On-site detection device for nitrogen oxides in air

Abstract

The utility model relates to an on-site detection device for nitrogen oxides in air, which comprises reagents, consumables, tools and instruments which are arranged in a box body, and is characterized in that a pretreatment area and a colorimetric area are arranged in the box body, the pretreatment area is provided with a first base, and the first base is provided with a sample tube socket, a standby tube socket, a washing bottle seat, an ear washing bulb storage position and a dropper bin; the colorimetric area comprises a reagent consumable area and an instrument station, the reagent consumable area is provided with a second base, the second base is provided with an absorption liquid bottle storage position, a quality control sample storage position, a waste liquid recovery bottle seat and a sampling control colorimetric card bin, and the spectrophotometer is placed on the instrument station. By adopting the portable spectrophotometer, the built-in curve error in the portable spectrophotometer is firstly confirmed to be within the range, and then the portable spectrophotometer goes out to the field to carry out detection work. The device is simple in structure, low in cost, easy to carry, convenient to operate, high in detection efficiency and accurate in result.

Description

Technical Field

[0001] This utility model relates to occupational health monitoring, specifically to an on-site detection device for nitrogen oxides in the air. Background Technology

[0002] Occupational health research involves identifying, assessing, predicting, and controlling occupational hazards and their health damage that arise or exist in the workplace. Its purpose is to protect workers' rights, improve safety and health during production processes, and prevent harm from harmful factors. Nitrogen oxide detection is one of the most common indicators in occupational health monitoring.

[0003] According to standards, nitrogen oxide testing in the occupational health field requires same-day determination, necessitating high timeliness. Current nitrogen oxide testing methods rely on on-site sampling and laboratory measurement. For long-distance sampling, methods such as outsourced testing or sample mailing are often used to meet timeliness requirements. Outsourced testing involves numerous management regulations and documentation requirements, including agreements, qualification verification of the outsourcing unit, and written consent from the tested unit, significantly increasing the workload of laboratories. Furthermore, some prefecture-level cities lack qualified testing institutions for outsourced testing, necessitating sample mailing. Occupational health sampling typically covers a work shift, ending around 5 or 6 PM, requiring testing personnel to be on call 24 hours a day to ensure sample validity upon delivery. Outsourced testing not only increases laboratory management workload but also incurs additional outsourced testing fees. Sample mailing requires 24-hour laboratory staff on standby, with samples processed immediately upon arrival, often involving overtime, further increasing mailing and overtime costs and workload for laboratory personnel. This not only increases testing costs but is also time-consuming and labor-intensive.

[0004] To address the aforementioned shortcomings of existing technologies, this utility model proposes an on-site detection device for nitrogen oxides in the air that is simple in structure, low in cost, easy to carry, convenient to operate, highly efficient, and accurate. Utility Model Content

[0005] The purpose of this invention is to provide an on-site detection device for nitrogen oxides in the air that is simple in structure, low in cost, easy to carry, convenient to operate, highly efficient, and accurate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A field detection device for nitrogen oxides in air includes a housing, a lid, an ultrapure water washing bottle, a syringe bulb, disposable droppers, sample tubes, spare tubes, an absorption bottle, a quality control sample bottle, a sampling control colorimetric card, a waste liquid recovery bottle, and a portable spectrophotometer. The housing and lid are hinged together. The housing contains a pretreatment area and a colorimetric area. The pretreatment area has a first base with 12-20 sample tube sockets, 2-4 spare tube sockets, a washing bottle holder, a syringe bulb storage area, and a dropper compartment. Sample tubes are inserted into their respective sockets, and spare tubes are inserted into their respective spare tube sockets. The ultrapure water washing bottle is placed on the washing bottle holder, and the syringe bulb is placed in the syringe bulb storage area. Disposable droppers... The tubes are placed in the dropper compartment; the colorimetric area includes a reagent and consumables area and an instrument station. The reagent and consumables area is equipped with a second base, which has a storage area for absorption liquid bottles, a storage area for quality control samples, a waste liquid recovery bottle holder, and a sampling control colorimetric card compartment. Absorption liquid bottles are placed in the absorption liquid bottle storage area, quality control sample bottles are placed in the quality control sample storage area, and waste liquid recovery bottles are placed on the waste liquid recovery bottle holder. The sampling control colorimetric card is arranged with 0.00μg, 0.25μg, 0.50μg, 1.00μg, 1.50μg, 2.50μg, and 3.50μg color cards. The sampling control colorimetric card is placed in the sampling control colorimetric card compartment. The portable spectrophotometer is placed on the instrument station.

[0008] Furthermore, the first base is provided with 16 sample tube sockets and 2 spare tube sockets.

[0009] Furthermore, the cap that mates with the ultrapure water washing bottle is a sealing cap or a curved cap.

[0010] Furthermore, the portable spectrophotometer has a built-in standard curve module, which is preset with a standard curve for nitrogen oxide content of 0-3.5 μg; the portable spectrophotometer has a nitrogen oxide standard curve recall button on its operating surface.

[0011] Furthermore, the portable spectrophotometer has a button for converting nitrogen oxide content detection results on its operating surface.

[0012] The working process of this utility model is as follows:

[0013] Prepare disposable droppers, sample tubes, ultrapure water, absorption liquid, and quality control samples according to the occupational health field survey and sampling and measurement plan for the required number of nitrogen oxides (NOx) to be detected. Ultrapure water wash bottles should be fitted with a sealed cap during normal use and a bent-nose cap during operation. After subtracting the blank with the absorption liquid, use the quality control sample to check the error of the built-in curve in the portable spectrophotometer. If the error is within the acceptable range, field testing can proceed; otherwise, the built-in curve needs to be reset before field testing. Sampling NOx is performed against the colorimetric card. Sampling is stopped when the color of the absorption liquid falls within the colorimetric card's range. Wash the inner wall of the inlet tube three times with the sampled absorption liquid using a disposable dropper, then transfer the NOx sample to the sample tube using a syringe rubber bulb. Following the portable spectrophotometer's operating instructions, perform colorimetric analysis on the NOx sample and quality control sample after subtracting the blank with the absorption liquid. During colorimetric analysis, utilize the built-in standard curve module and result conversion function of the portable spectrophotometer, which has a preset NOx content of 0-3.5 μg, to directly calculate the NOx content.

[0014] Advantages and effects of this utility model:

[0015] This utility model is a field testing kit designed strictly in accordance with testing standards and references laboratory testing procedures. The ultrapure water wash bottle of this utility model is a laboratory-specific wash bottle equipped with a screw cap, facilitating switching between transportation and experimental use, and is easy to carry. Absorption solutions and quality control samples can be prepared in advance, significantly reducing the time spent on blank deduction and curve verification during on-site testing, thereby improving testing efficiency. The sampling control colorimetric card avoids the need for dilution when sample concentration exceeds the measurement range, saving sample pretreatment time. The portable spectrophotometer has a built-in and calibrated nitrogen oxide standard curve before sampling, allowing direct calculation of nitrogen oxide content based on absorbance, making operation convenient and results accurate.

[0016] This invention not only solves the problem of expired samples for nitrogen oxide detection in the field of occupational health over long distances, but also reduces expenses such as sample delivery, sample shipping, and overtime costs, thereby reducing the workload of laboratory personnel who do not need to be on call 24 hours a day. At the same time, it can also provide a methodological basis for on-site testing for occupational health supervision and inspection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a top view of the box body of this utility model;

[0019] Figure 3 This is a schematic diagram of the first base structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the second base structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the ultrapure water washing bottle and sealing cap of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the ultrapure water washing bottle and the curved cap of this utility model;

[0023] Figure 7 This is a schematic diagram of the spectrophotometer structure of this utility model;

[0024] Figure 8 This is a schematic diagram of the sampling control colorimetric card.

[0025] In the diagram: 1-Box body; 1.1-Pretreatment area; 1.2-Colorimetric area; 1.2.1-Reagent and consumable area; 1.2.2-Instrument station; 2-Box lid; 3-Ultrapure water wash bottle; 3.1-Sealing cap; 3.2-Bent nozzle cap; 4-Swipe bulb; 5-Disposable dropper; 6-Sample tube; 7-Spare tube; 8-Absorption solution bottle; 9-Quality control sample bottle; 10-Sampling control colorimetric card; 10.1-0.00μg color card; 10.2-0.25μg color card; 10.3-0.50μg color card; 10.4-1.00μg color card; 10.5-1.50μg color card; 10. 6-2.50μg color chart; 10.7-3.50μg color chart; 11-Waste liquid recovery bottle; 12-Portable spectrophotometer; 12.1-Nitrogen oxide standard curve recall button; 12.2-Nitrogen oxide content detection result conversion button; 13-First base; 13.1-Sample tube socket; 13.2-Spare tube socket; 13.3-Water wash bottle holder; 13.4-Swipe bulb storage area; 13.5-Dropper compartment; 14-Second base; 14.1-Absorption liquid bottle storage area; 14.2-Quality control sample storage area; 14.3-Waste liquid recovery bottle holder; 14.4-Sampling control color chart compartment. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but these embodiments should not be construed as limiting the present invention.

[0027] The figure shows an on-site detection device for nitrogen oxides in the air, comprising a housing 1, a lid 2, an ultrapure water washing bottle 3, a syringe bulb 4, a disposable dropper 5, a sample tube 6, a spare tube 7, an absorption liquid bottle 8, a quality control sample bottle 9, a sampling control colorimetric card 10, a waste liquid recovery bottle 11, and a portable spectrophotometer 12. The housing 1 and the lid 2 are connected by a hinge. The housing 1 is equipped with a pretreatment area 1.1 and a colorimetric area 1.2. The pretreatment area 1.1 is equipped with a first base 13. The base 13 is equipped with 12-20 sample tube sockets 13.1, 2-4 spare tube sockets 13.2, a water wash bottle holder 13.3, a syringe bulb storage area 13.4, and a dropper compartment 13.5. Sample tubes 6 are inserted into each sample tube socket 13.1, spare tubes 7 are inserted into each spare tube socket 13.2, ultrapure water wash bottles 3 are placed on the water wash bottle holder 13.3, syringe bulbs 4 are placed in the syringe bulb storage area 13.4, and disposable droppers 5 are placed in the dropper compartment 13.5; Color area 1.2 includes reagent and consumable area 1.2.1 and instrument station 1.2.2. Reagent and consumable area 1.2.1 is equipped with a second base 14, which includes an absorption liquid bottle storage area 14.1, a quality control sample storage area 14.2, a waste liquid recovery bottle holder 14.3, and a sampling control colorimetric card compartment 14.4. Absorption liquid bottles 8 are placed in absorption liquid bottle storage area 14.1, quality control sample bottles 9 are placed in quality control sample storage area 14.2, and waste liquid recovery bottles 11 are placed in waste liquid recovery bottle holders. On stand 14.3, 0.00μg color card 10.1, 0.25μg color card 10.2, 0.50μg color card 10.3, 1.00μg color card 10.4, 1.50μg color card 10.5, 2.50μg color card 10.6 and 3.50μg color card 10.7 are arranged on sampling control color card 10. Sampling control color card 10 is placed in sampling control color card compartment 14.4. Portable spectrophotometer 12 is placed on instrument station 1.2.2.

[0028] A preferred embodiment is that, in the above scheme, the first base 13 is provided with 16 sample tube sockets 13.1 and 2 spare tube sockets 13.2.

[0029] A preferred embodiment is that, in the above scheme, the cap that mates with the ultrapure water washing bottle 3 is a sealing cap 3.1 or a curved cap 3.2.

[0030] A preferred embodiment is as follows: In the above scheme, the portable spectrophotometer 12 has a built-in standard curve module, which is a preset standard curve with a nitrogen oxide content of 0-3.5 μg; the operating surface of the portable spectrophotometer 12 is provided with a nitrogen oxide standard curve recall button 12.1.

[0031] A preferred embodiment is that, in the above scheme, the operating surface of the portable spectrophotometer 12 is provided with a nitrogen oxide content detection result conversion button 12.1.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. An on-site device for detecting nitrogen oxides in air, comprising a box (1), a box cover (2), an ultrapure water washing bottle (3), an ear washing ball (4), a disposable dropper (5), a sample tube (6), a standby tube (7), an absorbent liquid bottle (8), a quality control sample bottle (9), a sampling control color card (10), a waste liquid recovery bottle (11) and a portable spectrophotometer (12), characterized in that: The box body (1) and the box cover (2) are connected by hinges. The box body (1) is provided with a pretreatment area (1.1) and a colorimetric area (1.2). The pretreatment area (1.1) is provided with a first base (13). The first base (13) is provided with 12-20 sample tube sockets (13.1), 2-4 spare tube sockets (13.2), a water washing bottle holder (13.3), a syringe bulb storage area (13.4), and a dropper compartment (13.5). The sample tubes (6) are respectively inserted into Each sample tube socket (13.1) and spare tube (7) are inserted into their respective spare tube sockets (13.2). The ultrapure water wash bottle (3) is placed on the wash bottle holder (13.3). The wash bulb (4) is placed in the wash bulb storage area (13.4). The disposable dropper (5) is placed in the dropper compartment (13.5). The colorimetric area (1.2) includes the reagent and consumables area (1.2.1) and the instrument station (1.2.2). The reagent and consumables area (1.2.1) is equipped with a second base (1). 4) The second base (14) is equipped with an absorption liquid bottle storage area (14.1), a quality control sample storage area (14.2), a waste liquid recovery bottle holder (14.3), and a sampling control colorimetric card compartment (14.4). The absorption liquid bottle (8) is placed in the absorption liquid bottle storage area (14.1), the quality control sample bottle (9) is placed in the quality control sample storage area (14.2), the waste liquid recovery bottle (11) is placed on the waste liquid recovery bottle holder (14.3), and a 0.0 oz sample is placed on the sampling control colorimetric card (10). 0μg color card (10.1), 0.25μg color card (10.2), 0.50μg color card (10.3), 1.00μg color card (10.4), 1.50μg color card (10.5), 2.50μg color card (10.6) and 3.50μg color card (10.7), sampling control color card (10) is placed in sampling control color card compartment (14.4), and portable spectrophotometer (12) is placed on instrument station (1.2.2).

2. The device for on-site detection of nitrogen oxides in air according to claim 1, characterized in that: The first base (13) is provided with 16 sample tube sockets (13.1) and 2 spare tube sockets (13.2).

3. The device for on-site detection of nitrogen oxides in air according to claim 1 or 2, characterized in that: The cap that mates with the ultrapure water washing bottle (3) is a sealing cap (3.1) or a curved cap (3.2).

4. The on-site detection device for nitrogen oxides in air according to claim 1 or 2, characterized in that: The portable spectrophotometer (12) has a built-in standard curve module, which is preset with a standard curve for nitrogen oxide content of 0-3.5 μg; the portable spectrophotometer (12) has a nitrogen oxide standard curve recall button (12.1) on its operating surface.

5. The on-site detection device for nitrogen oxides in air according to claim 3, characterized in that: The portable spectrophotometer (12) has a built-in standard curve module, which is preset with a standard curve for nitrogen oxide content of 0-3.5 μg; the portable spectrophotometer (12) has a nitrogen oxide standard curve recall button (12.1) on its operating surface.

6. The on-site detection device for nitrogen oxides in air according to claim 4, characterized in that: The portable spectrophotometer (12) has a nitrogen oxide content detection result conversion button (12.2) on its operating surface.

7. The on-site detection device for nitrogen oxides in air according to claim 5, characterized in that: The portable spectrophotometer (12) has a nitrogen oxide content detection result conversion button (12.2) on its operating surface.

Images