivative of visible light absorbance | |
| CN110987860B (en) | COD detection method based on infrared technology | |
| CN113065095B (en) | Ultraviolet spectrum-based detection algorithm for nitrogen content in water | |
| CN110736723A (en) | method and system for online simultaneous detection of low turbidity and high turbidity | |
| Bürck | Spectrophotometric determination of uranium and nitric acid by applying partial least-squares regression to uranium (VI) absorption spectra | |
| CN209821063U (en) | COD sensor | |
| CN208109693U (en) | COD water quality on-line checking analyzer | |
| CN208171847U (en) | A kind of photoelectric sensing measuring device | |
| Xiao et al. | Synchronous fluorescence and absorbance dynamic liquid drop sensor for Cr (VI) determination at the femtomole level | |
| Kim et al. | Real-time spectroscopic methods for analysis of organic compounds in water | |
| CN106596433A (en) | Water quality detection system provided with heating system | |
| CN202339327U (en) | Water quality multi-component heavy-metal analyzer | |
| CN206057167U (en) | Fresh logistics based on intelligent sealing tape lock is with bar-shaped water quality monitoring sensor | |
| CN108088814A (en) | A kind of method that potentiometric titrations are quantitatively detected using laser flash photolysis technology | |
| CN219284999U (en) | Deep sea differential spectrum type water quality sensor | |
| CN116297251B (en) | Multi-sensor combined water quality detection system and detection probe thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200616 Termination date: 20211218 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |