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本文通过对称重环境、滤纸预处理时间、背景颗粒物质量和空气浮力等因素进行对比试验,分析这些因素的变化对颗粒物质量测量结果的影响。结果表明:相对湿度越靠近45%,颗粒物质量测量的偏差越小,结果越稳定;在6~10小时的预处理时间段对滤纸进行称量,既能节约时间成本,又能保证测量精度;适当增加日常背景颗粒物测量频率,并绘制当日背景颗粒物质量变化图,能及时修正背景颗粒物影响;空气浮力对颗粒物质量的影响主要是由大气压力的波动造成的,应及时对试验前后滤纸质量进行浮力修正。
In this paper, comparative experiments were carried out on weighing environment, filter paper pretreatment time, background particulate matter mass and air buoyancy to analyze the influence of these factors on the measurement results of particulate matter. The results show that the closer the relative humidity is to 45%, the smaller the deviation of the measurement of the particle mass is, the more stable the result is. The filter paper is weighed in the pretreatment time of 6 to 10 hours, which can save the time cost and ensure the measurement accuracy. Appropriate to increase the daily background particle measurement frequency, and draw the day background particle mass change map, timely correction of the impact of background particles; air buoyancy on the impact of particulate matter mass is mainly caused by atmospheric pressure fluctuations, the quality of the filter paper before and after the test should be buoyancy Fixed.