Inhalable particulate matter, usually refers to the particle size of less than 10 microns, also known as PM10.Pm10s last for a long time in the ambient air and have a great impact on human health and atmospheric visibility.When inhaled, pm10 can accumulate in the respiratory system and cause many diseases.Therefore, now many cities will be measured in the environment pm10 particles, the following small editor to introduce you can inhalable pm10 particles determination method.
Sources of PM10 particles
Inhalable particulate matter is one of the most important sources of air pollution, usually from vehicles traveling on unpaved asphalt and cement roads, crushing and grinding of materials, and dust kicked up by the wind.There are two main ways to form pm10s: first, ultrafine pm10s directly emitted by various industrial processes (coal burning, metallurgy, chemical engineering, internal combustion engine, etc.);Second, the secondary formation of ultrafine particles and aerosols in the atmosphere.
Method for the determination of PM10 particulate matter
Scope: the concentration and quality control requirements of PM10 are illustrated by the example of light scattering dust meter for the determination of PM10 in public places.This standard is applicable to the rapid determination of PM10 concentration in the air in public places and other indoor air.
Reference standard: the following standards contain provisions that constitute a standard by reference in this standard, and the edition shown is valid at the time of publication of this standard.All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the following standards.
Hygienic standard for inhalable particulate matter in indoor air
JJG 846-1993 light scattering digital dust tester verification procedures
Determination of dust concentration in the air by light scattering method
Definitions: the following definitions are used in this standard.
1, the particulate matter (PM10) in inhalable particulate matter refers to the quality of the respiratory tract of median diameter of 10 microns particles (D50 = 10 microns)
2. Mass concentration
The amount of PM10 in air per unit volume (mg/m3).
Relative mass concentration
Values measured together with linear correlation to mass concentration (count/min, CPM)
4. Conversion coefficient K for transform relative mass concentration into mass concentration
The ratio of the mass concentration of inhalable particulate matter (PM10) in the air to the relative mass concentration measured by the instrument.
5. Relative overall uncertainty, ROU
The total uncertainty of light scattering method should be less than or equal to 25% compared with filter paper (membrane) sample-weighing method within the concentration range of 0.5~2 times of the hygiene standard.
See formula for the mathematical expression:
ROU=[b +2 MRSD]
Where: b -- the arithmetic mean of the relative difference measured by pairing the two comparison methods;
MRSD - geometric mean of relative standard deviation as determined by light scattering.
When light hits particles suspended in the air, it scatters light.The scattered light intensity of particles is directly proportional to their mass concentration under the condition of a certain property of particles.The particle mass concentration was obtained by measuring the scattered light intensity and the mass concentration conversion coefficient K.Determination of particulate PM10 the GDS06 infrared sensor, HPD05 infrared sensor and laser particulate sensor series provided by lovemay can monitor the particulate matter in the air very well.
Luftmy infrared ㎛ particle sensor
can be measured to 0.3 ~ 10 ㎛ particulate matter, laser particle sensor can detect ㎛ 0.1 ~ 10 ㎛ particulate matter.This allows it to subdivide PM2.5/PM10 more accurately than existing sensors.Compared with traditional sensors, the laser particulate sensor series has higher precision and sensitivity, which can provide reliable information for users, enabling them to control air purifiers, air conditioners and air quality detection equipment more accurately and meticulously.