An atmospheric pollutant detection device based on colorimetry
By designing a portable air pollutant detection device and adopting an anti-backflow device and a flow rate control system, the problem of inaccurate detection results in existing technologies has been solved, achieving accurate on-site detection of pollutants and ensuring the safety of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ENVIRONMENTAL ENG TECH CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-06-16
AI Technical Summary
Existing colorimetric-based air pollutant detection devices are difficult to achieve accurate on-site detection, especially for formaldehyde, where the detection results are inaccurate.
An atmospheric pollutant detection device was designed, comprising a sample introduction system, an absorption system, and a detection system. It employs an anti-backflow device and a flow rate control system, combined with an ultraviolet-visible light detector, to achieve precise flow rate control and a safe and convenient detection process.
It enables accurate detection of portable on-site pollutants, improves the repeatability and safety of detection results, and ensures the long-term convenience of the device.
Smart Images
Figure CN224365963U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of atmospheric pollutant detection technology, and in particular relates to an atmospheric pollutant detection device based on colorimetric method. Background Technology
[0002] Colorimetric methods are a common approach for detecting air pollutants. For example, formaldehyde is detected by absorption with phenol reagent, nitrogen oxides by absorption with naphthylethylenediamine hydrochloride, and hydrogen sulfide by absorption with methylene blue. Compared to other methods, colorimetric methods are convenient, fast, and cost-effective, and can be used to detect characteristic substances individually.
[0003] Currently, there are few colorimetric detection devices applicable to a variety of air pollutants, making it difficult to detect them at the pollution site. For example, formaldehyde is usually detected by passive absorption, which leads to inaccurate test results. Summary of the Invention
[0004] To address the aforementioned problems in the existing technology, this application provides an air pollutant detection device based on colorimetry, which can achieve convenient and accurate detection of air pollutants such as formaldehyde and hydrogen sulfide.
[0005] To achieve the above objectives, the technical solution provided in this application is as follows:
[0006] This application provides a colorimetric-based atmospheric pollutant detection device, comprising a sample introduction system, an absorption system, a detection system, and a detection chamber. The sample introduction system includes a flow rate control system and a sample introduction pump. An air inlet pipe is connected to the inlet end of the sample introduction pump through the flow rate control system, and the outlet end of the sample introduction pump is connected to the absorption system through an anti-backflow device. The detection system includes an ultraviolet-visible light detector, which is used to detect the ultraviolet-visible signal of the absorption system. The sample introduction system, absorption system, detection system, and controller are all arranged in the detection chamber, which is openable and closable.
[0007] Optionally, the absorption system includes an absorption bottle containing an absorbent liquid. The anti-backflow device is equipped with a second connecting pipe, the outlet end of which is inserted into the absorbent liquid. The absorption bottle is connected to the outside through an exhaust pipe.
[0008] Optionally, a bubbler is provided at the end of the second connecting tube, and the bubbler is arranged in the absorbent liquid.
[0009] Optionally, the anti-backflow device includes an anti-backflow bottle, and the sample pump is connected to the inner cavity of the anti-backflow bottle through a first connecting pipe. The outlet end of the first connecting pipe and the inlet end of the second connecting pipe are both located at the top of the inner cavity of the anti-backflow bottle.
[0010] Optionally, the anti-backflow bottle can be detachably connected to both the first and second connecting pipes, and the absorption bottle can be detachably connected to both the second connecting pipe and the exhaust pipe.
[0011] Optionally, the first connecting pipe, the second connecting pipe, and the exhaust pipe each include a rigid pipe section and a flexible pipe section connected to the rigid pipe section. The flexible pipe section is sleeved on the rigid pipe section, and the inlet and outlet positions of the absorption bottle and the anti-backflow bottle are both provided with rigid pipe sections.
[0012] Optionally, a one-way valve is installed on each of the rigid pipe sections.
[0013] Optionally, it also includes a controller, which is connected to the flow rate control system, the injection pump, the absorption system, and the detection system.
[0014] Optionally, the testing box is equipped with a control panel.
[0015] Optionally, the flow rate control system includes a control valve.
[0016] Compared with the prior art, this application has at least the following beneficial effects:
[0017] This application presents a colorimetric atmospheric pollutant detection device that is simple and portable, facilitating accurate on-site detection of pollutants. An anti-backflow device ensures safety during use. A flow rate control system enables precise flow rate regulation, ensuring repeatability of detection results and improving accuracy.
[0018] In this application, by setting rigid pipe sections at the inlet and outlet of the absorption bottle and sleeve the flexible pipe section on the rigid pipe section, the absorption bottle is easy to replace, which facilitates the long-term use of the device. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the detection box structure of an air pollutant detection device based on colorimetry, as described in an embodiment of this application.
[0021] Figure 2 This is a schematic diagram of the internal structure of the detection box of an air pollutant detection device based on colorimetry, as described in an embodiment of this application.
[0022] Explanation of reference numerals in the attached figures:
[0023] 1. Inlet pipe; 11. Flow rate control system; 2. Sample pump; 3. Anti-backflow device; 31. First connecting pipe; 32. Second connecting pipe; 311. Rigid pipe section; 312. Flexible pipe section; 313. One-way valve; 33. Bubble blower; 4. Absorption system; 41. Exhaust pipe; 5. Detection system; 6. Detection box; 61. Inlet; 62. Outlet; 63. Control panel. Detailed Implementation
[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.
[0025] Example 1
[0026] like Figures 1-2 As shown, an air pollutant detection device based on colorimetry includes a sample introduction system, an absorption system 4, a detection system 5, and a detection chamber 6. The sample introduction system includes a flow rate control system 11 and a sample pump 2. The inlet pipe 1 is connected to the inlet end of the sample pump 2 through the flow rate control system 11, and the outlet end of the sample pump 2 is connected to the absorption system 4 through an anti-backflow device 3. The detection system 5 includes an ultraviolet-visible light detector, which is used to detect the ultraviolet-visible signal of the absorption system 4. The sample introduction system, absorption system 4, detection system 5, and controller are all arranged in the detection chamber 6, which can be opened and closed to facilitate the removal of the absorption system and the anti-backflow device.
[0027] The colorimetric atmospheric pollutant detection device proposed in this application is simple and portable, facilitating accurate on-site detection of pollutants. The anti-backflow device 3 ensures safety during device use. The flow rate control system 11 enables precise flow rate regulation, ensuring repeatability of detection results and improving detection accuracy.
[0028] Example 2
[0029] The difference between this embodiment and Embodiment 1 is that: the absorption system 4 includes an absorption bottle containing an absorption liquid, and an exhaust pipe 41 is inserted into the absorption bottle, with the inlet end of the exhaust pipe 41 located at the top of the inner cavity of the absorption bottle; the anti-backflow device 3 is provided with a second connecting pipe 32, the outlet end of which is inserted into the absorption liquid. The detection box 6 is provided with an air inlet 61 and an air outlet 62, the air inlet 61 being connected to the air inlet pipe 1, and the exhaust pipe 41 being connected to the air outlet 62, through which exhaust is performed.
[0030] A bubbler 33 is provided at the end of the second connecting pipe 32. The bubbler 33 is arranged in the absorption liquid. In this embodiment, the bubbler 33 is a sand core bubbler. The absorption efficiency of the absorption liquid on the sample gas is improved by the bubbler 33.
[0031] The anti-backflow device 3 includes an anti-backflow bottle. The sample pump 2 is connected to the inner cavity of the anti-backflow bottle through a first connecting pipe 31. The outlet end of the first connecting pipe 31 and the inlet end of the second connecting pipe 32 are both located at the top of the inner cavity of the anti-backflow bottle.
[0032] The anti-backflow bottle is detachably connected to both the first connecting pipe 31 and the second connecting pipe 32, and the absorption bottle is detachably connected to both the second connecting pipe 32 and the exhaust pipe 41. In this embodiment, the first connecting pipe 31, the second connecting pipe 32, and the exhaust pipe 41 each include a rigid pipe section 311 and a flexible pipe section 312 connected to the rigid pipe section 311. The flexible pipe section 312 is sleeved on the rigid pipe section 311. Rigid pipe sections 311 are provided at the inlet and outlet positions of both the absorption bottle and the anti-backflow bottle. By providing rigid pipe sections 311 at the inlet and outlet positions of the absorption bottle and sleeved the flexible pipe section 312 on the rigid pipe section 311, the absorption bottle is easy to replace, facilitating long-term use of the device.
[0033] One-way valves 313 are installed on all rigid pipe sections 311 to ensure one-way airflow and improve the accuracy of test results.
[0034] It also includes a controller. The detection box 6 is equipped with a control panel 63. The controller is connected to the flow rate control system 11, the injection pump 2, the absorption system 4, and the detection system 5. The controller is used to control the operation of each module (flow rate control system 11, injection pump 2, absorption system 4, and detection system 5) and transmit the flow rate of the flow rate control system 11 and the detection results to the control panel 63 for easy display of detection results and control operations.
[0035] In this embodiment, the flow rate control system 11 adopts the Bronkhorst mini CORI-FLOW series gas mass flow sensor; the injection pump 2 adopts the H&X Shanghai Hoya 6 L / min ultra-low vacuum pump.
[0036] Taking the use of the device in this embodiment to remove formaldehyde from indoor air as an example, the specific steps are as follows:
[0037] Open the detection chamber 6, remove the absorption bottle, and add a measured amount of phenol absorption solution, with a recommended volume range of 5-10 mL. The amount added should be consistent each time. After addition, reassemble the device. Specifically, in one embodiment, the absorption bottle is made of quartz, and 10 mL of phenol absorption solution with a concentration of 0.01 g / L is added.
[0038] The flow rate control system 11 and the sample pump 2 are controlled by the controller to extract indoor air at a fixed flow rate. To ensure the accuracy of the detection, it is recommended that the volume of the sampled gas exceed 10 L. Specifically, the flow rate is set to 5 L / min, and the extraction time is 2 minutes.
[0039] After the indoor air and the absorbent have reacted sufficiently, the ultraviolet-visible light detector is controlled by the controller to test the absorbance of the absorbent in the absorption bottle. The spectrum is then compared with the spectrum of the standard sample that has been tested and stored in advance to obtain the test results.
[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0041] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. An air pollutant detection device based on colorimetry, characterized in that, The system includes a sample introduction system, an absorption system, a detection system, and a detection chamber. The sample introduction system includes a flow rate control system and a sample pump. The inlet pipe is connected to the inlet end of the sample pump through the flow rate control system, and the outlet end of the sample pump is connected to the absorption system through an anti-backflow device. The detection system includes an ultraviolet-visible light detector, which is used to detect the ultraviolet-visible signal of the absorption system. The sample introduction system, absorption system, detection system, and controller are all arranged in the detection chamber, which can be opened and closed.
2. The air pollutant detection device based on colorimetry according to claim 1, characterized in that, The absorption system includes an absorption bottle containing an absorbent liquid. A second connecting pipe is provided on the anti-backflow device, with the outlet end of the second connecting pipe inserted into the absorbent liquid. The absorption bottle is connected to the outside through an exhaust pipe.
3. The air pollutant detection device based on colorimetry according to claim 2, characterized in that, The anti-backflow device includes an anti-backflow bottle, and the sample pump is connected to the inner cavity of the anti-backflow bottle through a first connecting pipe. The outlet end of the first connecting pipe and the inlet end of the second connecting pipe are both located at the top of the inner cavity of the anti-backflow bottle.
4. The air pollutant detection device based on colorimetry according to claim 3, characterized in that, The anti-backflow bottle is detachably connected to both the first and second connecting pipes, and the absorption bottle is detachably connected to both the second connecting pipe and the exhaust pipe.
5. The air pollutant detection device based on colorimetry according to claim 4, characterized in that, The first connecting pipe, the second connecting pipe, and the exhaust pipe all include a rigid pipe section and a flexible pipe section connected to the rigid pipe section. The flexible pipe section is sleeved on the rigid pipe section. Rigid pipe sections are provided at the inlet and outlet positions of the absorption bottle and the anti-backflow bottle.
6. The air pollutant detection device based on colorimetry according to claim 5, characterized in that, One-way valves are installed on all the rigid pipe sections.
7. The air pollutant detection device based on colorimetry according to claim 1, characterized in that, It also includes a controller, which is connected to the flow rate control system, the injection pump, the absorption system, and the detection system.
8. The air pollutant detection device based on colorimetry according to claim 7, characterized in that, The testing box is equipped with a control panel.
9. The air pollutant detection device based on colorimetry according to claim 1, characterized in that, The flow rate control system includes a control valve.
10. The air pollutant detection device based on colorimetry according to claim 2, characterized in that, A bubbler is provided at the end of the second connecting tube, and the bubbler is arranged in the absorbent liquid.