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Standard substance for calibrating PM10 cutter, and preparation and certification method thereof

A standard material, cutter technology, applied in the direction of instruments, scientific instruments, particle and sedimentation analysis, etc., can solve the problem of inability to detect and calibrate the cutting characteristics of PM10 cutters, unable to calibrate and detect the cutting characteristics of PM10 cutters, and no cutting characteristics of PM10 cutters Detection and other problems, to achieve the effect of no change in particle size, accurate and reliable value, and good stability

Inactive Publication Date: 2017-03-08
BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the characteristic values ​​of the above-mentioned 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 the cutting characteristics of the PM10 cutter
[0006] 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 PM10 cutter cutting characteristic detection and calibration, so it is impossible to calibrate and detect the cutting characteristic of PM10 cutter

Method used

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  • Standard substance for calibrating PM10 cutter, and preparation and certification method thereof
  • Standard substance for calibrating PM10 cutter, and preparation and certification method thereof
  • Standard substance for calibrating PM10 cutter, and preparation and certification method thereof

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preparation example Construction

[0042] According to another embodiment of the present invention, the present invention provides a kind of preparation method that is used for calibrating the standard substance of PM10 cutter, comprises the following steps: preparation step: stabilizer and emulsifier are dissolved in deionized water as continuous phase, and Dissolving the initiator and cross-linking agent in styrene as the dispersed phase; reaction step: adding the dispersed phase to the continuous phase, controlling the reaction temperature and reaction time, and stirring evenly to obtain an emulsion sample; and separation step: centrifuging with deionized water The emulsion sample was cleaned, and then sieved by sedimentation to obtain the standard substance for calibrating the PM10 cutter.

[0043] According to another embodiment of the present invention, the above-mentioned preparation method also includes the following steps of determining the value: the first step, using an optical microscope and image an...

Embodiment 1

[0046] Embodiment 1, the preparation of standard substance of the present invention

[0047] The standard substance of the present invention is made up of 7 kinds of spherical particles, and is made through the following steps:

[0048] Preparation steps: Dissolve 4.90 g of polyvinyl alcohol and 2.24 g of sodium dodecylsulfonate in 100 mL of deionized water as the continuous phase, and 0.93 g of benzoyl peroxide and 3.12 g of divinylbenzene in 16.5 mL of styrene as the continuous phase. dispersed phase;

[0049] Reaction steps: adding the dispersed phase into the continuous phase, adjusting the stirring speed to 230r / min, and reacting at 85°C for 10h to obtain an emulsion sample; and

[0050] Separation step: Wash the emulsion sample several times with deionized water to remove unreacted reactants, then place the emulsion sample in deionized water, after settling for 8 hours, the upper layer of the emulsion sample is spherical particles of 5.0 μm, repeat this operation unti...

Embodiment 2

[0051] Embodiment 2, the preparation of standard substance of the present invention

[0052] The standard substance of the present invention is made up of 7 kinds of spherical particles, and is made through the following steps:

[0053] Preparation steps: Dissolve 3.60 g of polyvinyl alcohol and 2.24 g of sodium dodecylsulfonate in 100 mL of deionized water as the continuous phase, and 0.93 g of benzoyl peroxide and 1.44 g of divinylbenzene in 22 mL of styrene as the dispersion Mutually;

[0054] Reaction steps: add the dispersed phase to the continuous phase, adjust the stirring speed to 230r / min, and react at 80°C for 10h to obtain an emulsion sample; and

[0055] Separation step: Wash the emulsion sample several times with deionized water to remove unreacted reactants, then place the emulsion sample in deionized water, after settling for 8 hours, the upper layer of the emulsion sample is spherical particles of 5.0 μm, repeat this operation until The 5.0 μm spherical par...

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Abstract

The invention relates to a standard substance for calibrating a PM10 cutter. The standard substance consists of 7 spherical particles, and the nominal values of the aerodynamic diameters of the seven spherical particles are 5.0 Mum, 7.0 Mum, 9.0 Mum, 10 Mum, 12 Mum, 14 Mum and 18 Mum respectively, and the spherical particles are spherical monodisperse cross-linked polystyrene standard particles. The standard substance is prepared by the following steps: dissolving a stabilizer and an emulsifier in deionized water to be used as a continuous phase, dissolving an initiator and a cross-linking agent in styrene to be used as a dispersed phase; adding the dispersed phase into the continuous phase, controlling the reaction temperature and the reaction time, stirring the mixture to obtain emulsion sample; subjecting the emulsion sample to centrifuging and washing with deionized water, then settling and screening the sample to obtain the standard substance for calibrating the PM10 cutter. The relative standard deviation of the prepared standard particles is less than 2%, the sphericity of the standard particles is greater than 0.95, the standard substance has good sphericity, monodispersity and stability and can be completely applicable to detection and calibration of the PM10 cutter.

Description

technical field [0001] The invention belongs to the technical field of standard substance preparation, and relates to a standard substance for calibrating a PM10 cutter and a method for preparing and determining a value thereof, and to a method for preparing a standard substance for calibrating a PM10 cutter. Background technique [0002] PM10 is suspended particulate matter with an aerodynamic equivalent diameter less than or equal to 10 μm, also known as inhalable particulate matter. The degree of harm of PM10 to the human body depends on the physical and chemical properties of the particulate matter and its source. The composition of particulate matter is the main pathogenic factor, and the concentration and exposure time of particulate matter determine the inhalation amount of particulate matter and the degree of harm to the body. The particle size and state of particulate matter are related to its deposition, retention and elimination in the respiratory tract. Coarse ...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F212/36C08F2/26G01N15/02
CPCC08F212/08G01N15/0227C08F212/36C08F2/26
Inventor 李力张文阁李银慕建洲杜兴科
Owner BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH
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