CN219675816U - Cold atom optical path absorption cell device for mercury detector - Google Patents
Cold atom optical path absorption cell device for mercury detector Download PDFInfo
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- CN219675816U CN219675816U CN202320887918.7U CN202320887918U CN219675816U CN 219675816 U CN219675816 U CN 219675816U CN 202320887918 U CN202320887918 U CN 202320887918U CN 219675816 U CN219675816 U CN 219675816U
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 136
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 52
- 230000003287 optical effect Effects 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000002834 transmittance Methods 0.000 claims description 6
- 238000002459 porosimetry Methods 0.000 claims description 5
- 238000002310 reflectometry Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000002835 absorbance Methods 0.000 description 8
- 239000012159 carrier gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 description 2
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- 235000011150 stannous chloride Nutrition 0.000 description 2
- 239000001119 stannous chloride Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Abstract
The cold atomic optical path absorption cell device for the mercury meter comprises a device main body, and a light source system, an absorption cell system and a detection system which are arranged in the device main body, wherein the absorption cell system comprises a long cell absorption cell channel, a middle cell absorption cell channel, a short cell absorption cell channel and a buffer cell channel which are connected end to end through a serial channel, and the buffer cell channel is arranged between the middle cell absorption cell channel and the short cell absorption cell channel; the middle pool absorption pool channel and the short pool absorption pool channel are positioned on the same first optical path and are parallel to a second optical path where the long pool absorption pool channel is positioned; the optical path control system comprises lens components arranged at two ends of the first optical path and the second optical path and is used for focusing and turning transmission of light rays. The utility model can improve the optical path, enhance the sensitivity, obtain excellent detection limit and realize the accurate analysis of ultra-trace mercury elements.
Description
Technical Field
The utility model relates to a mercury meter, in particular to a cold atom optical path absorption cell device for the mercury meter.
Background
Mercury meters are known as a high sensitivity instrument for measuring atomic absorption spectra for mercury. The working principle is as follows: mercury vapor selectively absorbs 253.7nm ultraviolet light, and the absorbed light is proportional to the mercury concentration within a certain concentration range. After the water sample is digested, various forms of mercury are converted into bivalent mercury, the bivalent mercury is reduced into elemental mercury by stannous chloride, and the generated mercury vapor is brought into an absorption cell of a mercury meter by carrier gas to measure absorbance, and the absorbance is compared and quantified with the absorbance of a mercury standard solution.
The cold atomic absorption method is one of measuring methods of mercury meters, and the principle is as follows: mercury vapor selectively absorbs 253.7nm ultraviolet light, and the absorbed light is proportional to the mercury concentration within a certain concentration range. After the water sample is digested, various forms of mercury are converted into bivalent mercury, the bivalent mercury is reduced into elemental mercury by stannous chloride, and the generated mercury vapor is brought into an absorption cell of a mercury meter by carrier gas to measure absorbance, and the absorbance is compared and quantified with the absorbance of a mercury standard solution.
At present, the following situations are commonly existed in an optical path absorption cell used for a mercury analyzer applying a cold atomic absorption spectrum principle:
1. the absorption cell type has a single absorption cell and a long/short absorption cell, and the length is generally not more than 10cm;
2. the inner diameter of the absorption tank is larger and generally reaches more than 3 mm;
3. the intensity of the mercury lamp light source entering the absorption tank is insufficient.
The current situation causes the problem that the detection limit is often not ideal when mercury meter equipment analyzes ultra-trace mercury elements, and particularly the ultra-trace mercury test in surface water or underground water samples.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides the cold atom optical path absorption cell device for the mercury detector, which can improve the optical path, enhance the sensitivity, obtain excellent detection limit and realize the accurate analysis of ultra-trace mercury elements.
The technical scheme adopted for solving the technical problems is as follows:
a cold atom optical path absorption cell device for mercury measurer comprises a device main body, a light source system, an absorption cell system and a detection system which are arranged in the device main body,
the absorption tank system comprises a long tank absorption tank channel, a middle tank absorption tank channel, a short tank absorption tank channel and a buffer tank channel arranged between the middle tank absorption tank channel and the short tank absorption tank channel which are connected end to end through a serial channel; the middle pool absorption pool channel and the short pool absorption pool channel are positioned on the same first optical path and are parallel to a second optical path where the long pool absorption pool channel is positioned;
the optical path control system comprises lens components arranged at two ends of the first optical path and the second optical path and is used for focusing and turning transmission of light rays.
Optionally, the detection system includes a first detector and a second detector disposed at ends of the first optical path and the second optical path, respectively.
Optionally, the lens assembly includes a focusing lens, a semi-transparent semi-reflective lens, and a total reflection lens; the focusing lens is arranged between the light source system and the head end of the long pool absorption pool channel; the semi-transparent semi-reflective lens is arranged between the tail end of the long-tank absorption tank channel and the first detector; the total reflection lens is arranged at the head end of the middle tank absorption tank channel and is aligned with the semi-transparent semi-reflective lens.
Optionally, the transmittance and the reflectance of the semi-transparent and semi-reflective lens are both 50%, and the transmittance of the total-reflective lens is 96%.
Optionally, the system also comprises a temperature control system for enabling the absorption tank system to be in a temperature range of 100-150 ℃; the temperature control system comprises a heating rod, a thermocouple and a temperature controller, wherein the heating rod and the thermocouple are arranged in the device main body, and the temperature controller is arranged outside the device main body and is respectively connected with the heating rod and the thermocouple to form a temperature control loop.
Optionally, a steam inlet is arranged at the side part of the head end of the long-tank absorption tank channel; and one side part of the tail end of the short pool absorption pool channel is provided with an exhaust gas outlet, the other side part of the tail end of the short pool absorption pool channel is connected with one end of the buffer pool channel, and the other end of the buffer pool channel is connected with the tail end of the middle pool absorption pool channel at the same side.
Optionally, the inner diameter size range of the long pool absorption pool channel, the middle pool absorption pool channel and the short pool absorption pool channel is 0.5-2.5mm, the length value range of the long pool absorption pool channel is 20-30cm, the length value range of the middle pool absorption pool channel is 10-15cm, and the length value range of the short pool absorption pool channel is 1-3cm; the buffer cell channel has an inner diameter in the range of 10-20mm and its inner surface is in a highly polished state of RA0.004m.
Optionally, the light source system includes a low-pressure mercury lamp light source, and the first detector and the second detector both adopt UV detectors.
Compared with the prior art, the cold atomic optical path absorption cell device for the mercury meter realizes three-absorption cell analysis by arranging the absorption cell system of a single flow path and by means of the long cell absorption cell channel, the middle cell absorption cell channel and the short cell absorption cell channel which are connected in series; furthermore, by utilizing two detectors, three-time spectrum absorption can be generated, the linear range is widened, and the ultra-low concentration, low concentration and common concentration content mercury can be analyzed simultaneously; meanwhile, the optical path control system is arranged, so that the optical path can be improved, the sensitivity is enhanced, the excellent detection limit is obtained, and the accurate analysis of the ultra-trace mercury element is realized.
Drawings
The utility model will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a cold atom optical path absorption cell device for mercury porosimetry according to an embodiment of the present utility model.
The reference numerals in the drawings illustrate:
1-a device body;
2-a light source system;
a 3-absorption cell system; 31-long pool absorption pool channels; 311—a vapor inlet; 32-a middle pond absorption pond channel; 33-short cell absorption cell channels; 331-an exhaust gas outlet; 34-buffer pool channels; 35-series channels; 351-a first series pass; 352-second series pass; 353-third series pass;
4-a detection system; 41-a first detector; 42-a second detector;
5-an optical path control system; 51-a lens assembly; 511-a focusing lens; 512-semi-transparent semi-reflective lens; 513-a total reflection lens;
6-a temperature control system; 61-heating rod; 62-thermocouple; 63-temperature controller.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
Fig. 1 shows a schematic structure of a preferred embodiment of the present utility model, in which a cold-atom optical path absorption cell device for mercury porosimetry comprises a device body 1, and a light source system 2, an absorption cell system 3 and a detection system 4 arranged in the device body 1,
the absorption cell system 3 comprises a long cell absorption cell channel 31, a middle cell absorption cell channel 32, a short cell absorption cell channel 33 and a buffer cell channel 34 arranged between the middle cell absorption cell channel 32 and the short cell absorption cell channel 33 which are connected end to end through a serial channel 35; the middle pool absorption pool channel 32 and the short pool absorption pool channel 33 are positioned on the same first optical path and are parallel to the second optical path where the long pool absorption pool channel 31 is positioned; wherein, the middle pool absorption pool channel 32 and the short pool absorption pool channel 33 on the same light path channel are divided into two absorption pools by the buffer pool channel 34;
the optical path control system 5 is further included, and the optical path control system 5 includes lens assemblies 51 disposed at two ends of the first optical path and the second optical path, and is used for focusing and redirecting light rays.
In a further alternative of the present embodiment, the detection system 4 includes a first detector 41 and a second detector 42 disposed at the ends of the first optical path and the second optical path, respectively.
In the figure, the arrow represents the path condition of the light source system 2 in the absorption cell system 3 and the light path control system 5, and the light finally enters the detection system 4 to realize the measurement of absorbance and complete mercury measurement. Specifically, after the divergent light of the light source system 2 is regulated by the light path control system 5, the parallel light in a focusing form enters a second light path where the long-tank absorption tank channel 31 is located, and at the same time, under the action of the light path control system 5, a part of the light is detected by the first detector 41, so that the first light intensity is weakened; another portion of the light continues to enter the first optical path where the middle and short cell absorber cell channels 32 and 33 are located under the influence of the optical path control system 5, and finally enters the second detector 42, and generates second and third light intensity reductions in the middle and short cell absorber cell channels 32 and 33 in sequence. Based on the detection principle that the light intensity weakening degree and a certain concentration are in linear relation, the analysis of ultralow concentration, low concentration and common concentration mercury content is realized by three times of spectral absorption. In the whole process, the light of the light source system 2 is optimally regulated by the lens component of the light path control system 5, for example, lens focusing, light path semi-transparent and semi-reflective or light path refracting effects are carried out, so that the light path is improved, the sensitivity is enhanced, the excellent detection limit is obtained, and the accurate analysis of the ultra-trace mercury elements is realized.
In a further alternative implementation of the present embodiment, the lens assembly 51 includes a focusing lens 511, a semi-transparent semi-reflective lens 512, and a total reflection lens 513; the focusing lens 511 is arranged between the light source system 2 and the head end of the long-cell absorption cell channel 31; the semi-transparent semi-reflective lens 512 is arranged between the end of the long cell absorption cell channel 31 and the first detector 41; the total reflection lens 513 is disposed at the head end of the cuvette channel 32 and aligned with the semi-transparent and semi-reflective lens 512.
The combined application of the transflective lens 512 and the total reflection lens 513 realizes that a plurality of absorption cells share a single light source, thereby reducing the cost. The use of the focusing lens 511 allows the light source intensity to be significantly increased, improving sensitivity.
In a further alternative implementation of the present embodiment, the transmittance and the reflectance of the transflective lens 512 are both 50%, and the transmittance of the total reflection lens 513 is 96%. To achieve a focused spot that conforms to the absorber channel inner diameter, the focusing lens 511 preferably selects an aspherical surface and a diffractive lens to produce a suitable focal spot.
In a further alternative of the present example, a temperature control system 6 is further included for bringing the absorption cell system 3 to a temperature in the range of 100-150 ℃; the temperature control system 6 comprises a heating rod 61 and a thermocouple 62 which are arranged in the device main body 1, and a temperature controller 63 which is arranged outside the device main body 1, wherein the temperature controller 63 is respectively connected with the heating rod 61 and the thermocouple 62 to form a temperature control loop.
The heating rod 61 is used as a heating member, mainly used for increasing the temperature, the thermocouple 62 is used as a temperature measuring member, mainly used for detecting the actual temperature of the environment in the device main body 1, and the temperature controller 63 regulates and controls the working condition of the heating rod 61 according to the actual temperature, so as to achieve the effect of circulating temperature control. The whole absorption tank system 3 is at the temperature controlled above 100 ℃, the preferable temperature range is 100-150 ℃, and the memory effect of mercury vapor can be eliminated.
In a further alternative implementation manner of the present embodiment, a vapor inlet 311 is provided at the side of the head end of the long-tank absorption tank channel 31; the short cell absorption cell channel 33 has a waste gas outlet 331 at one side of its end and another side of its end connected to one end of the buffer cell channel 34, and the other end of the buffer cell channel 34 is connected to the end of the middle cell absorption cell channel 32 at the same side.
Mercury vapor enters the absorption cell system 3 through the vapor inlet 311, flows through the long cell absorption cell channel 31, the first serial channel 351, the middle cell absorption cell channel 32, the second serial channel 352, the buffer cell channel 34, the third serial channel 353 and the short cell absorption cell channel 33 in sequence under the pushing of carrier gas, and finally is discharged through the exhaust gas outlet 331.
In a further alternative implementation manner of the present embodiment, the inner diameters of the long-tank absorption tank channel 31, the middle-tank absorption tank channel 32 and the short-tank absorption tank channel 33 are in a range of 0.5-2.5mm, the length of the long-tank absorption tank channel 31 is in a range of 20-30cm, the length of the middle-tank absorption tank channel 32 is in a range of 10-15cm, and the length of the short-tank absorption tank channel 33 is in a range of 1-3cm; the buffer reservoir channel 34 has an inner diameter in the range of 10-20mm and its inner surface is in a highly polished state of RA0.004m.
In terms of manufacturing materials, the absorption cell system 3 may be manufactured from an aluminium-type material, glass or quartz material. When the aluminum type material is selected, the prepared absorption tank system 3 has the advantages of easy processing, quick heat conduction and strong oxidation resistance.
In a further alternative of the present embodiment, the light source system 2 includes a low-pressure mercury lamp light source, and the first detector 41 and the second detector 42 each use a UV detector.
The light source 21 of the low-pressure mercury lamp is a market purchase device, and when the low-pressure mercury lamp works, the mercury vapor pressure in the lamp is smaller than one atmosphere, and the main radiation wavelength of mercury atoms is 253.65nm, namely the strongest sensitive line. The UV detector has the advantages of small volume, extremely strong selectivity to 253.65nm spectral line, capability of generating stronger absorbance and capability of meeting the requirement of accurate detection.
In specific application, divergent light of the low-pressure mercury lamp light source is processed by a focusing lens 511 to form focused parallel light which enters a long-tank absorption tank channel 31; then, under the action of the semi-transparent and semi-reflective lens 512: a portion of the light is detected by the first detector 41 and mercury vapor is absorbed by the resulting 253.65nm spectrum, resulting in a first intensity decay, the intensity decay being linear with concentration, corresponding to an ultra-low concentration mercury content analysis. The other part of the light is reflected to the total reflection lens 513, is refracted and enters the middle tank absorption tank channel 32 and the short tank absorption tank channel 33, at the moment, mercury vapor is pushed by carrier gas to sequentially enter the middle tank absorption tank channel 32 and enter the short tank absorption tank channel 33 after being buffered by the buffer tank channel 34, so that 253.65nm spectrum absorption of the middle tank and the short tank is sequentially generated, light intensity is respectively weakened for the second time and the third time, and the light intensity weakening degree is in linear relation with a certain concentration, namely, the analysis of mercury content with low concentration and ordinary concentration is corresponding.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, but any simple modification and equivalent variation of the above embodiment according to the technical spirit of the present utility model falls within the scope of the present utility model.
Claims (8)
1. The utility model provides a mercury porosimeter is with cold atomic optical path absorption cell device, includes the device main part and sets up light source system, absorption cell system and detecting system in the device main part, characterized by:
the absorption tank system comprises a long tank absorption tank channel, a middle tank absorption tank channel, a short tank absorption tank channel and a buffer tank channel arranged between the middle tank absorption tank channel and the short tank absorption tank channel which are connected end to end through a serial channel; the middle pool absorption pool channel and the short pool absorption pool channel are positioned on the same first optical path and are parallel to a second optical path where the long pool absorption pool channel is positioned;
the optical path control system comprises lens components arranged at two ends of the first optical path and the second optical path and is used for focusing and turning transmission of light rays.
2. The cold-atom-path-length absorption cell device for mercury porosimeter of claim 1, wherein: the detection system includes a first detector and a second detector disposed at ends of the first optical path and the second optical path, respectively.
3. The cold-atom-path-length absorption cell device for mercury porosimeter of claim 2, wherein: the lens assembly comprises a focusing lens, a semi-transparent semi-reflective lens and a total reflection lens; the focusing lens is arranged between the light source system and the head end of the long pool absorption pool channel; the semi-transparent semi-reflective lens is arranged between the tail end of the long-tank absorption tank channel and the first detector; the total reflection lens is arranged at the head end of the middle tank absorption tank channel and is aligned with the semi-transparent semi-reflective lens.
4. A cold atom optical path absorption cell device for mercury porosimetry according to claim 3, characterized in that: the transmittance and the reflectivity of the semi-transparent and semi-reflective lens are both 50%, and the transmittance of the total-reflective lens is more than or equal to 96%.
5. A cold atom optical path absorption cell device for mercury porosimetry according to claim 2 or 3 or 4, characterized in that: the system also comprises a temperature control system for enabling the absorption tank system to be in a temperature range of 100-150 ℃; the temperature control system comprises a heating rod, a thermocouple and a temperature controller, wherein the heating rod and the thermocouple are arranged in the device main body, and the temperature controller is arranged outside the device main body and is respectively connected with the heating rod and the thermocouple to form a temperature control loop.
6. The cold atomic path absorption cell device for mercury porosimetry according to claim 5, wherein: the side part of the head end of the long pool absorption pool channel is provided with a steam inlet; and one side part of the tail end of the short pool absorption pool channel is provided with an exhaust gas outlet, the other side part of the tail end of the short pool absorption pool channel is connected with one end of the buffer pool channel, and the other end of the buffer pool channel is connected with the tail end of the middle pool absorption pool channel at the same side.
7. The cold-atom-path-length absorption cell device for mercury porosimeter of claim 6, wherein: the inner diameter size range of the long pool absorption pool channel, the middle pool absorption pool channel and the short pool absorption pool channel is 0.5-2.5mm, the length value range of the long pool absorption pool channel is 20-30cm, the length value range of the middle pool absorption pool channel is 10-15cm, and the length value range of the short pool absorption pool channel is 1-3cm; the inner diameter of the buffer pool channel is 10-20mm, and the inner surface is in a highly smooth state with RA less than or equal to 0.004 mu m.
8. The cold-atom-path-length absorption cell device for mercury porosimeter of claim 7, wherein: the light source system comprises a low-pressure mercury lamp light source, and the first detector and the second detector both adopt UV detectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320887918.7U CN219675816U (en) | 2023-04-19 | 2023-04-19 | Cold atom optical path absorption cell device for mercury detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320887918.7U CN219675816U (en) | 2023-04-19 | 2023-04-19 | Cold atom optical path absorption cell device for mercury detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219675816U true CN219675816U (en) | 2023-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320887918.7U Active CN219675816U (en) | 2023-04-19 | 2023-04-19 | Cold atom optical path absorption cell device for mercury detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219675816U (en) |
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2023
- 2023-04-19 CN CN202320887918.7U patent/CN219675816U/en active Active
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