Difference:
1, with different properties: fine particles are particles with aerodynamic equivalent diameter less than or equal to 2.5 microns in ambient air. Ultrafine particles refer to particles with equivalent particle size less than 0. 1 μ m, and inhalable particles refer to particles with particle size less than10μ m. Suspended particles refer to solid and liquid particles (or aerosols) suspended in the atmosphere.
2. Different sources: suspended particles contain smoke and dust produced by burning fossil fuels; Industrial dust, metal dust and cement dust produced by industrial production and construction; Automobile, airplane exhaust, etc. Inhalable particles usually come from motor vehicles running on unpaved asphalt and cement roads, the crushing and grinding process of materials and the dust raised by the wind.
3. Different components: The chemical components of fine particles mainly include organic carbon (OC), elemental carbon (EC), nitrate, sulfate, ammonium salt and sodium salt (Na? ) and so on. Ultrafine particles are not.
Extended data:
Matters needing attention in the determination of suspended solids:
1, solid substances that float or sink unevenly are not suspended substances and should be removed from the collected water samples.
2. When storing water samples, no protective agent can be added to prevent the distribution balance of substances in solid and liquid phases from being destroyed.
3. Preparation of filter membrane: Take the filter membrane with flat-headed toothless tweezers, put it into a constant-weight weighing bottle in advance, move it into an oven, dry it at 103- 105℃ for 0.5h, then take it out and put it into a dryer to cool it to room temperature, weigh it, repeatedly dry it, and weigh it after cooling until the weight difference between the two weighing is less than or equal to ≤0.2mg.
Too much suspended matter trapped on the filter membrane may entrain too much water, which will not only prolong the drying time, but also make filtration difficult. In this case, take less samples.
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