CN111595789A - Device and method for in-situ online monitoring of total nitrogen and total phosphorus in ocean water - Google Patents
Device and method for in-situ online monitoring of total nitrogen and total phosphorus in ocean water Download PDFInfo
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- CN111595789A CN111595789A CN202010430459.0A CN202010430459A CN111595789A CN 111595789 A CN111595789 A CN 111595789A CN 202010430459 A CN202010430459 A CN 202010430459A CN 111595789 A CN111595789 A CN 111595789A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 53
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 47
- 239000011574 phosphorus Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 238000012544 monitoring process Methods 0.000 title claims description 11
- 239000000126 substance Substances 0.000 claims abstract description 36
- 230000003595 spectral effect Effects 0.000 claims abstract description 29
- 238000012806 monitoring device Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 48
- 239000008367 deionised water Substances 0.000 claims description 40
- 229910021641 deionized water Inorganic materials 0.000 claims description 40
- 238000010183 spectrum analysis Methods 0.000 claims description 40
- 238000001228 spectrum Methods 0.000 claims description 26
- 239000013535 sea water Substances 0.000 claims description 22
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 18
- 239000011259 mixed solution Substances 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 3
- 238000002329 infrared spectrum Methods 0.000 claims description 2
- 238000002211 ultraviolet spectrum Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 18
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 238000011066 ex-situ storage Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000004611 spectroscopical analysis Methods 0.000 abstract description 2
- 238000005375 photometry Methods 0.000 description 7
- 230000002572 peristaltic effect Effects 0.000 description 5
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 5
- 238000012937 correction Methods 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012625 in-situ measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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Classifications
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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
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/11—Filling or emptying of cuvettes
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/11—Filling or emptying of cuvettes
- G01N2021/115—Washing; Purging
Abstract
The invention discloses an in-situ online monitoring device and method for total nitrogen and total phosphorus in ocean water, and aims to solve the technical problems that in the prior art, the measurement precision is low and the use is inconvenient due to ex-situ measurement, the color developing agent influencing the chemical reaction and the filtered turbidity cannot be corrected due to discontinuous fine spectral measurement, and the detection efficiency is low due to the discrete detection of the total nitrogen and the total phosphorus. The invention provides a total nitrogen and total phosphorus online monitoring device and method for ocean underwater in-situ application, which combine a mode of combining chemical pretreatment and continuous fine spectrometry, integrally seal the monitoring device, adopt underwater invasive in-situ long-term measurement, and send measurement data to a shore or a wharf boat through a serial port.
Description
Technical Field
The invention relates to water body monitoring, in particular to an in-situ on-line monitoring device and method for total nitrogen and total phosphorus in ocean water.
Background
The total nitrogen and the total phosphorus are one of important indexes for reflecting the pollution degree of the water body and the eutrophication degree of the water body, and the increase of the content of the total phosphorus and the total nitrogen can lead to mass propagation of aquatic organisms such as microorganisms, algae and the like, thereby causing the eutrophication of the water body and the deterioration of the quality of the water body. The seawater has complex components, various forms and instantaneous changes, and the content of nutrient elements in the seawater is known by monitoring and analyzing the total nitrogen and total phosphorus in the seawater, so that the seawater plays a vital role in protecting a marine ecosystem.
The existing automatic total phosphorus monitor is based on a chemical method for detecting total phosphorus and only has different digestion methods and decomposition speeds of water samples. The main types of the method comprise persulfate high-temperature and high-pressure digestion-photometry, persulfate ultraviolet digestion-photometry and ultraviolet irradiation-molybdenum catalytic heating digestion-flow injection-photometry; the main types of the total nitrogen on-line automatic analyzer are persulfate high-temperature high-pressure digestion-photometry, closed combustion oxidation-chemiluminescence analysis, persulfate ultraviolet digestion-photometry and persulfate high-temperature high-pressure digestion-flow injection-photometry.
The above method has a number of disadvantages: firstly, the use type is a cabinet type machine, water needs to be pumped into the instrument for measurement and analysis, and the defects of ex-situ, inconvenient use and the like exist; secondly, the photometric measurement is single-spectrum point measurement, discontinuous fine spectrum measurement, and has no influence on a color developing agent of instrument chemical reaction, turbidity correction of filtration and the like; and thirdly, the total nitrogen and the total phosphorus are separately detected, so that the detection efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problems that the measurement precision is small and the use is inconvenient due to the non-in-situ measurement, the color developing agent influencing the chemical reaction and the filtered turbidity cannot be corrected due to the non-continuous fine spectral measurement, and the detection efficiency is low due to the separate detection of total nitrogen and total phosphorus in the prior art, and provides an in-situ on-line monitoring device and method for total nitrogen and total phosphorus in ocean water.
The invention provides a total nitrogen and total phosphorus online monitoring device and method for ocean underwater in-situ application, which combine a mode of combining chemical pretreatment and continuous fine spectrometry, integrally seal the monitoring device, adopt underwater invasive in-situ long-term measurement, and send measurement data to a shore or a wharf boat through a serial port.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water is characterized in that:
the device comprises a sealed shell, a waste liquid collecting barrel, a chemical pretreatment unit, an optical flow integrated unit, a spectrum analysis unit and a main control unit, wherein the chemical pretreatment unit, the optical flow integrated unit, the spectrum analysis unit and the main control unit are all positioned in the sealed shell;
the sealed shell is provided with a liquid inlet and a liquid outlet;
the input end of the chemical pretreatment unit is communicated with the liquid inlet and is used for treating seawater into liquid to be detected and outputting the liquid; the input end of the chemical pretreatment unit is also connected with deionized water;
the optical flow integrated unit comprises a total nitrogen pool, a total phosphorus pool and a one-to-two optical fiber bundle which are communicated with each other;
a first flow channel, a first light source and a first collimating mirror are arranged in the total nitrogen pool;
one end of the first flow channel is communicated with the output end of the chemical pretreatment unit;
after sequentially passing through the liquid to be detected in the first flow channel and the first collimating mirror, the light beam emitted by the first light source is transmitted to the spectral analysis unit through a one-to-two optical fiber beam;
a second flow channel, a second light source and a second collimating mirror are arranged in the total phosphorus pool;
one end of the second flow passage is communicated with the other end of the first flow passage;
the light beam emitted by the second light source sequentially passes through the liquid to be detected in the second flow channel and the second collimating mirror and then is transmitted to the spectral analysis unit through a one-to-two optical fiber beam;
the other end of the second flow channel is communicated with a waste liquid collecting barrel through a liquid outlet;
the spectrum analysis unit analyzes and processes the emergent light and transmits the spectrum data after analysis and processing to the main control unit;
the main control unit controls the chemical pretreatment unit, the optical flow integrated unit and the spectrum analysis unit, and carries out real-time calculation of total nitrogen and total phosphorus concentration according to the spectrum data.
Furthermore, the first flow channel and the second flow channel are both Z-shaped structures;
the first light source and the first collimating mirror are respectively positioned at two ends of the middle section of the first flow channel of the Z-shaped structure;
the second light source and the second collimating mirror are respectively positioned at two ends of the middle section of the second flow channel of the Z-shaped structure.
Further, the first light source and the second light source are both LED lamps.
Further, the spectral analysis unit comprises the ultraviolet-visible-near infrared spectral band.
Further, the wavelength range of the first light source is 380-720 nm;
the wavelength range of the second light source is 650-880 nm.
Further, the first flow passage and the second flow passage are communicated through a connecting pipe.
Based on an in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water, the invention also provides an in-situ on-line monitoring method for total nitrogen and total phosphorus in ocean water, which is characterized by comprising the following steps:
step 1, collecting continuous spectral data of a nitrous nitrogen mixed solution and spectral data of first deionized water;
1.1. extracting seawater through a chemical pretreatment unit and pretreating the seawater to obtain a nitrite nitrogen mixed solution;
1.2. the nitrite nitrogen mixed liquid enters a total nitrogen pool in the optical flow integrated unit, a first light source is started, a second light source is closed, light beams emitted by the first light source pass through the nitrite nitrogen mixed liquid and are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle, the spectral analysis unit analyzes and processes the collected light beams to obtain continuous spectral data of the nitrite nitrogen mixed liquid, and the continuous spectral data of the nitrite nitrogen mixed liquid is transmitted to a main control unit for storage;
1.3. extracting deionized water through a chemical pretreatment unit;
1.4. deionized water enters a total nitrogen pool, light beams emitted by a first light source pass through the deionized water and are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle, the spectral analysis unit analyzes and processes the collected light beams to obtain first deionized water spectral data, and the first deionized water spectral data are transmitted to a main control unit for storage;
step 2, acquiring spectral data of the orthophosphate mixed solution and spectral data of second deionized water;
2.1. extracting seawater through a chemical pretreatment unit and pretreating the seawater to obtain orthophosphate mixed liquor;
2.2. the orthophosphate mixed liquid enters a total phosphorus pool, a first light source is closed, a second light source is started, light beams emitted by the second light source are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle after passing through the orthophosphate mixed liquid, the spectral analysis unit analyzes and processes the collected light beams to obtain the spectral data of the orthophosphate mixed liquid, and the spectral data of the orthophosphate mixed liquid is transmitted to a main control unit for storage;
2.3. extracting deionized water through a chemical pretreatment unit;
2.4. deionized water enters the total nitrogen pool, light beams emitted by the second light source pass through the deionized water and are transmitted to the spectral analysis unit, the spectral analysis unit analyzes and processes the collected light beams to obtain second deionized water spectral data, and the second deionized water spectral data are transmitted to the main control unit for storage;
the main control unit calculates the concentration of total nitrogen and total phosphorus in the seawater in real time through the stored continuous spectrum data of the nitrite nitrogen mixed solution, the first deionized water spectrum data, the spectrum data of the orthophosphate mixed solution and the second deionized water spectrum data.
Further, the light beam emitted by the first light source in the step 1 is collimated by a first collimating mirror after passing through the nitrous nitrogen mixed solution or the deionized water;
and 2, the light beam emitted by the second light source is collimated by a second collimating mirror after passing through orthophosphate mixed liquor or deionized water.
Further, when the light beams are collected in the steps 1.2) and 2.2), the first light source and the second light source flicker at least three times, and one second is arranged at intervals each time.
Further, the method comprises the following steps of; when the spectrum analysis unit analyzes and processes the collected light beams, the analysis spectrum section of the light beams is an ultraviolet spectrum, a visible light spectrum and a near infrared spectrum in sequence.
The invention has the beneficial effects that:
1. compared with the traditional cabinet type measuring device, the ocean underwater total nitrogen and total phosphorus in-situ on-line monitoring device has good underwater in-situ measurement capability, can be directly placed in seawater for measurement, and further achieves the purpose of real-time measurement.
2. The invention obtains the information required by measurement through continuous fine spectrum, has the capability of correcting the influence of turbidity after seawater filtration and the influence of chromaticity of the color developing agent, and further improves the measurement accuracy.
3. The invention realizes the whole machine light stream integrated detection of total nitrogen and total phosphorus by a mechanical combination mode, and the detection efficiency is higher.
Drawings
FIG. 1 is a schematic structural diagram of an in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water.
Description of the drawings:
1-sealed housing, 11-liquid inlet, 12-liquid outlet;
2-a waste liquid collecting barrel;
3-a chemical pretreatment unit;
4-optical flow integrated unit, 41-total nitrogen pool, 411-first flow channel, 412-first light source, 413-first collimating mirror, 42-total phosphorus pool, 421-second flow channel, 422-second light source, 423-second collimating mirror, 43-one-to-two optical fiber bundle, 431-SMA905 interface and 44-connecting pipe;
5-a spectral analysis unit;
6-main control unit.
Detailed Description
In order to make the objects, advantages and features of the present invention clearer, the following describes a device and a method for in-situ online monitoring of total nitrogen and total phosphorus in ocean water, which are provided by the present invention, in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in simplified form and are not to precise scale, the intention being solely for the convenience and clarity of illustrating embodiments of the invention; second, the structures shown in the drawings are often part of actual structures.
The invention relates to a total nitrogen and total phosphorus online monitoring device for marine underwater in-situ application, which is shown in figure 1 and mainly comprises four parts: the device comprises a chemical pretreatment unit 3, an optical flow integrated unit 4, a spectral analysis unit 5 and a control unit 6;
the chemical pretreatment unit 3 adopts a relevant chemical pretreatment mode of a national standard method and is used for treating seawater into a liquid to be detected and outputting the liquid;
the optical flow integrated unit 4 comprises a first light source 412 (with a central wavelength of 540nm and a bandwidth of 20nm, or a white led with a wavelength of 380-720 nm), a first flow channel 411, a first collimating mirror 413, an SMA905 interface 431, a two-in-one optical fiber bundle 43, a second collimating mirror 423, a second flow channel 421, a connecting pipe 44 and a second light source 422 (with a central wavelength of 880nm and a bandwidth of 20 nm);
the spectral analysis unit 5 is composed of a continuous fine spectral analysis module, and the analysis spectrum band is ultraviolet-visible-near infrared (typical spectrum band: 185-1100 nm, spectral resolution is nanometer level, blazed wave band is 540nm, 880 nm);
the control unit 6 mainly comprises an electronic driving system consisting of an ARM, a DSP or an FPGA and a singlechip, and is used for realizing light source control, driving of a peristaltic pump, a motor and the like of a chemical preprocessing unit, acquisition control of a spectrometer, receiving and processing of spectrum data, sending of generated information after data processing and the like.
The device for in-situ online monitoring of total nitrogen and total phosphorus in ocean water is arranged in a sealed shell 1, so that the device can be directly arranged under water, a liquid inlet 11 and a liquid outlet 12 are arranged on the sealed shell 1, the liquid inlet 11 is communicated with the input end of a chemical pretreatment unit 3, and the liquid outlet 12 is communicated with a waste liquid collecting barrel 2;
the working mode is as follows:
after the device is powered on, according to a program set in the main control unit 6, a peristaltic pump in the chemical pretreatment unit 3 is started, a proper amount of seawater is pumped, a mixed solution containing nitrite nitrogen is finally formed after passing through the chemical pretreatment unit 3, the mixed solution containing nitrite nitrogen enters a first flow channel 411 in the optical flow integrated unit 4, at this time, a first light source 412 is started (a second light source 422 is in a closed state), the first light source 412 is continuously and intermittently turned on and off for 5 times (the on and off interval time can be set, usually 1 second), a light beam emitted by the first light source 412 enters a spectral analysis unit 5 through a one-to-two optical fiber bundle 43 to be received and stored after passing through the mixed solution containing nitrite nitrogen, at this time, the first light source 412 is turned off, the control unit 6 drives the peristaltic pump of the chemical pretreatment unit 3 to pump deionized water to flush the first flow channel, at this time, the first light source, continuously and intermittently turning on and off for 5 times (the turn-on and turn-off interval time can be set, and is usually 1 second), the light beam emitted by the first light source 412 passes through the deionized water, enters the spectral analysis unit 5 through the one-to-two optical fiber bundle 43, is received, and is stored;
after the above steps are finished, according to a set program, a peristaltic pump of the chemical pretreatment unit 3 is started, a proper amount of seawater is pumped, the mixture of orthophosphates is formed by the chemical pretreatment unit 3, the orthophosphates enters the optical flow integrated unit 4 and enters the second flow channel 421, the second light source 422 is started (the first light source 412 is in a closed state), the continuous and intermittent on and off are performed for 5 times (the on and off interval time can be set, usually 1 second), the light emitted by the second light source 422 passes through the orthophosphates mixture and then enters the spectrum analysis unit 5 through the one-to-two optical fiber bundle 43 to be received and stored, the second light source 422 is closed at this time, the control unit 6 drives the peristaltic pump of the chemical pretreatment unit 3, the deionized water is pumped to flush the second flow channel 421, the second light source 422 is started (the first light source 412 is in a closed state), the continuous and intermittent on and off are performed for 5 times (the on and, typically 1 second), the light beam emitted from the second light source 422 passes through the deionized water, enters the spectral analysis unit 5 through the one-to-two optical fiber bundle 43, is received and stored, and at this time, the second light source 422 is turned off.
Ending an acquisition cycle; the acquired data includes: the continuous spectrum data of the nitrite nitrogen mixed liquid, the spectrum data of first deionized water (a first light source 412), the spectrum data of the orthophosphate mixed liquid and the spectrum data of second deionized water (a second light source 422) enter a main control unit 6, the main control unit carries out data processing pretreatment steps such as chromaticity correction, turbidity correction and standard water removal through the four groups of data, the measurement of the concentrations of the nitrite nitrogen and the orthophosphate is realized through the Lambert-beer law, and then the concentrations of total nitrogen and total phosphorus in seawater are calculated through the chemical reaction ion corresponding relation of the chemical pretreatment unit.
In this embodiment, the first light source 412 and the second light source 422 are both LED lamps, and the positions of the total nitrogen pool and the total phosphorus pool can be switched, and the corresponding measurement steps can also be switched.
Claims (10)
1. The utility model provides an ocean is total nitrogen total phosphorus normal position on-line monitoring device under water which characterized in that:
the device comprises a sealed shell (1), a waste liquid collecting barrel (2), a chemical pretreatment unit (3), an optical flow integrated unit (4), a spectrum analysis unit (5) and a main control unit (6), wherein the chemical pretreatment unit, the optical flow integrated unit (4), the spectrum analysis unit and the main control unit are all positioned in the sealed shell (1);
the sealed shell (1) is provided with a liquid inlet (11) and a liquid outlet (12);
the input end of the chemical pretreatment unit (3) is communicated with the liquid inlet (11) and is used for processing seawater into liquid to be detected and outputting the liquid; the input end of the chemical pretreatment unit (3) is also connected with deionized water;
the optical flow integrated unit (4) comprises a total nitrogen pool (41), a total phosphorus pool (42) and a one-to-two optical fiber bundle (43) which are communicated with each other;
a first flow channel (411), a first light source (412) and a first collimating mirror (413) are arranged in the total nitrogen pool (41);
one end of the first flow channel (411) is communicated with the output end of the chemical pretreatment unit (3);
the light beam emitted by the first light source (412) sequentially passes through the liquid to be detected in the first flow channel (411) and the first collimating mirror (413) and then is transmitted to the spectral analysis unit (5) through a one-to-two optical fiber bundle (43);
a second flow channel (421), a second light source (422) and a second collimating mirror (423) are arranged in the total phosphorus pool (42);
one end of the second flow channel (421) is communicated with the other end of the first flow channel (411);
the light beam emitted by the second light source (422) sequentially passes through the liquid to be detected in the second flow channel (421) and the second collimating mirror (423) and then is transmitted to the spectrum analysis unit (5) through a one-to-two optical fiber bundle (43);
the other end of the second flow channel (421) is communicated with the waste liquid collecting barrel (2) through a liquid outlet (12);
the spectrum analysis unit (5) analyzes and processes the emergent light and transmits the spectrum data after analysis and processing to the main control unit (6);
the main control unit (6) controls the chemical pretreatment unit (3), the optical flow integration unit (4) and the spectrum analysis unit (5), and carries out real-time calculation of total nitrogen and total phosphorus concentration according to the spectrum data.
2. The in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water as claimed in claim 1, wherein:
the first flow channel (411) and the second flow channel (421) are both Z-shaped structures;
the first light source (412) and the first collimating mirror (413) are respectively positioned at two ends of the middle section of the Z-shaped structure first flow channel (411);
the second light source (422) and the second collimating mirror (423) are respectively positioned at two ends of the middle section of the second flow channel (421) of the Z-shaped structure.
3. The in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water as claimed in claim 2, wherein:
the first light source (412) and the second light source (422) are both LED lamps.
4. The in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water as claimed in any one of claims 1 to 3, wherein:
the spectral analysis unit (5) comprises the ultraviolet-visible-near infrared spectral band.
5. The in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water as claimed in claim 4, wherein:
the wavelength range of the first light source (412) is 380-720 nm;
the wavelength range of the second light source (422) is 650-880 nm.
6. The in-situ on-line monitoring device for total nitrogen and total phosphorus in ocean water as claimed in claim 5, wherein: the first flow passage (411) is communicated with the second flow passage (421) through a connecting pipe (44).
7. An in-situ on-line monitoring method for total nitrogen and total phosphorus in ocean water based on any one of claims 1 to 6, which is characterized by comprising the following steps:
step 1, collecting continuous spectral data of a nitrous nitrogen mixed solution and spectral data of first deionized water;
1.1. extracting seawater through a chemical pretreatment unit and pretreating the seawater to obtain a nitrite nitrogen mixed solution;
1.2. the nitrite nitrogen mixed liquid enters a total nitrogen pool in the optical flow integrated unit, a first light source is started, a second light source is closed, light beams emitted by the first light source pass through the nitrite nitrogen mixed liquid and are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle, the spectral analysis unit analyzes and processes the collected light beams to obtain continuous spectral data of the nitrite nitrogen mixed liquid, and the continuous spectral data of the nitrite nitrogen mixed liquid is transmitted to a main control unit for storage;
1.3. extracting deionized water through a chemical pretreatment unit;
1.4. deionized water enters a total nitrogen pool, light beams emitted by a first light source pass through the deionized water and are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle, the spectral analysis unit analyzes and processes the collected light beams to obtain first deionized water spectral data, and the first deionized water spectral data are transmitted to a main control unit for storage;
step 2, acquiring spectral data of the orthophosphate mixed solution and spectral data of second deionized water;
2.1. extracting seawater through a chemical pretreatment unit and pretreating the seawater to obtain orthophosphate mixed liquor;
2.2. the orthophosphate mixed liquid enters a total phosphorus pool, a first light source is closed, a second light source is started, light beams emitted by the second light source are transmitted to a spectral analysis unit through a one-to-two optical fiber bundle after passing through the orthophosphate mixed liquid, the spectral analysis unit analyzes and processes the collected light beams to obtain the spectral data of the orthophosphate mixed liquid, and the spectral data of the orthophosphate mixed liquid is transmitted to a main control unit for storage;
2.3. extracting deionized water through a chemical pretreatment unit;
2.4. the deionized water enters the total nitrogen pool, the light beam emitted by the second light source passes through the deionized water and is transmitted to the spectral analysis unit, the spectral analysis unit analyzes and processes the collected light beam to obtain second deionized water spectral data, and the second deionized water spectral data is transmitted to the main control unit for storage;
step 3, data processing and real-time calculation;
the main control unit calculates the concentration of total nitrogen and total phosphorus in the seawater in real time through the stored continuous spectrum data of the nitrite nitrogen mixed solution, the first deionized water spectrum data, the spectrum data of the orthophosphate mixed solution and the second deionized water spectrum data.
8. The method for in-situ on-line monitoring of total nitrogen and total phosphorus in ocean water according to claim 7, wherein the method comprises the following steps:
in the step 1, the light beam emitted by the first light source is collimated by a first collimating mirror after passing through the nitrite nitrogen mixed solution or the deionized water;
and 2, the light beam emitted by the second light source is collimated by a second collimating mirror after passing through orthophosphate mixed liquor or deionized water.
9. The in-situ on-line monitoring method for total nitrogen and total phosphorus in ocean water as claimed in claim 7 or 8, wherein:
and 1.2) and 2.2) when light beam collection is carried out, the first light source and the second light source flicker at least three times, and one second is separated every time.
10. The in-situ on-line monitoring method for total nitrogen and total phosphorus in ocean water as claimed in claim 9, wherein: when the spectrum analysis unit analyzes and processes the collected light beams, the analysis spectrum section of the light beams is an ultraviolet spectrum, a visible light spectrum and a near infrared spectrum in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430459.0A CN111595789A (en) | 2020-05-20 | 2020-05-20 | Device and method for in-situ online monitoring of total nitrogen and total phosphorus in ocean water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114324166A (en) * | 2021-12-31 | 2022-04-12 | 中国科学院西安光学精密机械研究所 | Self-cleaning fine spectrum water body parameter measuring device and method based on turbidity correction |
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