CN107305168B - Gaseous mercury catches mercury device - Google Patents
Gaseous mercury catches mercury device Download PDFInfo
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- CN107305168B CN107305168B CN201610258492.3A CN201610258492A CN107305168B CN 107305168 B CN107305168 B CN 107305168B CN 201610258492 A CN201610258492 A CN 201610258492A CN 107305168 B CN107305168 B CN 107305168B
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- G01N1/00—Sampling; Preparing specimens for investigation
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Abstract
The gaseous mercury trapping device comprises a tube body and a gold wire arranged on the tube body through a limiting support body, wherein the melting point of the limiting support body is higher than that of the gold wire, and the limiting support body is constructed to enable the gaseous mercury to be in contact with the gold wire so that the gold wire can adsorb the gaseous mercury. The possibility that the density of each part is changed due to the deformation of the gold wire can be controlled, and the density of each part of the gold wire is consistent, so that the adsorption and release capacity of the gaseous mercury capture device on mercury after being used for multiple times can be ensured, and the use times of the mercury capture device can be further improved; the reproducibility is good, the analysis data is real and reliable, and the reliability of geological interpretation is improved; and the volume is small, and the carrying is convenient.
Description
Technical Field
The invention relates to the technical field of mercury capture devices, in particular to an improved structure of a gaseous mercury capture device.
Background
The current collection technology of soil gas mercury and mercury in the atmosphere applied to geochemical exploration mainly comprises the steps of capturing (enriching) mercury, and completely releasing the mercury in the captured (enriched) mercury through a chemical or heating mode for instrument measurement. Conventionally, mercury capture has been carried out by using a mercury capture device. The mercury trap is provided with gold wires, gold amalgam is formed by adsorbing gaseous mercury by using gold, then the mercury trap is heated at high temperature to release mercury, and then instrumental determination is carried out.
The mercury capturing device comprises a tube body and a gold wire arranged in the tube body. The middle part of the tube body is provided with a tube section which is thinner relative to the two sides, and a gold wire group formed by the gold wire group is arranged in the thinner tube section of the tube body in a plugging way. However, after the mercury capture device is used for several times, the gold wire group is easy to shrink and shake, the adsorption capacity of the mercury capture device on gaseous mercury is reduced, and uncertain factors are easy to generate on analysis data of mercury.
Therefore, how to solve the problem that the adsorption capacity of the existing mercury trap for gaseous mercury is reduced after being used for several times is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a gaseous mercury capturing device, wherein a gold wire is arranged in a tube body through a limiting support body, so that the possibility of influencing the adsorption capacity of the gaseous mercury due to shaking caused by deformation and shrinkage of the gold wire is reduced, and the use times of the gaseous mercury capturing device is increased.
The gaseous mercury capture device comprises a tube body and a gold wire arranged on the tube body through a limiting support body, wherein the melting point of the limiting support body is higher than that of the gold wire, and the limiting support body is configured to enable the gaseous mercury to be in full contact with the gold wire, so that the gold wire can adsorb the gaseous mercury.
In one embodiment, the limiting support body comprises a metal mesh which is woven by a plurality of metal wires with melting points higher than that of the gold wires and provided with gaps, wherein the metal mesh is abutted and fixed in the pipe body along an axial direction perpendicular to the pipe body, and the gold wires are fixed on the metal mesh.
In one embodiment, a plurality of the metal wires are interlaced in at least two directions to form the metal mesh, and the outer side of the metal mesh is provided with a metal ring capable of abutting against the tube body wall of the tube body to be fixed in the tube body.
In one embodiment, a plurality of said gold wires are provided, wherein each gold wire is wound around a different said metal wire, and wherein said gold wires are not wound around the outermost metal loops of said metal mesh.
In one embodiment, each of the gold wires is woven in the metal mesh in a spaced manner with the metal wire, and each of the gold wires is separated from the outermost metal ring of the metal mesh.
In one embodiment, a plurality of the gold wires are arranged, and are vertically and horizontally woven into a gold wire net which is fixed on one side of the metal net.
In one embodiment, a plurality of the metal meshes are arranged along the axial direction of the pipe body, wherein a gold wire group composed of the gold wires is filled between two adjacent metal meshes.
In one embodiment, a plurality of the metal meshes are arranged along the axial direction of the pipe body, wherein the metal mesh is arranged on each metal mesh, and the gap of the metal mesh positioned on the upstream of the pipe body is larger than that of the metal mesh positioned on the downstream of the pipe body.
In one embodiment, the metal wire is a tungsten wire, and the diameter of a tungsten wire mesh woven by the tungsten wire is the same as the inner diameter of a pipe section of the pipe body for arranging the tungsten wire mesh.
In one embodiment, the two sides of the pipe body are sleeved with plastic sealing pipes for sealing the inside of the pipe body.
Compared with the prior art, the gaseous mercury trapping device comprises the tube body and the limiting support body arranged in the tube body, wherein the gold wire is arranged on the limiting support body, and the melting point of the limiting support body is higher than that of the gold wire. Therefore, the possibility of density change at each position caused by gold wire deformation can be controlled, and the density at each position of the gold wire is consistent (the density is approximately the same as the density at the position before the gaseous mercury capture device is not used), so that the mercury adsorption and release capacity of the gaseous mercury capture device after being used for multiple times can be ensured, and the use times of the mercury capture device can be further improved; the reproducibility is good, the analysis data is real and reliable, and the reliability of geological interpretation is improved; and the volume is small, and the carrying is convenient.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a gaseous mercury capture device of the present invention.
Fig. 2 shows a first embodiment of the gold wire arrangement of the present invention.
Fig. 3 shows a second embodiment of the gold wire arrangement of the present invention.
Fig. 4 shows a third embodiment of the gold wire arrangement of the present invention.
Fig. 5 is a partial schematic view of fig. 1.
Fig. 6 is a table of the operating curves for saturated mercury vapor in accordance with the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the gaseous mercury trapping device of the present invention comprises a tube body 3 and a gold wire 2 disposed in the tube body 3 and supported by a spacing support. Wherein, after being provided with spacing supporter, gaseous mercury still can with the 2 contacts of gold wire to make gold wire 2 can adsorb gaseous mercury, thereby can accomplish the measurement to gaseous mercury. And the melting point of the limiting support body is higher than that of the gold wire 2. Therefore, when the mercury is desorbed at high temperature, the gold wire 2 in a high-temperature environment can still be limited and supported by the limiting support body after being softened, the possibility of deformation and displacement of the gold wire 2 is reduced, the possibility that part of the pipe body 3 is free of the gold wire 2 is reduced, and the consistency of the density of each part of the gold wire 2 is ensured (the consistency is approximately the same as the state before the gaseous mercury capturing device is not used), so that the adsorption and release capacity of the gaseous mercury capturing device on mercury after being used for multiple times can be ensured, and the use times of the mercury capturing device is further improved.
As shown in fig. 2, the position limiting support body comprises a metal net 1 woven by a plurality of metal wires. In the case of weaving the metal mesh 1, the metal mesh 1 may be generally woven by a plurality of metal wires crossing each other in at least two directions, for example, by a plurality of metal wires being woven alternately in both longitudinal and transverse directions. After the metal mesh 1 is arranged, a gap is reserved between two adjacent metal wires, namely a certain gap is reserved between two adjacent metal wires along the same direction, so that gaseous mercury can contact the metal wires 2 through the metal wires, and the adsorption of the metal wires 2 on the gaseous mercury is realized.
When the expanded metal 1 is placed in the tubular body 3, the expanded metal 1 is arranged in the tubular body 3 in an axial direction substantially perpendicular to the tubular body 3, i.e. the plane of the expanded metal 1 is substantially perpendicular to the axis of the tubular body 3. When setting up metal mesh 1, directly push away metal mesh 1 and establish to body 3 in, the outside of metal mesh 1 supports with body 3 and establishes and fix in body 3. Because metal mesh 1 is established by the wire and is formed, consequently metal mesh 1 has certain elasticity, and when placing metal mesh 1 in body 3, the frictional force between wire and body 3 is great, consequently directly can realize metal mesh 1 and fix in body 3 after placing metal mesh 1 in body 3, when adsorbing gaseous mercury, metal mesh 1 also can not produce and rock, and is fixed relatively firm. Through the arrangement of the mode, the structure is simple, metal with low material cost can be used, the fixing of the gold wire 2 can be realized, and the possibility of shrinkage deformation of the gold wire 2 in the using process is reduced.
Further, the outside of metal mesh 1 can set up at least the round and enclose the metal loop 11 who establishes and form by the wire, and metal mesh 1 contacts and fixes in body 3 through the tube body wall of metal loop 11 with body 3 to improve the degree of contact between metal mesh 1 and the body 3, improve metal mesh 1's fixed fastness. The metal wire can be tungsten wire or other metal wire with burning point higher than gold, and the metal mesh 1 is a tungsten wire mesh. The ductility of the tungsten filament is good, the cost is low, the melting point is higher than 1000 ℃ (the gold amalgam can be desorbed approximately below 900 ℃), the possibility of tungsten filament melting deformation is reduced, the adsorption and release performance of the gold wire 2 on gaseous mercury is ensured, the data analysis accuracy is ensured, and the use times of the gaseous mercury capture device is improved.
The gold wires 2 may be fixed to the metal net 1 in various ways. In the first embodiment, as shown in fig. 2, a plurality of gold wires 2 are provided on a metal mesh 1. When the gold wires 2 are arranged, the gold wires 2 can be wound on different metal wires, and then the metal wires are woven into the metal net 1. After the metal mesh 1 and the gold wires 2 are arranged, the intervals between two adjacent gold wires 2 are approximately the same, so that the adsorption capacity of the mercury gas is improved. After the gold wire 2 is wound around the metal wire, the gold wire loops on the same metal wire can be closely attached to each other without providing a gap (not shown) to increase the amount of the gold wire 2 to be disposed. Through the above mode setting, can improve the adsorption degree to gaseous mercury, improve the monitoring accuracy, can reduce the possibility that gold wire 2 takes place to warp moreover, improve the number of times of use of catching the mercury device. Of course, a certain gap (as shown in fig. 2) may be left between the gold wire 2 loops to reduce the bearing capacity of the metal wire.
Further, the metal ring 11 at the outermost side of the metal net 1 can be not wound with the gold wire 2, so that when the metal net 1 is arranged in the pipe body 3, the metal wire can be contacted with the wall of the pipe body 3, the possibility of the contact of the gold wire 2 and the wall of the pipe body 3 is reduced, and the possibility of the metal net 1 shaking or even falling off caused by the reduction of friction between the gold wire 2 and the wall of the pipe body 3 due to softening is reduced.
The diameter of the wire may be larger than the diameter of the gold wire 2 so that the wire is better able to carry the gold wire 2, reducing the likelihood of deformation under the weight of the gold wire 2. In one example, the wire has a diameter of between about 0.6 mm and about 1mm to better carry the weight of the wire 2 while reducing the weight of the wire.
The inner diameters of the pipe body 3 can be the same, so that the pipe body 3 can be conveniently processed, and the processing cost is reduced. The tube body 3 may be made of a quartz tube to be resistant to high temperature (e.g., 1000 ℃). A plurality of metal nets 1 (more than four) wound with gold wires 2 can be arranged along the axial direction of the tube body 3, so that the adsorption capacity of the gaseous mercury is improved, and the defect that gaps among the gold wires 2 are enlarged due to the arrangement of the metal nets 1 can be overcome; the adsorption rate can even reach more than 98 percent, the experimental accuracy is improved, the reproducibility is good, the analysis data is real and reliable, and the reliability of geological interpretation is improved. The gap of the metal net 1 positioned at the upstream (the position where the gaseous mercury firstly passes through) of the pipe body 3 is smaller than the gap of the metal net 1 positioned at the downstream (the position where the gaseous mercury passes through) of the pipe body 3, so that the weight of the mercury catching device is reduced, the cost is reduced, and the carrying and the transportation are convenient.
In addition, a gold wire 2 group can be arranged between two adjacent metal nets 1, and the gold wire 2 group is fixed through the metal nets 1, so that the adsorption performance of the gaseous mercury is further improved, the analysis accuracy of the gaseous mercury is improved, and reliable data analysis is provided for oil-gas geochemical exploration, environmental investigation and the like.
In addition, plastic sealing pipes for sealing the inside of the pipe body 3 may be respectively sleeved on both sides of the pipe body 3. When the gaseous mercury capture device is used, the plastic sealing pipe can be taken down, and when the gaseous mercury capture device is not used, the plastic sealing pipe can be sleeved on the pipe body 3, so that the possibility of pollution of the mercury capture device is reduced.
In a second embodiment, as shown in fig. 3, a gold wire 2 is woven in a metal mesh 1, and the gold wire 2 is spaced apart from the metal wire. In one example, one gold wire 2 is disposed between every two metal wires in the transverse direction, and one gold wire 2 is also disposed between no two metal wires in the longitudinal direction. So set up, simple structure, it is convenient to set up labour saving and time saving. Of course, at this time, a circle of metal ring 11 may be disposed outside the metal net 1, and the metal ring 11 is separated from the metal wire 2, so that the metal wire contacts with the wall of the pipe body 3, and the stability is improved. Other arrangements in this embodiment may be the same as those in the above embodiment, and are not described herein again.
In the third embodiment, as shown in fig. 4, a plurality of gold wires 2 are woven into a gold wire mesh in both the vertical and horizontal directions. Then the gold wire mesh is fixed with the metal mesh 1. For example, a connection point for fixedly connecting the gold wire mesh to the metal mesh 1 may be provided at a distance. So set up, can improve the density of gold wire 2 on the cross section of body 3, improve the adsorption degree of single 2 nets of gold wire to gaseous state mercury. Other arrangements in this embodiment may be the same as those in the above embodiment, and are not described herein again.
In other embodiments, as shown in fig. 1 and 5, the metal meshes 1 are not provided with the gold wires 2, and only the gold wire 2 clusters are provided between two adjacent metal meshes 1. So set up, can make the clearance of the clearance setting of metal mesh 1 than the metal mesh 1 of above-mentioned embodiment great, reduce the influence of metal mesh 1 to spun gold 2, simple structure sets up swiftly moreover, and it is laborsaving to save trouble. Other arrangements in this embodiment may be the same as those in the above embodiment, and are not described herein again. The diameter H1 of the wire may be between 0.8 and 1 mm. The gap H2 between two adjacent wire meshes 1 may be between 2-4mm to improve the stability of the gold wire mass.
In a specific experiment, the adsorption rate was determined using the gaseous mercury trap at 80ul of mercury standard gas injected by a micro-syringe at the same temperature. The concentration of saturated mercury vapor was 16.87ng/ml at 23 deg.C, and the theoretical mercury content of 80ul saturated mercury vapor was 1.3496ng at 23 deg.C. From the data detected, the recovery rate of the gaseous mercury capture device was above 98%, and the results of the post-adsorption mercury capture device were close to the blank value, which indicated that the mercury capture device was relatively complete in mercury adsorption and that the adsorption reproducibility was relatively good (see table 1, which is a saturated mercury vapor recovery test, where ng represents nanograms).
| Pipe number | 6 | 7 | 8 | 9 | 10 |
| Sample volume (μ l) | Post-adsorption | 80 | 80 | 80 | 80 |
| Peak value | 0.0067 | 0.0698 | 0.0768 | 0.0690 | 0.0708 |
| ng | 0.1289 | 1.3502 | 1.4865 | 1.3346 | 1.3696 |
| Recovery (%) | 100.04 | 110.14 | 98.89 | 101.48 |
In another experiment, measurements of gaseous mercury capture devices injected with 0 μ l, 20 μ l, 40, 60 μ l, 80 μ l, and 100 μ l of saturated mercury vapor in different gaseous mercury capture devices resulted in different mercury content values as shown in table 2 and fig. 6 (table 2 is a saturated mercury vapor operating curve table, where ng in table 2 and fig. 6 represents nanograms, and the abscissa in fig. 6 represents the volume of saturated mercury vapor injected, μ l).
| |
0 | 1 | 2 | 3 | 4 | 5 |
| Sample volume (μ l) | 0 | 20 | 40 | 60 | 80 | 100 |
| Peak value | 0.00000 | 0.01869 | 0.03425 | 0.05368 | 0.06900 | 0.08680 |
| ng | 0.0000 | 0.3598 | 0.6604 | 1.0369 | 1.3346 | 1.6816 |
The gaseous mercury trapping device effectively controls the phenomenon of drooping deformation of the gold wire 2 and ensures the ventilation uniformity. The design of the multilayer adsorption net ensures that mercury in a gas state is completely adsorbed. The processed 50 specially manufactured mercury capturing devices are subjected to random spot check adsorption experiments, the adsorption rate is over 98 percent, and the mercury capturing tube has good adsorption effect, consistent reproducibility, very stable detection effect and real and reliable analysis data and improves the reliability of geological interpretation by analyzing 320 soil gas mercury in Hebei Bazhou region.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. A gaseous mercury capture device comprising a tube body and a gold wire disposed at the tube body by a spacing support, wherein the spacing support has a melting point higher than that of the gold wire and is configured to enable the gaseous mercury to contact the gold wire to enable the gold wire to adsorb the gaseous mercury;
the limiting support body comprises a metal net which is formed by weaving a plurality of metal wires with the melting points higher than that of the gold wires and provided with gaps, wherein the metal net is supported and fixed in the pipe body along the axial direction perpendicular to the pipe body, and the gold wires are fixed on the metal net.
2. The gaseous mercury capture device of claim 1, wherein a plurality of the wires are woven into the metal mesh in at least two staggered directions, and wherein the metal mesh is provided on an outer side with a metal ring that can abut against a tube body wall of the tube body to be secured in the tube body.
3. The gaseous mercury capture device of claim 1, wherein a plurality of gold wires are provided, wherein each gold wire is wrapped around a different one of the metal wires, and wherein the gold wire is not wrapped around an outermost metal loop of the metal mesh.
4. The gaseous mercury capture device of claim 1, wherein each gold wire is woven in the metal mesh at intervals from the metal wire, and each gold wire is separated from an outermost metal loop of the metal mesh.
5. The gaseous mercury capture device of claim 1, wherein a plurality of gold wires are provided, and are woven longitudinally and transversely into a gold wire mesh, the gold wire mesh being fixed to one side of the metal mesh.
6. The gaseous mercury capture device of claim 1, wherein a plurality of metal meshes are arranged along the axial direction of the tube body, wherein the metal meshes are provided with the gold wires, and the gap of the metal mesh located upstream of the tube body is larger than the gap of the metal mesh located downstream of the tube body.
7. The gaseous mercury capture device of claim 1, wherein the metal wires are tungsten wires, and the diameter of the tungsten wire mesh woven with the tungsten wires is the same as the inner diameter of the pipe section of the pipe body in which the tungsten wire mesh is arranged.
8. The gaseous mercury capture device of claim 1, wherein plastic sealing tubes for sealing the interior of the tube body are sleeved on both sides of the tube body.
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| CN108414297B (en) * | 2018-05-03 | 2019-11-08 | 大连理工大学 | A kind of collection device of Gaseous Detonation method nano materials |
| CN110864946A (en) * | 2019-11-13 | 2020-03-06 | 清华大学 | Device and method for measuring mercury content in flue gas |
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| CN1044533A (en) * | 1989-01-26 | 1990-08-08 | 甘肃有色金属地质研究所 | A kind of method for making of catching mercury demercuration device |
| CN203572711U (en) * | 2013-11-28 | 2014-04-30 | 北京雪迪龙科技股份有限公司 | Hg enriching device and Hg monitoring system |
| CN204128855U (en) * | 2014-09-17 | 2015-01-28 | 力合科技（湖南）股份有限公司 | A kind of capturing device and trapping system |
| CN104749018B (en) * | 2015-04-15 | 2017-05-31 | 武汉上谱分析科技有限责任公司 | A kind of laser ablation signal removes mercury device online |
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