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Diameter determining method for calibrating standard substance of PM2.5 and PM10 cutter

A standard material, PM2.5 technology, applied in the field of standard materials, can solve the problem that aerodynamic standard particles cannot be traced, there is no PM2.5 and PM10 cutter cutting characteristics to detect aerodynamic standard particles, and PM2.5 and PM10 cannot be detected Cutter cutting characteristics detection calibration and other issues

Inactive Publication Date: 2017-02-22
BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the characteristic values ​​of domestic and foreign standard materials are all physical diameters, and the aerodynamic diameter of the standard materials is not given exactly, so they cannot be directly used for the detection and calibration of cutting characteristics of PM2.5 and PM10 cutters
[0005] To sum up, at present, the standard particle characteristic value at home and abroad is only the physical diameter, and there is no aerodynamic standard particle for the detection and calibration of the cutting characteristics of PM2.5 and PM10 cutters. This is mainly because the source of the aerodynamic standard particle cannot be traced. The problem

Method used

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  • Diameter determining method for calibrating standard substance of PM2.5 and PM10 cutter
  • Diameter determining method for calibrating standard substance of PM2.5 and PM10 cutter
  • Diameter determining method for calibrating standard substance of PM2.5 and PM10 cutter

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1, the fixed value that is used for calibrating the standard substance of PM2.5 cutter

[0047] The first step is to prepare standard materials for calibrating the PM2.5 cutter (8 kinds of aerodynamic nominal diameters are 1.5 μm, 2.0 μm, 2.2 μm, 2.5 μm, 2.8 μm, 3.0 μm, 3.5 μm and 4.0 μm respectively. μm spherical monodisperse cross-linked polystyrene particles): Preparation steps: Dissolve 2.2g of polyvinylpyrrolidone in a mixed solution of 190mL of ethanol and 16mL of deionized water as the water phase, 0.5437g of azobisisobutyronitrile and 0.0622 g of divinylbenzene was dissolved in 45mL of styrene as the organic phase; reaction steps: adding the organic phase to the water phase, adjusting the stirring speed to 300r / min, and reacting at 69°C for 20h to obtain an emulsion sample; and separation steps: Emulsion samples were washed by centrifugation with ethanol and deionized water for 3 times to remove unreacted dispersants, initiators and styrene; then th...

Embodiment 2

[0057] Embodiment 2, the fixed value that is used for calibrating the standard substance of PM2.5 cutter

[0058]The first step is to prepare the standard substance used to calibrate the PM10 cutter (composed of 7 aerodynamic nominal diameters D ae Spherical monodisperse cross-linked polystyrene standard particles of 5.0 μm, 7.0 μm, 9.0 μm, 10 μm, 12 μm, 14 μm and 18 μm respectively): preparation steps: mix 4.90 g of polyvinyl alcohol and 2.24 g of sodium dodecylsulfonate (SDS) was dissolved in 100mL deionized water as the continuous phase, 0.93g benzoyl peroxide and 3.12g divinylbenzene were dissolved in 16.5mL styrene as the dispersed phase; reaction steps: the dispersed phase was added to the continuous phase, adjusted The stirring speed is 230r / min, react at 85°C for 10h, and obtain the emulsion sample; and separation step: wash the emulsion sample with deionized water several times to remove unreacted reactants, and then place the emulsion sample in deionized water Aft...

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Abstract

The invention relates to a diameter determining method for calibrating a standard substance of a PM2.5 and PM10 cutter. The method comprises steps as follows: step one, the standard substance is prepared; step two, the physical diameter of the standard substance is determined with a microscope method; step three, the true density of the standard substance is measured; step four, the aerodynamic diameter of the standard substance is calculated through formula (1). The diameter determining method for calibrating the standard substance of the PM2.5 and PM10 cutter has good accuracy, reliability and value traceability.

Description

technical field [0001] The invention belongs to the technical field of standard substances, and relates to a method for determining the value of standard substances used for calibrating PM2.5 and PM10 cutters. Background technique [0002] PM2.5 and PM10 monitoring are techniques for measuring the state of atmospheric particulate matter. Therefore, the particle sizes involved in their research are based on the aerodynamic diameter D ae express. The aerodynamic diameter is determined based on the inertia of the particle in the air and its motion under the influence of the earth's gravity. Specifically expressed as: a certain particle a, regardless of its geometric shape, size and density, if its sedimentation velocity in the air is the same as that of a spherical particle b with a density of 1, then the diameter of particle b can be used as the diameter of a Aerodynamic diameter D ae . [0003] In 2011, the Ministry of Environmental Protection promulgated the "HJ618-2011 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N15/02
CPCG01N1/28G01N15/0227G01N2001/2893
Inventor 李力张文阁李蕴翔李银窦晓亮
Owner BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH
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