CN110702666A - System and method for detecting trace heavy metals in air - Google Patents
System and method for detecting trace heavy metals in air Download PDFInfo
- Publication number
- CN110702666A CN110702666A CN201911025059.5A CN201911025059A CN110702666A CN 110702666 A CN110702666 A CN 110702666A CN 201911025059 A CN201911025059 A CN 201911025059A CN 110702666 A CN110702666 A CN 110702666A
- Authority
- CN
- China
- Prior art keywords
- air
- condensed water
- sample
- heavy metals
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
- G01N2001/4027—Concentrating samples by thermal techniques; Phase changes evaporation leaving a concentrated sample
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention relates to the technical field of atmospheric environment monitoring, and provides a system and a method for detecting trace heavy metals in air, wherein the detection system comprises a temperature control system, a semiconductor refrigerating device, a condensed water collecting device and a sample detection assembly, the temperature of the semiconductor refrigerating device is controlled to be consistent with the dew point temperature of the air, so that water vapor in the air is continuously saturated and is quickly condensed on the surface of the refrigerating device, the surface of the refrigerating device is provided with a super-hydrophobic coating, water drops formed after the air is condensed quickly enter the condensed water collecting device, the collected condensed water is transferred to the sample detection assembly, after the condensed water is quickly dried and condensed by heating, a laser beam generated by laser is used for ablating the sample, and the generated plasma is collected and analyzed, so that the type and the concentration of heavy metal elements are obtained, the detection system has a simple structure, and can realize the continuous condensation and collection of the air outdoors, and the continuous and rapid detection of trace heavy metals is realized by combining a spectral analysis method, the operation is convenient, and the sensitivity is high.
Description
Technical Field
The invention relates to the technical field of atmospheric environment monitoring, in particular to a system and a method for detecting trace heavy metals in air.
Background
The atmospheric environment is a precious resource for human life, and the air quality directly influences human health. With the development of productivity and the explosion of global population, resource consumption and waste discharge increase dramatically day by day, automobile exhaust, electroplating, mining, coal burning and the like constitute important sources of atmospheric heavy metal pollution. Heavy metals have nondegradable property, toxicity and biological enrichment, and the water-soluble seed technology in the atmospheric particulates has higher toxicity and biological effectiveness, so that the heavy metals can be leached from the particulates and enter the human body to damage the functions of the human body, and can also enter water body diseases through the atmospheric sedimentation effect to finally damage the health of the human body through a food chain way. Meanwhile, the heavy metal pollutants in the atmosphere have the characteristics of low content, wide coverage range and high diffusion speed, so that the continuous and rapid detection of the heavy metal pollutants in the atmosphere is of great significance.
The conventional method for acquiring the atmospheric heavy metal detection sample adopts a filter membrane to deposit, enrich and sample (particulate matters) at regular time, then the analytic or elution treatment is carried out on the object to be detected, and the digested sample can be used for laboratory analysis; meanwhile, the accumulated amount of the heavy metal in a certain time period is reflected by a timing interval sampling mode, the change condition of the heavy metal pollution in the time period cannot be reflected, and the detection real-time performance of the heavy metal pollution early warning device has certain limitation if the device is used for early warning the heavy metal pollution.
Laser Induced Breakdown Spectroscopy (LIBS) is an atomic emission Spectroscopy technique that uses pulsed Laser light to excite a material to generate a plasma, in which atoms, ions and free electrons contained in the plasma emit electromagnetic radiation during cooling thereof, and elemental analysis is performed by analyzing the emission spectrum in an excited state. As a universal, non-contact and powerful atomic spectrum method, composition data of different content levels (trace, trace and large) of elements can be rapidly provided in a sample preparation-free and lossless manner; the system has simple composition and high automation degree. The optical detection technology, which is a new optical detection technology emerging in recent years, is considered to be one of the most promising detection technologies due to its characteristics of rapid multi-element nondestructive detection and simple system structure.
However, in the aspect of sample collection, in the conventional air condensed water collection device, the magnesium chloride modified silica gel is firstly used as an adsorbent to adsorb moisture in the air, and then the concentrated moisture is desorbed by the light-gathering heating adsorbent, so that the condensation of the moisture in the air is realized. The device can be used as a better water collecting device, and is limited in that the water vapor is collected and collected into two independent processes, and the desorption process can be carried out only under the condition of sunshine.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a system and a method for detecting trace heavy metals in air, which aim to solve the problems that the existing method cannot continuously collect trace heavy metals and the trace heavy metals in air condensate water are quickly and sensitively detected based on the continuous collection method.
(II) technical scheme
In order to solve the above technical problem, according to a first aspect of an embodiment of the present invention, there is provided a system for detecting trace heavy metals in air, including: the temperature control system, the air dew point temperature detection component, the semiconductor refrigerating device and the condensed water collecting device are arranged on the semiconductor refrigerating device, and the refrigerator temperature detection component is arranged on the semiconductor refrigerating device;
the air dew point temperature detection component and the refrigerator temperature detection component are both connected with the temperature control system, the semiconductor refrigeration device is connected with the temperature control system, and the temperature control system is used for controlling the temperature of the semiconductor refrigeration device to be equal to the dew point temperature in the air;
the condensed water collecting device is used for collecting water drops condensed on the surface of the semiconductor refrigerating device.
Further, the system for detecting trace heavy metals in air further comprises:
a sample drying assembly for holding a water sample extracted from the condensate collection device;
the heating tray is used for heating the sample drying assembly so as to evaporate and gather water in the water body sample into a solid dried substance;
and the atomic spectrum collection and analysis device is used for detecting the types and the corresponding contents of the heavy metal elements in the solid dried substance.
Further, the semiconductor refrigeration device is a TEC refrigerator, the condensed water collection device comprises a condensed water collection plate for condensing the water drops, and the condensed water collection plate is connected with the TEC refrigerator.
Further, the condensed water collecting plate is an aluminum plate, and the outer surface of the aluminum plate is coated with a super-hydrophobic coating.
Further, the sample drying assembly comprises a metal plate, wherein a pit is preset in the surface of the metal plate, and the surface of the pit is coated with a super-hydrophobic coating for containing the water body sample.
Further, the number of the pits is multiple, and the pits are distributed on the surface of the metal plate in a parallel array.
Further, the system for detecting trace heavy metals in air further comprises: and the solar power supply system is used for supplying power to the temperature control system and the semiconductor refrigerating device.
Furthermore, the condensed water collecting device also comprises a condensed water collector, and a channel for collecting condensed water is arranged at the bottom edge of the condensed water collecting plate;
and the inlet of the condensed water collector is in butt joint with the water outlet of the channel and is used for containing the condensed water collected in the channel.
According to a second aspect of the embodiments of the present invention, there is provided a method for detecting trace heavy metals in air, using the system for detecting trace heavy metals in air according to the first aspect of the embodiments of the present invention, including:
s1, sucking a water body sample with a preset dosage from the sample collector and placing the water body sample into a pit of the sample drying assembly;
s2, placing the sample drying component on a heating tray, heating and drying the water body sample, stopping heating after all water is evaporated, and converging the water body sample at the bottom of the pit to form a solid dried substance;
and S3, detecting the types and the corresponding contents of the heavy metal elements in the solid dried substance by using an atomic spectrum collection and analysis device.
Further, between the S2 and S1, further comprising: and dropwise adding a red rhodamine solution into the water body sample.
(III) advantageous effects
According to the system for detecting the trace heavy metals in the air, provided by the embodiment of the invention, the semiconductor refrigeration is combined with the dew point temperature control technology, so that the temperature of the air contacted with the surface of the refrigerator is always controlled to be close to the dew point temperature, the continuous condensation and collection of water vapor in the air are realized, and meanwhile, conditions are provided for continuous detection.
Furthermore, the method for detecting trace heavy metals in air provided by the embodiment of the invention does not need chemical reagents, the sample assembly covered with the super-hydrophobic coating and the surface pit structure thereof are directly utilized to realize rapid heating, drying, enrichment and efficient convergence of condensed water before detection, the liquid-solid conversion of the sample is completed, the laser spectrum detection technology and the space constraint structure of the device are utilized to realize high-sensitivity and quantitative detection of soluble heavy metals in air, and the problems of poor consistency of results and low sensitivity existing in the direct detection of gas and liquid are effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic connection diagram of an air condensate water collecting device of a system for detecting trace heavy metals in air according to an embodiment of the present invention;
FIG. 2 is a schematic connection diagram of an air condensate water collecting device of the system for detecting trace heavy metals in air according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a sample drying assembly of the system for detecting trace heavy metals in air according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a well of a sample drying assembly in an embodiment of the present invention;
in the figure: 1-a solar power supply system; 2-a temperature control system; 3-air dew point temperature detection component; 4-a refrigerator temperature detection part; 5-super-hydrophobic coating; 6-a condensate water collecting plate; 7-a semiconductor refrigeration device; 8-a heat conducting pipe; 9-a fan; 10-a channel; 11-condensed water; 12-a condensate collector; 13-a sample drying assembly; 14-pit.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a system for detecting trace heavy metals in air, which mainly includes an air condensate water collecting device, and specifically includes: the temperature control system 2 is used as a core control component of the whole system and is mainly used for controlling the temperature of the semiconductor refrigerating device 7 to be consistent with the dew point temperature of air.
Specifically, a refrigerator temperature detection component 4 is arranged on the semiconductor refrigerating device 7, the air dew point temperature detection component 3 and the refrigerator temperature detection component 4 are both connected with the temperature control system 2, meanwhile, the semiconductor refrigerating device 7 is electrically connected with the temperature control system 2, and the temperature of the semiconductor refrigerating device 7 is controlled to be equal to the air dew point temperature by the temperature control system 2, so that water vapor in the air continuously reaches saturation and is rapidly condensed on the surface of the semiconductor refrigerating device 7, and continuous collection is facilitated. A condensed water collecting device is arranged below the semiconductor refrigerating device 7, so that condensed water drops on the surface of the semiconductor refrigerating device 7 can be conveniently collected.
The air condensed water collecting device is placed outdoors, the solar power supply system 1 can output voltage DC12V, a 12Ah lead-acid storage battery is equipped for converting electric energy for storage, and power output is provided for the temperature control system 2 and the semiconductor refrigerating device 7. Of course, the temperature control system 2 and the semiconductor refrigeration device 7 may be directly supplied with power by other power supply methods such as a battery or ac to dc. The air dew point temperature detecting part 3 may employ an SHT11 sensor, the refrigerator temperature detecting part 4 may employ a thermistor PT00, and the semiconductor cooling device 7 may employ a tec (thermo Electric cooler) refrigerator.
The specific working process is as follows: after the temperature control system 2 is started to work, the air dew point temperature is continuously collected through the connected SHT11 sensor, the temperature of the TEC refrigerator and the aluminum plate connected with the TEC refrigerator is collected through the thermistor PT00, and comparison is carried out, wherein the air dew point temperature is lower than the air temperature under the general condition.
The temperature control system 2 controls the power supply output current supplied to the TEC refrigerator through an internally integrated PID algorithm (the TEC refrigerator controls cooling and heating through the direction of the input current, and controls the cooling and heating speeds through the magnitude of the input current), and makes the TEC refrigerator in a cooling state, controls the cooling temperature through the output current until the temperature of the connection TEC refrigerator is equal to the air dew point temperature, and at this time, the air is in a saturated state and liquid droplets are formed on the surface of the TEC refrigerator.
According to the system for detecting the trace heavy metals in the air, provided by the embodiment of the invention, the semiconductor refrigeration is combined with the dew point temperature control technology, so that the temperature of the air contacted with the surface of the refrigerator is always controlled to be close to the dew point temperature, the continuous condensation and collection of water vapor in the air are realized, and meanwhile, conditions are provided for continuous detection.
On the basis of the above embodiment, in order to facilitate the detection of the heavy metal elements in the collected condensed water, the system for detecting trace heavy metals in air in the embodiment includes a sample detection device, and the sample detection device specifically includes:
as shown in fig. 3, the sample drying assembly 13 is used for containing the water sample extracted from the condensed water collecting device, and can be used for quickly drying and collecting the condensed water sample. The heating tray is used for heating the sample drying assembly so as to evaporate and gather water in the water body sample into a solid drying object.
The atomic spectrum collecting and analyzing device can adopt the existing spectrum detection device and is mainly used for detecting the types and the corresponding contents of the heavy metal elements in the solid drying materials. The method comprises the steps of generating plasma by laser ablation of a substance to be detected, comparing an NIST standard atomic emission spectrum library by analyzing plasma spectral characteristics, and determining the element type and the spectral intensity to reflect the element content by using characteristic wavelength.
Specifically, the atomic spectrum collection and analysis device mainly ablates a dried sample after focusing laser with a specific wavelength to generate an atomic reflection spectrum, and then collects the spectrum by using a connected fiber spectrometer. The laser in this embodiment is Nd: the emitting wavelength of a YAG Q-switched laser is 1064nm, and the temperature of a substrate is controlled at 20 ℃ by using a temperature control system of the laser. The laser is controlled to focus and hit the emitted light beam at the position of the solid drying object. The system adopts quartz fiber to collect optical signals, and the quartz fiber and the sample stage form an angle of 45 degrees.
In this embodiment, the time interval between laser excitation and spectrometer acquisition is set to 0.5 microseconds. The high-resolution light splitting system adopted in the embodiment is of a concave grating structure, a 511-unit linear array CCD detector is applied, the detector is made of silicon, the acquisition waveband is 300-100 nm, the resolution is 0.5nm, and the integration time is 1 ms. And calculating to obtain the concentration of the specific heavy metal element by utilizing the obtained spectral intensity corresponding to the calibration curve.
On the basis of the above embodiment, the condensed water collecting device includes a condensed water collecting plate 6 for condensing the water drops, and the condensed water collecting plate 6 has a plate-shaped structure. In this embodiment, the condensed water collecting plate 6 is obliquely installed on the upper surface of the TEC refrigerator and connected to the cooling part of the TEC refrigerator.
Further, the condensed water collecting plate 6 in the embodiment is made of an aluminum plate, so that the condensed water collecting plate is light in weight and is beneficial to forming and manufacturing. The outer surface of the aluminum plate is coated with the super-hydrophobic coating 5, the super-hydrophobic coating 5 has good hydrophobic property, liquid drops can be quickly separated from the surface of the metal plate to enter the collecting device in the air condensation process, and the phenomenon that substances in the liquid drops are deposited on the surface of the metal plate or are attached to the surface of the metal plate for a long time to form secondary evaporation is avoided.
Specifically, the size of the aluminum plate can be set to 80mm, in order to ensure good liquid water collecting effect, the super-hydrophobic coating 5 is sprayed on the surface of the aluminum plate, the coating has good hydrophobic property, liquid drops can be quickly separated from the surface of the metal plate to enter the collecting device in the air dewing process, and the phenomenon that substances in the liquid drops are deposited on the surface of the metal plate or are attached to the surface of the metal plate for a long time to form secondary evaporation is avoided.
The aluminum plate is in good contact with the surface of the TEC refrigerator, so that the temperature of the TEC refrigerator is well conducted with the temperature of the aluminum plate, and the TEC refrigerator is surrounded by heat insulation cotton to isolate the energy conduction of upper surface refrigeration and lower surface heat dissipation. The heat dissipation of the lower surface is mainly realized by connecting the heat conduction pipe 8 and the heat dissipation fins, and the fans 9 at the two ends of the heat conduction pipe 8 respectively suck and remove air, so that the heat absorbed by the heat dissipation fins is taken away, and the purpose of heat dissipation of the lower surface of the TEC refrigerator is achieved.
In the above embodiments, as shown in fig. 2, the condensed water collecting device further includes a condensed water collector 12 besides the condensed water collecting plate 6, since the condensed water collecting plate 6 is disposed obliquely, a channel 10 for collecting condensed water 11 is provided at a bottom edge thereof, and an inlet of the condensed water collector 12 is in butt joint with a water outlet of the channel 10 for receiving the condensed water 11 collected in the channel 10 for subsequent detection and analysis.
In addition to the above embodiments, as shown in fig. 3, the sample drying assembly 13 is a metal plate with a preset pit 14 on the surface, and the metal plate may be a steel plate, an aluminum plate or an iron plate, and considering the weight of the metal plate, the aluminum plate is preferred. As shown in fig. 4, the pit 14 has an overall conical structure for containing a liquid sample extracted from the condensed water collection device by a pipette, and the super-hydrophobic coating can further improve the concentration level of the condensed water after drying, so that a solid dried substance spot with a diameter of several hundred micrometers is finally formed at the bottom of the pit 14 of the sample drying component 13.
Further, the inner surfaces of the pits 14 are also coated with the super-hydrophobic coating, so that the liquid sample is prevented from being attached to the surface of the component in the drying process to cause measurement errors, and meanwhile, the gathering effect of the dried liquid is improved. In addition, the pit-shaped structure also has a space constraint effect on plasma generated by exciting a sample by laser during detection, so that the spectral signal is enhanced. The liquid-solid conversion, the efficient convergence of the super-hydrophobic coating and the spatial constraint signal enhancement are combined, and the sensitivity and the detection limit of sample detection are improved together.
The number of the pits 14 can be multiple, and the specific number can be set according to actual needs; a plurality of pits are distributed on the surface of the metal plate in a parallel array mode, so that a plurality of water body samples can be dried and detected, and the detection efficiency and the detection precision are improved.
Based on the content of the above embodiments, an embodiment of the present invention further provides a method for detecting and analyzing heavy metal elements, where the system for detecting trace heavy metals in air described in the above embodiments is used, and the method specifically includes the following steps:
s1, sucking 20uL of the water sample from the sample collector and placing the sample into a pit of the sample drying component; s2, placing the sample drying component on a heating tray, heating and drying the water body sample at a set temperature, stopping heating after all water is evaporated, and converging the water body sample at the bottom of the pit to form a solid dried substance; and S3, detecting the types and the corresponding contents of the heavy metal elements in the solid dried substances by an atomic spectrum collection and analysis device.
Specifically, first, 20uL of a water sample was drawn from the sample collector with a pipette and dropped into the groove of the sample drying member covered with the superhydrophobic coating. And then, placing the sample drying assembly on a heating tray, heating and drying the liquid sample at a set temperature of 60-80 ℃, stopping heating after all water is evaporated, and converging the object to be detected into a solid dried object. And finally, a laser excitation device in the atomic spectrum collection and analysis device is used for emitting 1064nm laser to strike the surface of the enriched solid to be detected dry object, after the laser striking, the atomic emission spectrum is collected through a collection optical fiber, and the atomic emission spectrum of the elements contained in the excited sample is obtained through the analysis device.
In order to further improve the accuracy of measurement, the steps can be repeated for 3-5 times, the analysis device obtains the heavy metal content information by using each point position, and the heavy metal content in the water body sample is obtained in an averaging mode.
Furthermore, in order to improve the positioning accuracy of the object to be detected, a trace amount of red rhodamine solution which consists of C, H, O, N element can be dripped into the condensed water, so that the detection of the heavy metal element is not interfered. The dosage of the red rhodamine solution can be set according to actual requirements, and is not particularly limited here.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A trace heavy metal detecting system in air, its characterized in that includes: the temperature control system, the air dew point temperature detection component, the semiconductor refrigerating device and the condensed water collecting device are arranged on the semiconductor refrigerating device, and the refrigerator temperature detection component is arranged on the semiconductor refrigerating device;
the air dew point temperature detection component and the refrigerator temperature detection component are both connected with the temperature control system, the semiconductor refrigeration device is connected with the temperature control system, and the temperature control system is used for controlling the target temperature of the semiconductor refrigeration device to be equal to the air dew point temperature;
the condensed water collecting device is used for collecting water drops condensed on the surface of the semiconductor refrigerating device.
2. The system for detecting trace heavy metals in air according to claim 1, further comprising:
the sample drying assembly is used for containing a water body sample to be detected, which is extracted from the condensed water collecting device;
the heating tray is used for heating the sample drying assembly so as to evaporate and gather water in the water body sample into a solid dried substance;
and the atomic spectrum collection and analysis device is used for detecting the types and the corresponding contents of the heavy metal elements in the solid dried substance.
3. The system for detecting trace heavy metals in air according to claim 1 or 2, wherein the semiconductor refrigerating device is a TEC refrigerator, the condensed water collecting device comprises a condensed water collecting plate for condensing the water drops, and the condensed water collecting plate is connected with the TEC refrigerator.
4. The system for detecting trace heavy metals in air according to claim 3, wherein the condensed water collecting plate is an aluminum plate, and the outer surface of the aluminum plate is coated with a super-hydrophobic coating.
5. The system for detecting trace heavy metals in air according to claim 2, wherein the sample drying assembly comprises a metal plate, a pit is preset on the surface of the metal plate, and the surface of the pit is coated with a super-hydrophobic coating for containing the water body sample.
6. The system for detecting the trace amount of heavy metals in the air as claimed in claim 5, wherein the number of the pits is plural, and the plural pits are distributed on the surface of the metal plate in a parallel array.
7. The system for detecting trace heavy metals in air according to claim 1 or 2, further comprising: and the solar power supply system is used for supplying power to the temperature control system and the semiconductor refrigerating device.
8. The system for detecting the trace heavy metals in the air as claimed in claim 3, wherein the condensed water collecting device further comprises a condensed water collector, and a channel for collecting condensed water is arranged at the bottom edge of the condensed water collecting plate;
and the inlet of the condensed water collector is in butt joint with the water outlet of the channel and is used for containing the condensed water collected in the channel.
9. A method for detecting trace heavy metals in air, which utilizes the system for detecting trace heavy metals in air according to any one of claims 2 to 8, comprising:
s1, sucking a water body sample with a preset dosage from the sample collector and placing the water body sample into a pit of the sample drying assembly;
s2, placing the sample drying assembly on a heating tray, heating and drying the water body sample, and gathering the water body sample at the bottom of the pit to form a solid dried substance;
and S3, detecting the types and the corresponding contents of the heavy metal elements in the solid dried substance by using an atomic spectrum collection and analysis device.
10. The method for detecting trace heavy metals in air according to claim 9, further comprising between the steps of S2 and S1: and dropwise adding a red rhodamine solution for positioning and identifying the heavy metal elements to be detected in the solid drying matter into the water body sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911025059.5A CN110702666A (en) | 2019-10-25 | 2019-10-25 | System and method for detecting trace heavy metals in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911025059.5A CN110702666A (en) | 2019-10-25 | 2019-10-25 | System and method for detecting trace heavy metals in air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110702666A true CN110702666A (en) | 2020-01-17 |
Family
ID=69203547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911025059.5A Pending CN110702666A (en) | 2019-10-25 | 2019-10-25 | System and method for detecting trace heavy metals in air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110702666A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111938708A (en) * | 2020-07-02 | 2020-11-17 | 王少熙 | Mask capable of collecting spray samples and method |
| CN113391033A (en) * | 2021-06-10 | 2021-09-14 | 安徽创新检测技术有限公司 | High-efficiency air heavy metal content detection method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3543531A1 (en) * | 1985-12-10 | 1987-10-15 | Saxonlord Ltd | Process for cleaning waste gases, flue gases and combustion gases |
| US20100074817A1 (en) * | 2006-12-27 | 2010-03-25 | Babcock-Hitachi Kabushiki Kaisha | Method and apparatus for treating discharge gas |
| CN103411930A (en) * | 2013-07-26 | 2013-11-27 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body |
| CN105784682A (en) * | 2016-05-10 | 2016-07-20 | 中国科学院光电研究院 | Detection device and detection method by laser induced breakdown spectroscopy |
| CN205691507U (en) * | 2016-04-14 | 2016-11-16 | 浙江师范大学 | The highly sensitive quantitative testing device of heavy metal element in a kind of atmospheric aerosol |
| CN205954750U (en) * | 2016-08-28 | 2017-02-15 | 中国计量大学 | Semiconductor dew point condensing water extraction from air device of solar drive |
| CN109374596A (en) * | 2018-11-08 | 2019-02-22 | 天津大学 | Portable flue gas heavy metal element detection system based on laser induced breakdown spectroscopy |
-
2019
- 2019-10-25 CN CN201911025059.5A patent/CN110702666A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3543531A1 (en) * | 1985-12-10 | 1987-10-15 | Saxonlord Ltd | Process for cleaning waste gases, flue gases and combustion gases |
| US20100074817A1 (en) * | 2006-12-27 | 2010-03-25 | Babcock-Hitachi Kabushiki Kaisha | Method and apparatus for treating discharge gas |
| CN103411930A (en) * | 2013-07-26 | 2013-11-27 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body |
| CN205691507U (en) * | 2016-04-14 | 2016-11-16 | 浙江师范大学 | The highly sensitive quantitative testing device of heavy metal element in a kind of atmospheric aerosol |
| CN105784682A (en) * | 2016-05-10 | 2016-07-20 | 中国科学院光电研究院 | Detection device and detection method by laser induced breakdown spectroscopy |
| CN205954750U (en) * | 2016-08-28 | 2017-02-15 | 中国计量大学 | Semiconductor dew point condensing water extraction from air device of solar drive |
| CN109374596A (en) * | 2018-11-08 | 2019-02-22 | 天津大学 | Portable flue gas heavy metal element detection system based on laser induced breakdown spectroscopy |
Non-Patent Citations (1)
| Title |
|---|
| BAUTISTA-OLIVAS ANA LAURA ET AL.: "Concentration of heavy metals in condensed atmospheric water vapor at three Mexican localities", 《ATMÓSFERA》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111938708A (en) * | 2020-07-02 | 2020-11-17 | 王少熙 | Mask capable of collecting spray samples and method |
| CN111938708B (en) * | 2020-07-02 | 2024-05-31 | 王少熙 | Mask and method capable of collecting spray samples |
| CN113391033A (en) * | 2021-06-10 | 2021-09-14 | 安徽创新检测技术有限公司 | High-efficiency air heavy metal content detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Schmidt et al. | Online single particle analysis of ice particle residuals from mountain-top mixed-phase clouds using laboratory derived particle type assignment | |
| CN110702666A (en) | System and method for detecting trace heavy metals in air | |
| CN102279171B (en) | Method for promoting sensitivity of metal pollutants in water in laser breakdown spectrum detection | |
| CN109580583A (en) | A kind of dense form Raman spectrum base and the preparation method and application thereof | |
| Nischkauer et al. | Radial line-scans as representative sampling strategy in dried-droplet laser ablation of liquid samples deposited on pre-cut filter paper disks | |
| Zheng et al. | Online mercury determination by laser-induced breakdown spectroscopy with the assistance of solution cathode glow discharge | |
| CN201107273Y (en) | Atomic fluorescent spectrometer | |
| Kovacs et al. | Development of direct atmospheric sampling for laser ablation-inductively coupled plasma-mass spectrometry | |
| Shi et al. | Exploration of a 3D nano-channel porous membrane material combined with laser-induced breakdown spectrometry for fast and sensitive heavy metal detection of solution samples | |
| CN111693497A (en) | Portable aquatic uranium detector | |
| FR2943785A1 (en) | METHOD FOR DETECTING AND QUANTIFYING INTEREST ANALYTES IN A LIQUID AND DEVICE FOR CARRYING OUT SAID METHOD | |
| Li et al. | Direct multi-elemental analysis of whole blood samples by LA-ICP-MS employing a cryogenic ablation cell | |
| Sullivan et al. | Characterization of individual aerosol particles | |
| Sajjad et al. | Comprehensive insights into advances in ambient bioaerosols sampling, analysis and factors influencing bioaerosols composition | |
| US8969832B2 (en) | Electrothermal vaporization atomic fluorescence spectroscopy and spectrometer for determination of cadmium | |
| An et al. | Recent progress in online detection methods of bioaerosols | |
| CN109900778B (en) | Matrix-free black phosphorus detection method based on MA L DI-TOF MS (Mass Spectrometry) dual-ion mode | |
| CN117214151A (en) | Quantitative detection method for trace elements in water body | |
| CN102890077A (en) | Double-optical path Raman spectrometer | |
| Lüdke et al. | Determination of trace metals in size fractionated particles from arctic air by electrothermal vaporization inductively coupled plasma mass spectrometry | |
| Qiao et al. | A novel calibration strategy for the analysis of airborne particulate matter by direct solid sampling ETV-ICP-MS | |
| Lüdke et al. | Determination of trace-metal concentrations in size-classified atmospheric particles by ETV-ICP-MS | |
| JPWO2021061330A5 (en) | ||
| RU2654314C1 (en) | Electrochemical cell with graphene electrode for in situ research of electrode materials and solid or gel electrolytes | |
| Chen et al. | Simple in situ preconcentration for electrolyte atmospheric liquid discharge optical emission spectrometric determination of trace cadmium on microplastics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200117 |