Air monitoring and classified sampling method and device

A technology of graded sampling and air monitoring, applied in sampling devices, preparation of test samples, etc., can solve the problems of inability to carry out in-depth analysis, inaccurate particle separation, inaccurate test results, etc., to facilitate composition and content analysis, collection, etc. The effect of improving efficiency and facilitating post-processing and analysis

Active Publication Date: 2012-07-18
WUHAN W E O SCI & TECH DEV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide an air monitoring hierarchical sampling method and device, which solves the problem of inaccurate separation of particles, inaccurate test results, difficult elution, inability to carry out in-depth analysis, cumbersome operation and use of existing air sampling methods and devices. Inconvenience and other issues

Method used

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  • Air monitoring and classified sampling method and device

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specific Embodiment

[0019] A PET polyester film was selected, irradiated with high-energy ions, and then subjected to appropriate chemical etching processes to prepare nuclear pore filters with three pore sizes of 10 μm, 2.5 μm, and 0.2 μm. Place the filter membranes of three pore sizes on the two layered joints and the porous double-tooth gasket on the base in order according to the pore size, press the O-ring on the membrane, the upper cover, the layered joint, and the base Seal the O-rings at each connection, connect and tighten the upper cover, the layered joint for placing the 10μm filter membrane, the layered joint for placing the 2.5μm filter membrane, and the base for placing the 0.2μm filter membrane in sequence, and then tighten the core hole The membrane filter is installed on the sampler, and the flow controller is adjusted so that the air enters the nuclear pore membrane filter at a flow rate of 5-15 L / min. Three sampling points were arbitrarily selected for sampling, and PM10 and PM...

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Abstract

The invention relates to an air monitoring and classified sampling method and a device. Through air suction, air with a certain flow velocity passes by nuclear pore filter membranes which have three levels of different apertures of 10mum, 2.5mum and less than 0.3mum, so particles in the air are accurately trapped on the nuclear pore filter membranes in a classification way according to the sizes of the particles. The device which realizes the method comprises an air suction device, a flow controller and a nuclear pore membrane filter. The device can accurately trap the particles which have different diameters in the classification way through the nuclear pore filter membranes which have three levels of different absolute apertures, the particles are all trapped on the surfaces of the nuclear pore filter membranes and can be effectively eluted, so the further accurate composition and content analysis is benefited, and the effectiveness of a monitoring result is improved; and the nuclear pore membrane filter is a detachable disposable filter which is low in price, simple to operate and convenient to use.

Description

technical field [0001] The invention relates to an air monitoring hierarchical sampling method and device. Background technique [0002] PM2.5 (particulate matter with an aerodynamic diameter ≤ 2.5 μm) can enter the lungs through the respiratory tract and deposit on the alveoli, and some can directly enter the blood, which is a pollutant that seriously endangers human health. Some countries in the United States and the European Union have already incorporated PM2.5 into national standards and imposed mandatory restrictions, and most countries still monitor PM10 (particulate matter with an aerodynamic diameter ≤ 10 μm). With people's further understanding of the hazards of PM2.5, it has gradually begun to be included in ambient air monitoring standards. Sampling devices commonly used in air monitoring include impact samplers, cyclone samplers, liquid impact samplers, etc. At present, impact samplers are mostly used in air monitoring collection devices in the world, because o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24G01N1/34
Inventor 罗勇吴其玉刘晓玲黄超
Owner WUHAN W E O SCI & TECH DEV
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