【摘要】 为优化激光粒度仪湿法测试城市不同类型扬尘的最佳参数范围，以四种城市典型开放源颗粒物为实验样品，采用bettersize2600激光粒度仪进行湿法实验，通过设定不同进样量、对比粗颗粒筛除前后的重复性等条件，确定和优化关键参数，结果表明遮光率与样品粒径大小和均匀性关系密切，对于以细颗粒物为主的开放源粉尘，测量时遮光率控制在20%～30%，进样量可控制在0.2～0.3 g；对于开放源粉尘粗颗粒占比较大且不均匀的情况，遮光率范围应收缩，合适范围在10%～20%，进样量可控制在0.3～0.6 g。如果颗粒物极不均匀，且粒径范围较大、存在粒径超过1 000μm的粗颗粒物时，应预先过一定目数的标准筛，以筛下颗粒物进行测定。更多还原

【Abstract】 In order to optimize the best parameter range of the laser particle size analyzer for wet testing of different types of dust in cities, four typical open source particulate matter in cities were used as experimental samples, and the bettersize 2600 laser particle size analyzer was used for wet experiments. Conditions such as repeatability before and after particle screening were determined and optimized. The results showed that the shading rate was closely related to the particle size and uniformity of the sample. For open source dust mainly fine particles, the shading rate was controlled at 20%-30% during measurement, the injection volume was controlled within 0.2-0.3 g; for the large and uneven open source dust particles, the shading rate range should be reduced, and the appropriate range was 10%-20%, and the injection volume was controlled in 0.3-0.6 g. If the particles were extremely non-uniform, and the particle size range was large, and there were coarse particles with a particle size of more than 1 000 μm, they should be passed through a standard sieve of a certain mesh in advance to determine the particles under the sieve.更多还原