Material flux box suitable for non-soil ground monitoring

Abstract

The invention discloses a material flux box suitable for non-soil ground monitoring. The material flux box mainly comprises a flux box main body, a sealing box and a glue injection arch bridge, the flux box main body and the sealing box are rectangular boxes with openings in the lower bottoms, and the rectangular boxes are made of organic glass; glue injection holes are formed in the top face of the sealing box, and sealing strip bayonets are formed in the rectangular edge of the bottom of the sealing box. Accordingly, the inventor also establishes a corresponding measurement method which uses the material flux box, adopts the sealing strips to surround the flux box main body to form three concentric-square-shaped sealing grooves, and adopts a double-arch bridge structure to firstly inject glue, then coat a film and then inject water to form'hydraulic glue seal ', so that sealing is realized. The sealing effect is good, it can be ensured that the flux box body makes close contact with the ground, and the purpose of measuring the mercury exchange flux value between the urban ground and the atmosphere interface is achieved. In addition, the material flux box is simple in structure, convenient to machine and operate, capable of saving capital cost, convenient to install, environmentally friendly and free of pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of mercury exchange between urban ground and atmosphere interface, and in particular relates to a material flux box suitable for non-soil ground monitoring. Background Art

[0002] Mercury is a heavy metal widely used in industrial production. It can migrate over long distances and has strong biological toxicity. The concentration of atmospheric mercury in most typical cities in my country varies in different seasons. In northern cities, the concentration of atmospheric mercury in winter is often higher than that in summer, mainly due to heating factors, and is generally twice as high. From a spatial perspective, the concentration of atmospheric mercury in urban areas is often higher than that in suburbs, and the concentration in suburbs is often higher than that in rural areas. This is mainly because urban residents tend to release large amounts of mercury during activities, such as automobile exhaust and household coal burning. Mercury can damage the central nervous system and have adverse effects on the mouth, mucous membranes and teeth. Long-term exposure to high mercury environments can cause brain damage and death.

[0003] Mercury is a persistent and toxic heavy metal pollutant that is bidirectionally transported between the earth and air interface. Quantitative determination of the exchange flux of mercury between the earth and air interface is a key factor in correctly understanding the global cycle of mercury.

[0004] Surface mercury release is an important area of ​​mercury pollution research, which is of great significance for in-depth understanding of atmospheric mercury cycle. In recent years, there have been many studies on surface mercury release at home and abroad, but they are mainly concentrated in forest soil and laboratory simulation studies. Surface mercury release is an extremely complex process, which is affected by many factors. At present, there are few studies on urban surface mercury release and its influencing factors, and the urban area mercury cycle is the most active part of the global mercury cycle. The urban ecosystem is an open, non-equilibrium stable open system that constantly exchanges substances with the outside world. Among the heavy metal pollution to the urban ecological environment, mercury pollution can be said to be the first to bear the brunt. Moreover, after decades of investigation, it has been found that near-surface atmospheric mercury pollution is the most serious pollution to the urban ecosystem. A large amount of near-surface atmospheric mercury data proves that the investigation of urban near-surface atmospheric mercury is of great practical significance for the evaluation of urban ecological effects. Among them, asphalt land is a type of land with a large proportion in urban use, and its surface mercury release should be given sufficient attention to its contribution to atmospheric mercury.

[0005] Reports show that the concentration of total gaseous mercury (TGM) in Chinese urban areas is about 1.55 times that of similar urban types in North America and Europe. The concentration of particulate mercury (PHg) in Chinese cities is two orders of magnitude higher than that in North America and Europe. The high concentration of atmospheric mercury causes a large amount of atmospheric mercury to settle on the surface. The atmospheric mercury deposition in urban areas is 12 orders of magnitude and 12 times higher than that in North America, respectively. Pollution in northern Chinese cities mainly comes from industrial pollution and coal-fired heating in winter. Mercury pollution is more prominent among these types of pollution. Research on urban mercury pollution can provide an important scientific basis for the rational planning and utilization of cities, the improvement and enhancement of urban environmental quality, and the protection of human health.

[0006] Since 1980, the observation and research of mercury flux from the surface to the atmosphere has been widely carried out. The international methods for measuring mercury flux between the ground / air interface mainly include flux box method and micrometeorological method. The dynamic flux box method is widely used in the measurement of mercury exchange flux between the ground / air interface due to its advantages of low cost, easy operation in the field and strong mobility, but it is not suitable for the measurement of mercury exchange flux between the city-to-city ground / air interface. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a material flux box suitable for non-soil ground monitoring, so as to enable the flux box to measure the ground / air mercury exchange flux on the urban surface.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A material flux box suitable for non-soil ground monitoring mainly includes a flux box body, a sealing box and a glue injection arch bridge; the flux box body and the sealing box are both rectangular boxes with bottom openings, and the rectangular boxes are both made of plexiglass; a glue injection hole is provided on the top surface of the sealing box, and a sealing strip bayonet is provided on the bottom rectangular edge of the sealing box.

[0010] The above-mentioned material flux box also includes three round-shaped sealing grooves located on the same plane from the inside to the outside, and the flux box body and the lower bottom of the sealing box are located on the plane; the first sealing groove is surrounded by a sealing strip along the outer rectangular edge of the lower bottom of the flux box body; the second sealing groove is located outside the first sealing groove and is surrounded by the distance between two sealing strips; the third sealing groove is located outside the second sealing groove and is surrounded by the distance between two sealing strips; the sealing box is located on the left side of the flux box body and is horizontally arranged on the three round-shaped sealing grooves, and corresponding sealing strip snap-in slots are respectively opened at the connection between the bottom rectangular edge of the sealing box and the sealing groove.

[0011] The glue injection arch bridge is in the shape of an arch bridge and is made of organic glass. A glue injection groove is arranged on the upper surface of the arch bridge from one end to the other end.

[0012] There are two glue injection arch bridges, which are arranged side by side in the sealing box to form a side by side double arch bridge structure. One glue injection arch bridge spans between the first sealing groove and the second sealing groove, and the other glue injection arch bridge spans between the second sealing groove and the third sealing groove.

[0013] A glue injection hole is provided on the top surface of the sealing box corresponding to the position of the glue injection arch bridge.

[0014] The size of the flux box body is 40cm×40cm×100cm, the size of the sealing box is 50cm×20cm×20cm, the size of the injection arch bridge is a radius of 10.75cm and a height of 18cm; the widths of the three circular sealing grooves are 5cm, 4cm, and 3cm from inside to outside respectively.

[0015] The above-mentioned material flux box is used to measure the mercury exchange flux between the urban ground and the atmosphere interface.

[0016] The method for measuring the mercury exchange flux between the urban ground and the atmosphere interface is carried out using the above-mentioned material flux box.

[0017] According to the above measurement method, the flux box body is first placed on the ground plane, and a sealing strip is used to surround the outer edge of the lower rectangular bottom of the flux box body to form a first sealing groove; then, outside the first sealing groove, a second sealing groove is surrounded by the spacing between two sealing strips, and the third sealing groove is surrounded by the same method; then, two glue-injected arch bridges are arranged side by side on the left side of the flux box body to form a double-arch bridge structure, one glue-injected arch bridge spans between the first sealing groove and the second sealing groove, and the other glue-injected arch bridge spans between the second sealing groove and the third sealing groove; then, the sealing box is placed on the left side of the flux box body to cover the double-arch bridge structure and is arranged horizontally on the three round-shaped sealing grooves, and the sealing strip snap-on at the bottom rectangular edge of the sealing box is matched and connected with the corresponding sealing groove; finally, glue is injected into the three round-shaped sealing grooves through the glue injection hole, and after the glue injection is completed, a plastic wrap is covered on the glue in the sealing groove, and water is injected from the glue-injected arch bridge to form a "water pressure glue seal" to achieve sealing.

[0018] Polyurethane glue is used for injection.

[0019] In view of the problems existing in the current measurement of mercury exchange flux between the ground and air on the urban surface, the inventor has designed a material flux box suitable for non-soil ground monitoring, which mainly includes a flux box body, a sealing box and a glue injection arch bridge; the flux box body and the sealing box are both rectangular boxes with bottom openings, and the rectangular boxes are both made of organic glass; a glue injection hole is provided on the top surface of the sealing box, and a sealing strip bayonet is provided on the bottom rectangular edge of the sealing box. Based on this, the inventor has also established a corresponding measurement method, which uses the above-mentioned material flux box, uses a sealing strip to form three round-shaped sealing grooves around the flux box body, and forms a "hydraulic glue seal" through a double arch bridge structure by first injecting glue, then coating, and then injecting water, thereby achieving sealing. The present invention has a good sealing effect. The application of the present invention can ensure that the flux box body is in close contact with the ground, achieve the purpose of measuring the mercury exchange flux value between the urban ground and the atmosphere interface, and increase the research on urban surface mercury release factors, so as to be used for reasonable planning and utilization of cities, improvement and enhancement of urban environmental quality, and protection of human health. In addition, the material flux box of the present invention has a simple structure, the raw materials (plexiglass, polyurethane glue, common door and window sealing strips) are from a wide source, it is easy to process and operate, saves capital costs, is wear-resistant, light, easy to carry, easy to install, and environmentally friendly and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the overall structure of the material flux box suitable for non-soil ground monitoring according to the present invention.

[0021] Figure 2 It is a schematic diagram of the top view of the structure of three zigzag sealing grooves in the material flux box of the present invention.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of three meander-shaped sealing grooves in the material flux box of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the glue injection arch bridge in the material flux box of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the sealing box in the material flux box of the present invention.

[0025] In the figure: 1 flux box body, 2 sealing box, 3 glue injection arch bridge, 4 sealing strip, 5 glue injection hole, 6 glue injection groove, 7 sealing groove, 8 cling film, 9 sealing strip bayonet. DETAILED DESCRIPTION

[0026] 1. Basic structure

[0027] like Figures 1 to 5 As shown, the present invention is suitable for a material flux box for non-soil ground monitoring, and mainly includes a flux box body 1, a sealing box 2, a glue injection arch bridge 3, and three round-shaped sealing grooves located on the same plane from the inside to the outside, and the bottom of the flux box body and the sealing box are located on the plane.

[0028] The flux box body and the sealed box are both rectangular boxes with an opening at the bottom, and the rectangular boxes are both made of organic glass;

[0029] The top surface of the sealing box has a glue injection hole 5 corresponding to the injection arch bridge position. The sealing box is located on the left side of the flux box body and is horizontally arranged on the three round-shaped sealing grooves. The bottom rectangular edge of the sealing box and the connection between the sealing grooves are respectively provided with corresponding sealing strip bayonet 9.

[0030] The first sealing groove is formed by a sealing strip 4 surrounding the outer edge of the bottom rectangle of the flux box body; the second sealing groove is located outside the first sealing groove and is surrounded by the distance between the two sealing strips; the third sealing groove is located outside the second sealing groove and is surrounded by the distance between the two sealing strips.

[0031] The injection arch bridge is in the shape of an arch bridge, and is made of organic glass. The upper surface thereof is provided with an injection groove 6 from one end of the arch bridge to the other end, so that the injection of glue flows to the sealing groove at both ends. There are two injection arch bridges, which are arranged side by side in the sealing box to form a side-by-side double arch bridge structure, one injection arch bridge spans between the first sealing groove and the second sealing groove, and the other injection arch bridge spans between the second sealing groove and the third sealing groove.

[0032] The size of the flux box body is 40cm×40cm×100cm, the size of the sealing box is 50cm×20cm×20cm, the size of the injection arch bridge is a radius of 10.75cm and a height of 18cm; the widths of the three circular sealing grooves are 5cm, 4cm, and 3cm from inside to outside respectively.

[0033] 2. Usage

[0034] The material flux box of the present invention is used to measure the mercury exchange flux between the urban ground and the atmosphere interface. The specific method is as follows: first, the flux box body is placed on the ground plane, and a sealing strip is used to surround the outer edge of the lower rectangular bottom of the flux box body to form a first sealing groove; then, outside the first sealing groove, a second sealing groove is surrounded by the spacing between two sealing strips, and a third sealing groove is surrounded by the same method; then, two glue-injected arch bridges are arranged in parallel on the left side of the flux box body to form a double arch bridge structure, one glue-injected arch bridge spans between the first sealing groove and the second sealing groove, and the other glue-injected arch bridge spans between the second sealing groove and the third sealing groove; then, the sealing box is placed on the left side of the flux box body to cover the double arch bridge structure and is horizontally arranged on the three round-shaped sealing grooves, and the sealing strip snap-in at the bottom rectangular edge of the sealing box is matched and connected with the corresponding sealing groove; finally, glue is injected into the three round-shaped sealing grooves through the glue injection hole, and after the glue is air-dried, a preservative film 7 is covered in the three sealing grooves 7. Since the sealing box is not large, with dimensions of 50×20×20 (cm), the operator can use a long rod-like object to pass the plastic wrap through the front and rear sealing bayonet of the sealing box, spread the plastic wrap evenly, and then inject water from the double arch bridge to form a "water pressure seal" to achieve sealing.

[0035] By applying the present invention, the operator can use the RA-915+ mercury analyzer for detection. During measurement, the flux box is placed at the sample point to be measured, and a polytetrafluoroethylene pipeline is used to connect the box to an automatic mercury analyzer (such as Tekran2537A). The total gaseous mercury concentration inside and outside the box is collected alternately using the two mercury collection tubes A and B of Tekran2537A, sampling for 5 minutes, and then analyzed and determined using cold steam atomic fluorescence spectrometry. In order to eliminate the system errors of the two tubes A and B, the measurement time of the atmospheric mercury content at the inlet and outlet of the box is 10 minutes, respectively, and a flux value is obtained every 20 minutes. At the same time, the flux box is continuously evacuated at a fixed flow rate using a vacuum pump to keep the air flow in the box at 0.9m3·h-1, so as to avoid the influence of changes in air flow rate on the flux measurement (references 1 and 2). During measurement, one end is connected to the LUMEX ZeemanRA-915+ mercury analyzer with a polytetrafluoroethylene tube, and the other end is connected to the atmosphere. The sampling flow rate is 20L·min -1 , detection frequency 1Hz, continuous sampling for 10 to 20 minutes each time, alternating sampling every 5 minutes inside and outside the box, and calculating the average flux of 20 minutes (references 3 and 4). According to the law of conservation of mass, the calculation formula is:

[0036] F=(c0-c i )×Q÷A

[0037] Where F is the mercury release flux, ng·(m 2 h) -1 ; c0 is the gaseous mercury content outflowing from the box, ng·m -3 ;ci is the gaseous mercury content entering the chamber, ng·m -3 ; Q is the air velocity in the box, m 3 ·h -1 ; A is the bottom area of ​​the box, m 2 .

[0038] During the implementation process, the operator can increase or decrease the amount of glue used according to the speed of colloid diffusion and solidification into solid, so as to seal the flux box. The operator does not need to check the device regularly. At night, check the waterproofness of the ground moisture-recovery glue and increase the amount of glue appropriately to prevent air from entering the flux box.

[0039] In summary, the present invention has many significant innovations and advantages:

[0040] First, the glue injection arch bridge has a novel design, which can realize glue injection at both ends of the arch bridge, improve the glue injection efficiency, and the two arch bridges share a gap of the sealing strip, which reduces the use of the sealing strip. At the same time, each arch bridge is also provided with a glue injection groove, which is similar to a slide and allows the glue to stay on the arch bridge to the greatest extent, without causing glue waste. This invention is the first to combine the ingenious design of the arch bridge structure with the flux box, which is full of creativity and originality.

[0041] Second, three seals are formed with sealing strips. The present invention uses the most common door and window sealing strips (high fixed, length can be adjusted at will) to seal the flux box, which can save costs to a great extent. At the same time, the three seals can ensure the sealing of the flux box to the greatest extent, so that the outside air cannot enter the flux box. The design of the three-way round-shaped sealing groove is borrowed from the inner and outer circles of the playground runway. The idea is very novel and successfully combines reality with scientific research.

[0042] Thirdly, polyurethane glue was chosen as the sealing glue instead of other glues because it has good elasticity and tensile properties, and is wear-resistant, cold-resistant and oil-resistant; it has high thixotropy, and even when used on a vertical surface or on the top, it will be very stable and will not flow and affect the use effect; it is non-corrosive to other materials; it has strong aging resistance; it has good adhesion and sealing properties to metal, marble, ceramics, glass, cement products, wood and most plastic products.

[0043] Fourth, the flux box is made of plexiglass, which has the advantage over other materials in that plexiglass has a transmittance comparable to that of glass, but its density is only half that of glass. In addition, it is not as fragile as glass, and even if it is damaged, it will not form sharp fragments like glass; plexiglass has excellent weather resistance, high surface hardness and surface gloss, and good high temperature performance; this material has high light transmittance, so the static box made of this material can ensure that the inside of the box obtains sufficient light from the outside of the box, while also ensuring the gas sealing of the experimental environment inside the box to ensure the purity of the gas to be sampled in the experiment; it has good thermal insulation and can reflect infrared rays to achieve the purpose of blocking heat loss.

[0044] Fifth, the top surface of the sealing box is provided with a glue injection hole, which improves the convenience of glue injection. At the same time, the existence of the sealing box can make the flux box more sealed and provide support for the sealing strip. The size and structure of the sealing box are compact and easy to carry. Corresponding bayonet holes are also designed on the sealing box where the sealing strip needs to pass, ensuring that the sealing strip can pass through the sealing box smoothly and surround the flux box.

[0045] Sixth, the present invention adopts the method of "water pressure glue sealing" to seal the flux box, uses plastic wrap to separate water and glue, and then uses the weight of the water to compact the glue under the plastic wrap, which can seal the flux box to the greatest extent. The design idea is ingenious and unique, and the gaps of the three circular sealing grooves from the inside to the outside are 5cm, 4cm, and 3cm respectively, which are progressive layer by layer.

[0046] Seventh, the present invention adopts materials commonly found in life, which can save costs while ensuring the integrity of the device. It can also allow the experiment of measuring the mercury exchange flux between the urban hard ground and the atmospheric interface to proceed smoothly, thereby improving the economic benefits of the entire device.

[0047] References:

[0048] [] Wang Shaofeng, Feng Xinbin, Qiu Guangle. Comparison of exchange flux of gaseous mercury between soil and atmosphere in cold and warm seasons in Hongfeng Lake area of ​​Guizhou Province [J]. Environmental Science, 2004, 25(1): 123-127.

[0049] [2] Hou Yamin, Feng Xinbin, Wang Shaofeng, et al. Preliminary study on mercury exchange flux between soil and air interface in Guiyang and its suburbs [J]. Acta Pedologica Sinica, 2005, 42(1): 52-58

[0050] [3] Liu Xiao, Zhang Cheng, Zhu Jinshan, et al. Effects of soil moisture and watering on mercury release flux from purple soil-air interface [J]. Environmental Chemistry, 2011, 30(8): 1509-1513.

[0051] [4] Lin Tao, Zhang Cheng, Shi Xiaojun, et al. Mercury release flux from soil / air interface of different types of purple soil and its influencing factors [J]. Journal of Environmental Science, 2008, 28(10): 1955-1960.

Claims

1. A material flux box suitable for non-soil ground monitoring, characterized in that It mainly includes a flux box body, a sealing box and a glue injection arch bridge; the flux box body and the sealing box are both rectangular boxes with bottom openings, and the rectangular boxes are both made of organic glass; a glue injection hole is provided on the top surface of the sealing box, and a sealing strip bayonet is provided on the bottom rectangular edge of the sealing box.

2. The material flux box according to claim 1, characterized in that It also includes three round-shaped sealing grooves located on the same plane from the inside to the outside, and the flux box body and the lower bottom of the sealing box are located on the plane; the first sealing groove is surrounded by a sealing strip along the outer rectangular edge of the lower bottom of the flux box body; the second sealing groove is located outside the first sealing groove and is surrounded by the distance between two sealing strips; the third sealing groove is located outside the second sealing groove and is surrounded by the distance between two sealing strips; the sealing box is located on the left side of the flux box body and is horizontally arranged on the three round-shaped sealing grooves, and corresponding sealing strip snap-ons are respectively opened at the connection between the bottom rectangular edge of the sealing box and the sealing groove.

3. The material flux box according to claim 2, characterized in that: The glue injection arch bridge is in the shape of an arch bridge, and is made of organic glass. A glue injection groove is arranged on the upper surface of the arch bridge from one end to the other end.

4. The material flux box according to claim 3, characterized in that: There are two injection arch bridges, which are arranged side by side in the sealing box to form a side by side double arch bridge structure. One injection arch bridge spans between the first sealing groove and the second sealing groove, and the other injection arch bridge spans between the second sealing groove and the third sealing groove.

5. The material flux box according to claim 4, characterized in that: The top surface of the sealing box is provided with a glue injection hole corresponding to the position of the glue injection arch bridge.

6. The material flux box according to claim 5, characterized in that: The size of the flux box body is 40cm×40cm×100cm, the size of the sealing box is 50cm×20cm×20cm, the size of the injection arch bridge is a radius of 10.75cm and a height of 18cm; the widths of the three circular sealing grooves are 5cm, 4cm, and 3cm from inside to outside, respectively.

7. The material flux box according to claim 1 is used for measuring the mercury exchange flux between the urban ground and the atmosphere interface.

8. A method for measuring the mercury exchange flux between the urban ground and the atmosphere interface, characterized in that The method is carried out using the material flux box as claimed in claim 1.

9. The measuring method according to claim 8, characterized in that: First, place the flux box body on the ground plane, and use a sealing strip to surround the outer edge of the lower rectangular bottom of the flux box body to form a first sealing groove; then, outside the first sealing groove, the second sealing groove is surrounded by the spacing between two sealing strips, and the third sealing groove is surrounded in the same way; then, two glue-injected arch bridges are arranged side by side on the left side of the flux box body to form a double-arch bridge structure, one glue-injected arch bridge spans between the first sealing groove and the second sealing groove, and the other glue-injected arch bridge spans between the second sealing groove and the third sealing groove; then, place the sealing box on the left side of the flux box body to cover the double-arch bridge structure and horizontally on the three round-shaped sealing grooves, and the sealing strip snap-on at the bottom rectangular edge of the sealing box matches and connects with the corresponding sealing groove; finally, glue is injected into the three round-shaped sealing grooves through the glue injection hole, and after the glue injection is completed, a plastic wrap is covered on the glue in the sealing groove, and water is injected from the glue-injected arch bridge to form a "water pressure glue seal" to achieve sealing.

10. The measuring method according to claim 9, characterized in that: The glue injection adopts polyurethane glue.

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