CN219657552U - Semi-permeable membrane humidifying device of LA-ICP-MS - Google Patents
Semi-permeable membrane humidifying device of LA-ICP-MS Download PDFInfo
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- CN219657552U CN219657552U CN202320687898.9U CN202320687898U CN219657552U CN 219657552 U CN219657552 U CN 219657552U CN 202320687898 U CN202320687898 U CN 202320687898U CN 219657552 U CN219657552 U CN 219657552U
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- semipermeable membrane
- pipeline
- humidifying
- deionized water
- gas
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- 239000012528 membrane Substances 0.000 title claims abstract description 48
- 238000000095 laser ablation inductively coupled plasma mass spectrometry Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000008367 deionised water Substances 0.000 claims abstract description 23
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 19
- 239000000443 aerosol Substances 0.000 abstract description 17
- 238000004458 analytical method Methods 0.000 description 19
- 239000007789 gas Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 15
- 239000011159 matrix material Substances 0.000 description 14
- 239000012159 carrier gas Substances 0.000 description 13
- 238000002679 ablation Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000000608 laser ablation Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009616 inductively coupled plasma Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910021654 trace metal Inorganic materials 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The utility model discloses a semipermeable membrane humidifying device of LA-ICP-MS, which comprises a deionized water tank, a gas humidifying pipeline and a heating sleeve; two ends of the gas humidification pipeline are connected with a sampling gas circuit of the LA-ICP-MS; at least one part of the gas humidifying pipeline is a hollow semi-permeable membrane pipeline, the hollow semi-permeable membrane pipeline is arranged in a deionized water tank, the deionized water tank is used for storing deionized water for humidifying, and the heating sleeve is used for heating the deionized water tank at constant temperature; the hollow semipermeable membrane pipeline is made of a semipermeable membrane allowing water molecules to pass through. The step of adding water vapor is adjusted to be carried out after the generation of the degraded aerosol particles, and on the other hand, in order to avoid sample pollution, a semipermeable membrane is adopted to ensure that only water molecules can pass through, so that the problems in the background art are solved.
Description
Technical Field
The utility model belongs to the technical field of laser ablation, and particularly relates to a semipermeable membrane humidifying device of LA-ICP-MS.
Background
With the gradual maturation of a laser ablation system, a laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is used as a solid direct sample injection and micro-area analysis technology, is widely applied to the fields of geology, environment, biology, materials, industrial product detection and the like, and can analyze major, trace and ultra trace elements, and has great advantages in the aspects of rare earth elements, PGEs, isotope analysis and the like. The principle of the conventional laser ablation inductively coupled plasma mass spectrometry is shown in fig. 1, a laser 1 emits a laser beam 1-1 to the surface of a sample 2 for ablation, a carrier gas 3 is introduced and aerosol particles (i.e., carrier gas and aerosol particles 3-1) generated by the ablation are carried away, and the carrier gas and aerosol particles are transmitted to an ICP-MS apparatus together for analysis. However, the matrix effect and the fractional effect of the elements commonly present are important factors affecting the accuracy and precision of the analysis results.
In the prior art, as shown in fig. 2, carrier gas and water vapor 4 are introduced into a laser ablation pool together, aerosol particles generated by laser beam ablation are transmitted to an inductively coupled plasma mass spectrometer together with the introduced carrier gas and water vapor (namely carrier gas, water vapor and aerosol particles 4-1) for analysis, so that the matrix effect in UPb age analysis among different accessory minerals is eliminated.
In the prior art, a device for introducing steam into a gas circuit is disclosed as follows: CN105194782a patent, "mini humidifier", which comprises an atomizing chamber with heating function and an atomizing plate for separating the air path, and atomized water drops and water vapor are directly introduced into the air path by the vibration of the atomizing plate.
However, the method also brings some technical difficulties:
1. the evaporation capacity of the water vapor is unstable and uncontrollable;
2. the sample cell is polluted by the residual aerosol particles generated by the ablation;
in the operation process, carrier gas and water vapor are introduced into the laser ablation pool together, so that sample particles generated by laser ablation can remain in the sample pool due to the existence of the water vapor, the sample pool is polluted, and the subsequent detection result is inaccurate;
3. the degradation produces aerosol particles that remain in the sample cell resulting in a lower sample volume that ultimately enters the inductively coupled plasma mass spectrometer, resulting in inaccurate analysis results.
Therefore, how to reduce the matrix effect during analysis to ensure the analysis test accuracy is a problem to be solved.
Disclosure of Invention
In view of the above, it is an object of the present utility model to provide a semipermeable membrane humidifying device of LA-ICPMS, in which the step of adding water vapor is adjusted to be performed after generating degraded aerosol particles, and in which only water molecules can pass through by using a semipermeable membrane to avoid sample contamination, thereby solving the problems set forth in the background art.
In order to achieve the above object, a first aspect of the present utility model provides a semipermeable membrane humidifying device of LA-ICPMS, which is characterized by comprising a deionized water tank, a gas humidifying pipeline and a heating jacket;
two ends of the gas humidification pipeline are connected with a sampling gas circuit of the LA-ICPMS; at least one part of the gas humidifying pipeline is a hollow semi-permeable membrane pipeline, the hollow semi-permeable membrane pipeline is arranged in a deionized water tank, the deionized water tank is used for storing deionized water for humidifying, and the heating sleeve is used for heating the deionized water tank at constant temperature;
the hollow semipermeable membrane pipeline is made of a semipermeable membrane allowing water molecules to pass through.
Preferably, the gas humidification device further comprises a humidity detector, wherein the humidity detector is used for detecting the humidity of the gas passing through the gas humidification pipeline.
Preferably, the length of the hollow semipermeable membrane pipeline is 1-10cm.
Preferably, the material of the hollow semi-permeable membrane pipeline is an ePTFE membrane.
Preferably, the heating sleeve is a graphite heating sleeve or a metal heating sleeve.
Preferably, the heating range of the heating jacket is 20-50 ℃.
In another aspect, the present utility model provides a use of a semipermeable membrane humidification device as described above for reducing the matrix effect of a sample.
In another aspect, the utility model provides an application of the semipermeable membrane humidifying device in cleaning a sample injection system, wherein the sample injection system comprises an atomizer, a torch tube central tube and an interface cone tip.
The beneficial effects of the utility model are as follows:
1) The instability of the evaporation capacity of the water vapor is reduced, the water adding quantity is controllable, and the water adding quantity can be monitored in real time;
2) Reducing pollution of a sample cell, introducing water vapor into an ablation cell before laser ablation, and removing particles remained in the sample cell due to the action of the water vapor, so that the sample cell is polluted and the subsequent analysis is influenced;
3) The accuracy and precision of analysis are improved, water is added into a transmission pipeline between the degraded samples and the inductively coupled plasma mass spectrometer, so that the problem that degraded samples do not completely enter ICP-MS due to sample retention sample pools caused by water vapor in carrier gas is eliminated, and the accuracy and precision of analysis are improved;
4) Because the water gas has a cleaning effect on the system, instrument drift caused by sediment accumulated in a sample injection system (usually an atomizer, a central tube of a torch tube and an interface cone tip) is reduced;
5) The matrix effect during analysis is reduced, and the long-term stability of detection is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional laser ablation inductively coupled plasma mass spectrometry;
FIG. 2 is a schematic diagram of a prior art method for reducing matrix effects;
fig. 3 is a schematic diagram of a semipermeable membrane humidifying device of LA-ICP-MS disclosed in an embodiment of the utility model;
fig. 4 is a schematic structural diagram of a semipermeable membrane humidifying device according to an embodiment of the present utility model;
FIG. 5 is a schematic illustration of the detection of a comparative matrix effect for a mineral according to an embodiment of the present utility model;
wherein:
1 a laser; 1-1 laser beam; 2 sample; 3, carrying gas; 3-1 carrier gas and aerosol particles; 4 carrier gas and water vapor; 4-1 carrier gas, water vapor and aerosol particles; 5 a semipermeable membrane humidifying device; 5-1 hollow semipermeable membrane pipeline; 5-2 deionized water tanks; 5-3 heating jackets; 5-4 humidity detector; 5-5 gas humidification pipelines; 5-6 tee joint.
Detailed Description
One of the cores of the present utility model is to provide a semipermeable membrane humidifying device of LA-ICP-MS, which adjusts the step of adding water vapor to be performed after generating degraded aerosol particles, and on the other hand, to avoid sample contamination, adopts a semipermeable membrane to ensure that only water molecules can pass through, thereby solving the problems set forth in the background art.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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 be within the scope of the utility model.
Fig. 3 shows the principle of a semipermeable membrane humidifying device of LA-ICP-MS according to the embodiment of the present utility model, after aerosol particles (i.e. carrier gas and aerosol particles 3-1) degraded by laser enter a sampling pipeline, the aerosol particles are humidified, and after humidification (i.e. carrier gas, water vapor and aerosol particles 4-1), the aerosol particles are sent to ICP-MS for analysis. The embodiment simplifies and automates complex pretreatment process, improves working efficiency, is suitable for samples with strong matrix effect, such as analysis on the high-purity high-matrix grinding fluid construction, and also realizes water adding controllability, reduces matrix effect and instrument drift during analysis, reduces pollution of a sample pool, improves analysis accuracy and precision, and obviously improves long-term stability of detection.
FIG. 4 shows a structure of a semipermeable membrane humidifying device 5 of LA-ICP-MS disclosed in the embodiment of the utility model, which comprises a deionized water tank 5-2 and a gas humidifying pipeline 5-5, wherein the deionized water tank 5-2 comprises a main body part and a cover body arranged above the main body part for adding and replacing deionized water, the cover body is in sealing connection with the main body part, the gas humidifying pipeline 5-5 is fixedly connected with a cover body of the deionized water tank and is connected with an air circuit of an ablation sampling device, the middle section of the gas humidifying pipeline 5-5 is arranged in the deionized water tank, and the middle section of the gas humidifying pipeline 5-5 comprises a hollow semipermeable membrane pipe 5-1; the hollow semipermeable membrane tube 5-1 used in this embodiment only water molecules can pass through the wall of the membrane, preferably, the length of the hollow semipermeable membrane tube 5-1 is 1-10cm, and the material is polytetrafluoroethylene microporous membrane (ePTFE). When the humidifying device works, the hollow semi-permeable membrane tube 5-1 is immersed in deionized water, and vapor pressure at a certain temperature balances vapor pressure of water molecules to evaporate through the semi-permeable membrane and enter a gas phase, so that a humidifying effect is achieved. The deionized water tank 5-2 is placed in an intelligent graphite heater or a metal heater with a base with accurate temperature control, and the heating range is preferably 20-50 ℃. The outlet of the gas humidifying pipeline 5-5 is provided with a three-way interface 5-6, one of which is directly connected to an air inlet pipe of the inductively coupled plasma mass spectrometer for analysis; the other end is connected with a valve, the valve is connected with a humidity detector 5-4 for detecting the gas humidity of the gas circuit so as to know the water adding condition, and the valve can be directly closed when the water adding condition is not detected. The device can not only realize reliable and accurate water addition and reduce matrix effect, but also avoid the conditions of sample cell pollution and inaccurate analysis result caused by introducing water vapor before denudation.
Fig. 5 is a graph showing the influence of LA-ICP-MS on the matrix effect of trace metal elements in a mineral sample, wherein solid points indicate that the sample is humidified after sampling, hollow points are not humidified, and two groups of samples are continuously detected 125 times, so that the repeatability of the humidified sample signal is obviously better than that of the non-humidified sample, and the influence of the matrix effect on the repeatability is greater and greater along with the continuous detection in the non-humidified experimental method, which is probably caused by the fact that the sample matrix remains in a sample injection system (an atomizer, a central tube of a torch tube and an interface cone tip).
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The semipermeable membrane humidifying device of the LA-ICP-MS is characterized by comprising a deionized water tank, a gas humidifying pipeline and a heating sleeve;
two ends of the gas humidification pipeline are connected with a sampling gas circuit of the LA-ICP-MS; at least one part of the gas humidifying pipeline is a hollow semi-permeable membrane pipeline, the hollow semi-permeable membrane pipeline is arranged in a deionized water tank, the deionized water tank is used for storing deionized water for humidifying, and the heating sleeve is used for heating the deionized water tank at constant temperature;
the hollow semipermeable membrane pipeline is made of a semipermeable membrane allowing water molecules to pass through.
2. The semipermeable membrane humidifying apparatus according to claim 1, further comprising a humidity detector for detecting humidity of the gas passing through the gas humidifying pipe.
3. The semipermeable membrane humidifying apparatus according to claim 1, wherein the length of the hollow semipermeable membrane piping is 1-10cm.
4. The semipermeable membrane humidifying apparatus according to claim 1, wherein the hollow semipermeable membrane tube is made of ePTFE membrane.
5. The semipermeable membrane humidifying apparatus according to claim 1, wherein the heating jacket is a graphite heating jacket or a metal heating jacket.
6. The semipermeable membrane humidifying apparatus according to claim 1, wherein the heating range of the heating jacket is 20 to 50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320687898.9U CN219657552U (en) | 2023-03-31 | 2023-03-31 | Semi-permeable membrane humidifying device of LA-ICP-MS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320687898.9U CN219657552U (en) | 2023-03-31 | 2023-03-31 | Semi-permeable membrane humidifying device of LA-ICP-MS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657552U true CN219657552U (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320687898.9U Active CN219657552U (en) | 2023-03-31 | 2023-03-31 | Semi-permeable membrane humidifying device of LA-ICP-MS |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657552U (en) |
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2023
- 2023-03-31 CN CN202320687898.9U patent/CN219657552U/en active Active
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