Metallic mercury detection system
By designing a metal mercury detection system including a metal trap, a protective gas source and a metal detector, the problem of insufficient lower limit of mercury element detection and low signal-to-noise ratio in the prior art is solved, and efficient detection of low-concentration mercury samples is achieved.
Patent Information
- Application Number
- CN202421628561.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The existing metal mercury detection equipment does not have enough lower detection limit for mercury elements, and the signal-to-noise ratio is low, making it difficult to effectively detect low concentrations of mercury samples.
A metal mercury detection system is designed, including a metal trap, a protective gas source and a metal detector. The system operates in three states: the first state captures mercury elements, heats them in the second state to form mercury vapor, and in the third state, the protective gas source is used to quickly blow mercury vapor into the metal detector to improve the signal-to-noise ratio.
By increasing the signal-to-noise ratio of mercury, the detection capability of metal detectors is enhanced, and low concentrations of mercury samples can be detected more accurately.
Smart Images
Figure CN222913485U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal detection equipment, in particular to a metal mercury detection system. Background Art
[0002] Mercury is a highly toxic heavy metal. Therefore, the mercury content in foods, cosmetics, soil, etc. needs to be strictly controlled. The existing methods for determining metallic mercury mainly include hydride generation atomic fluorescence spectrometry, cold vapor atomic absorption spectrometry, inductively coupled plasma mass spectrometry, etc. When detecting low-concentration samples, the above detection methods usually have problems such as a slow process of element release and a low signal-to-noise ratio. Summary of the Utility Model
[0003] The utility model provides a metal mercury detection system, aiming to solve the problems of insufficient detection lower limit of mercury element and low signal-to-noise ratio in traditional metal mercury detection equipment.
[0004] In view of the problems existing in the prior art, an embodiment of the utility model provides a metal mercury detection system, including a metal trap, a protective gas source, and a metal detector. The metal trap includes a heating part. The metal mercury detection system has a first state, a second state, and a third state. In the first state, the metal trap is used to introduce gas to trap mercury elements. In the second state, the heating part is used to heat to form mercury vapor and retain the mercury vapor in the metal mercury detection system. In the third state, the protective gas source is used to blow out a protective gas, and the mercury vapor is blown into the metal detector through the protective gas.
[0005] According to the metal mercury detection system provided by the utility model, it further includes a first three-way valve, a second three-way valve, a third three-way valve, a three-way module, and an electromagnetic valve. The NO end of the first three-way valve is connected to the sample inlet, the NC end is connected to the three-way module, and the COM end is connected to the inlet of the metal trap. The NO end of the second three-way valve is connected to the exhaust port, the NC end is connected to the NC end of the third three-way valve, and the COM end is connected to the outlet of the metal trap. The NO end of the third three-way valve is connected to the three-way module, and the COM end is connected to the metal detector. The protective gas source is connected to the three-way module, and an electromagnetic valve is provided between the protective gas source and the three-way module.
[0006] According to a mercury detection system provided by the present utility model, in the first state, the NO ports, COM ports of the first three-way valve, the second three-way valve and the third three-way valve are opened, and the NC ports are closed, and the solenoid valve is closed; in the second state, the NO ports, NC ports of the first three-way valve and the second three-way valve are opened, the COM ports are closed, the NO port and the COM port of the third three-way valve are opened, the NC port is closed, and the solenoid valve is opened; in the third state, the NC ports and COM ports of the first three-way valve, the second three-way valve and the third three-way valve are opened, the NO ports are closed, and the solenoid valve is opened.
[0007] According to a mercury detection system provided by the present utility model, the heating part includes a heating wire arranged in the metal trap.
[0008] According to a mercury detection system provided by the present utility model, the metal trap further includes a temperature controller electrically connected to the heating wire.
[0009] According to a mercury detection system provided by the present utility model, the protective gas source includes an argon gas cylinder.
[0010] According to a mercury detection system provided by the present utility model, a mercury sample introduction structure is communicated at the sample inlet, and the mercury sample introduction structure includes an electrothermal evaporator, a hydride generator or an atomizer.
[0011] According to a mercury detection system provided by the present utility model, the metal detector includes an atomic emission spectrometer, an atomic absorption spectrometer or an atomic fluorescence spectrometer.
[0012] The mercury detection system provided by the present utility model sets three states for the system. In the first state, the metal trap in the system can trap mercury elements in the gas. In the second state, the heating part can heat to make the mercury elements break away to form mercury vapor and remain in the system. In the third state, the protective gas source can quickly blow the mercury vapor into the metal detector and obtain a stable mercury peak, which can greatly improve the mercury signal-to-noise ratio and the detection ability of the metal detector. Description of the Drawings
[0013] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0014] Figure 1 It is a schematic structural diagram of the mercury detection system provided by the present utility model.
[0015] Reference numerals: 1, metal trap; 11, heating part; 12, thermostat; 2, metal detector; 3, first three-way valve; 4, second three-way valve; 5, third three-way valve; 6, three-way module; 7, solenoid valve; 8, argon gas cylinder; 9, mercury sample introduction structure. Detailed implementation manners
[0016] The following further describes in detail the implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model. In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0017] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.
[0018] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.
[0019] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0020] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.
[0021] The following is combined with Figure 1 to describe the metal mercury detection system provided by the present utility model.
[0022] In view of the problems in the traditional technology that the lower detection limit of mercury element by the metal mercury detection equipment is insufficient and the signal-to-noise ratio is low, the embodiments of the present utility model provide a metal mercury detection system, including a metal trap 1, a protective gas source, and a metal detector 2. The metal trap 1 includes a heating part 11. The metal trap 1 can trap mercury elements in the gas and can release mercury elements by heating through the heating part 11 to form mercury vapor. In the technical solution provided by the present utility model, the metal mercury detection system has a first state, a second state, and a third state. In the first state, the gas to be measured is introduced into the system, and the gas enters the metal trap 1, and the metal trap 1 will trap mercury elements; in the second state, the heating part 11 heats the metal trap 1, and the mercury elements break away from the metal trap 1 and turn into mercury vapor, and the mercury vapor remains in the system; further, in the third state, the protective gas source will blow out the protective gas, and the protective gas will quickly blow the mercury vapor into the metal detector 2 and obtain a stable mercury peak, which can greatly improve the mercury signal-to-noise ratio and improve the detection ability of the metal detector 2.
[0023] Please refer to Figure 1, specifically, the mercury detection system further includes a first three-way valve 3, a second three-way valve 4, a third three-way valve 5, a three-way module 6, and a solenoid valve 7. The NO port of the first three-way valve 3 is connected to the sample inlet, the NC port is connected to the three-way module 6, and the COM port is connected to the inlet of the metal trap 1. The NO port of the second three-way valve 4 is connected to the exhaust port, the NC port is connected to the NC port of the third three-way valve 5, and the COM port is connected to the outlet of the metal trap 1. The NO port of the third three-way valve 5 is connected to the three-way module 6, and the COM port is connected to the metal detector 2. The protective gas source is connected to the three-way module 6, and a solenoid valve 7 is provided between the protective gas source and the three-way module 6. It should be noted that all three ports of the three-way module 6 are in a normally open state.
[0024] The following will describe the gas path of the above detection system in three states in combination with Figure 1 In the first state, the NO ports and COM ports of the first three-way valve 3, the second three-way valve 4, and the third three-way valve 5 are opened, and the NC ports are closed. The solenoid valve 7 is closed. The gas enters the system from the sample inlet, passes through the NO port and COM port of the first three-way valve 3 and enters the metal trap 1. The metal trap 1 will trap the mercury element in the gas, and the exhaust gas is discharged through the COM port and NO port of the second three-way valve 4 through the exhaust port. It should be noted that the solenoid valve 7 remains closed at this time. Although the NO port and COM port of the third three-way valve 5 are opened, no gas enters the third three-way valve 5 at this time. In other alternative embodiments, the opening conditions of the ports of the third three-way valve 5 can be arbitrarily set in the first state. The first state is also called the enrichment stage of the mercury element.
[0025] In the second state, the NO ports and NC ports of the first three-way valve 3 and the second three-way valve 4 are opened, the COM ports are closed, the NO port and COM port of the third three-way valve 5 are opened, and the NC port is closed. The solenoid valve 7 is opened. Specifically, the gas enters the system from the sample inlet, passes through the NO port and NC port of the first three-way valve 3 and enters the three-way module 6. At this time, the solenoid valve 7 is opened, and the gas in the protective gas source also enters the three-way module 6. The gas is mixed with the protective gas and enters the third three-way valve 5, and then enters the metal detector 2 from the NO port and COM port of the third three-way valve 5. It should be noted that the heating part 11 is turned on at this time to heat the metal trap 1, and the mercury element is separated to form mercury vapor. Also, since the COM ports of the first three-way valve 3 and the second three-way valve 4 remain closed, the mercury vapor will exist in the pipeline where the metal detector 2 is located at this time. The second state is also called the airtight preheating stage.
[0026] In the third state, the NC terminals and COM terminals of the first three-way valve 3, the second three-way valve 4, and the third three-way valve 5 are opened, the NO terminals are closed, and the solenoid valve 7 is opened. Specifically, gas is no longer introduced into the system, and the gas in the protective gas source enters the three-way module 6 through the solenoid valve 7, then enters through the NC terminal and COM terminal of the first three-way valve 3, and blows out the mercury vapor in the pipeline where the metal trap 1 is located. The protective gas carries the mercury vapor into the second three-way valve 4, enters through the COM terminal and NC terminal of the second three-way valve 4, then enters the third three-way valve 5, and then enters the metal detector 2 through the NC terminal and COM terminal of the third three-way valve 5. It should be noted that in the technical solution provided by the present invention, the protective gas can quickly blow the mercury vapor into the metal detector 2 and obtain a stable mercury peak, and the mercury signal-to-noise ratio is greatly improved, which can improve the detection ability of the metal detector 2.
[0027] In an alternative embodiment, the protective gas source is an argon gas cylinder 8. Of course, other inert gases can also be selected, and the present invention does not limit this.
[0028] Furthermore, the heating part 11 includes a heating wire provided in the metal trap 1, and heating rods or heating sheets can also be selected. To facilitate temperature monitoring, the metal trap 1 further includes a thermostat 12 electrically connected to the heating wire, which can monitor and confirm the heating temperature in real time.
[0029] It should be noted that a mercury sample introduction structure 9 is connected at the sample inlet. The mercury sample introduction structure 9 includes an electrothermal vaporizer, a hydride generator, or an atomizer. The metal detector 2 includes an atomic emission spectrometer, an atomic absorption spectrometer, or an atomic fluorescence spectrometer.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A metal mercury detection system, characterized in that: It includes a metal collector, a protective gas source and a metal detector, wherein the metal collector includes a heating part; the metal mercury detection system has a first state, a second state and a third state. In the first state, the metal collector is used to pass gas to capture mercury elements, in the second state, the heating part is used to heat to form mercury vapor and retain the mercury vapor in the metal mercury detection system, and in the third state, the protective gas source is used to blow out protective gas, and the mercury vapor is blown into the metal detector through the protective gas.
2. The metal mercury detection system according to claim 1, characterized in that: It also includes a first three-way valve, a second three-way valve, a third three-way valve, a three-way module and a solenoid valve, wherein the NO end of the first three-way valve is connected to the injection port, the NC end is connected to the three-way module, and the COM end is connected to the inlet of the metal collector, the NO end of the second three-way valve is connected to the exhaust port, the NC end is connected to the NC end of the third three-way valve, and the COM end is connected to the outlet of the metal collector, the NO end of the third three-way valve is connected to the three-way module, and the COM end is connected to the metal detector, the protective gas source is connected to the three-way module, and the solenoid valve is arranged between the protective gas source and the three-way module.
3. The metal mercury detection system according to claim 2, characterized in that: In the first state, the NO end and COM end of the first three-way valve, the second three-way valve and the third three-way valve are opened, the NC end is closed, and the solenoid valve is closed; in the second state, the NO end and NC end of the first three-way valve and the second three-way valve are opened, the COM end is closed, the NO end and COM end of the third three-way valve are opened, the NC end is closed, and the solenoid valve is opened; in the third state, the NC end and COM end of the first three-way valve, the second three-way valve and the third three-way valve are opened, the NO end is closed, and the solenoid valve is opened.
4. The metal mercury detection system according to claim 2, characterized in that: The heating part includes a heating wire arranged in the metal collector.
5. The metal mercury detection system according to claim 4, characterized in that: The metal collector also includes a temperature controller electrically connected to the heating wire.
6. The metal mercury detection system according to claim 1, characterized in that: The protective gas source includes an argon gas bottle.
7. The metal mercury detection system according to claim 2, characterized in that: The sample inlet is connected to a mercury sample introduction structure, and the mercury sample introduction structure includes an electric evaporator, a hydride generator or an atomizer.
8. The metal mercury detection system according to claim 1, characterized in that: The metal detector includes an atomic emission spectrometer, an atomic absorption spectrometer or an atomic fluorescence spectrometer.