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PM2.5 (Particular Matter 2.5) single-grade atmosphere sampling cutter

A technology of atmospheric sampling and cutter, which is applied in the direction of sampling devices, etc., can solve the problems of small size, inability to achieve classified collection of particulate matter, and inability to meet the sample volume of granular POPs, and achieve the effect of precise stratification and precise particle size cutting

Inactive Publication Date: 2014-09-03
FOSHAN ENVIRONMENTAL PROTECTION TECH & EQUIP RES DEV PROFESSIONAL CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MOUDIMMI, Andersen eight-stage impact sampler, and Sioutas Cascade Impactor (SKC), which are commonly used in the world, have a flow rate of only 9L / min-90L / min and a small volume, which is far from meeting the requirements for particle POPs analysis. sample size
In addition, none of these samplers can simultaneously collect gaseous POPs
The more commonly used large-flow samplers in the study of atmospheric POPs, such as Tisch Environmental, Thermo Scientific, and Digitel, can simultaneously collect particulate and gaseous pollutants, but the collected particles are basically total suspended particles (TSP). Classified collection of particulate matter cannot be achieved

Method used

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  • PM2.5 (Particular Matter 2.5) single-grade atmosphere sampling cutter
  • PM2.5 (Particular Matter 2.5) single-grade atmosphere sampling cutter
  • PM2.5 (Particular Matter 2.5) single-grade atmosphere sampling cutter

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Effect test

Embodiment 1

[0040] In this example, a monodisperse aerosol with specific particle size generated by a monodisperse aerosol generator is selected as a sample, and the sampling flow rate is 300 L / min.

[0041] Table 1

[0042] Particle size (μm) 1.7 2.1 2.3 2.5 2.7 3.0 Efficiency n (%) 15.5 23.7 42.6 53.1 79.5 94.2

[0043] From the test data in Table 1, it can be obtained as Figure 4 shown in the chart.

[0044] Referring to the PM10 sampling technical requirements and detection methods of the State Environmental Protection Administration, the particle capture performance of the sampler has a polynomial regression equation expressed as n=A+Bd p +Cd p 2 +Dd p 3 , the linear regression equation of the capture efficiency can be obtained from the data in Table 1: n=912.98-1231d p +536.8d p 2 -72.457d p 3 .

[0045] From this regression equation, it can be found that when n is 50, d 50 =2.42 um, the absolute error with the 2.5 um actually required by...

Embodiment 2

[0047] In this embodiment, the urban area of ​​Guangzhou is used as the experimental area, and the present invention is used to collect volatile organic compounds. After the test of the present invention, the experimental data of the content of volatile organic compounds collected by the gaseous POPs collection layer are shown in Table 2.

[0048]

[0049] According to the inspection data in Table 2, it can be known that the polyurethane foam (PUF) on the upper layer can effectively adsorb gaseous POPs, while the polyurethane foam (PUF) on the lower layer can further check and re-adsorb gaseous POPs, in which dihydrogen Organic substances such as acenaphthene, fluorene, anthracene, fluoranthene, benz[a]anthracene, and chrysene have been completely absorbed in the upper layer of the polyurethane foam (PUF), while acenaphthene, phenanthrene, and pyrene are only absorbed after passing through the upper layer of the polyurethane foam (PUF). The remaining traces can be completel...

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Abstract

The invention discloses a PM2.5 (Particular Matter 2.5) single-grade atmosphere sampling cutter. The PM2.5 single-grade atmosphere sampling cutter is roughly cylindrical; the PM2.5 single-grade atmosphere sampling cutter comprises a cutting opening cover layer, an impacting nozzle layer, an impacting plate layer, a particular matter collecting layer, a gas organic pollutant collecting layer and a gas discharging layer, wherein the cutting opening cover layer, the impacting nozzle layer, the impacting plate layer, the particular matter collecting layer, the gas POPs (Persistent Organic Pollutants) collecting layer and the gas discharging layer are sequentially sealed and connected in series; the impacting nozzle layer comprises impacting nozzles and an impacting nozzle plate; the impacting nozzles are arrayed at an equal interval and are vertically inserted into the impacting nozzle plate to form an annular ring; the impacting nozzles are internally provided with reversed conical through holes; and the impacting plate layer is provided with an impacting plate and the impacting plate is an annular groove. With the adoption of the PM2.5 single-grade atmosphere sampling cutter disclosed by the invention, the characteristic that a previous air sampling device has middle and small flow is broken through; and a flow design standard of 300 L / min can meet the POPs sampling requirements so that the cutting grain diameter of the cutter is accurate and the target of accurately layering the target particular matters under the cutting of an inertia impacting force can be realized.

Description

technical field [0001] The invention relates to the field of ambient air collection and monitoring, in particular to a PM2.5 single-stage air sampling cutter. Background technique [0002] The atmospheric environment has a vital impact on people's life and health, so the monitoring of particulate matter in the atmospheric environment is also particularly important. For a period of time, PM10 inhalable particulate matter has been the focus of monitoring the atmospheric environment, while PM2.5 fine particulate matter is mainly collected for scientific research, so currently routinely used fine particle samplers are all small flow. However, with the deepening of scientific research, people have a better understanding of the physical and chemical properties of fine particles, and found that these particles with an aerodynamic diameter of less than 2.5 μm have a greater impact on the human respiratory system. Because the fine particles suspended in the air often adsorb some sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/22
Inventor 李军张干邹世春
Owner FOSHAN ENVIRONMENTAL PROTECTION TECH & EQUIP RES DEV PROFESSIONAL CENT
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