Zhang Q, Avalos J, Zhu Y
Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, CA, USA.
Indoor Air. 2014 Apr;24(2):190-8. doi: 10.1111/ina.12069. Epub 2013 Oct 19.
This study characterized fine (PM2.5 ) and ultrafine particle (UFP, diameter < 100 nm) emissions from microwave popcorn and analyzed influential factors. Each pre-packed popcorn bag was cooked in a microwave oven enclosed in a stainless steel chamber for 3 min. The number concentration and size distribution of UFPs and PM2.5 mass concentration were measured inside the chamber repeatedly for five different flavors under four increasing power settings using either the foil-lined original package or a brown paper bag. UFPs and PM2.5 generated by microwaving popcorn were 150-560 and 350-800 times higher than the emissions from microwaving water, respectively. About 90% of the total particles emitted were in the ultrafine size range. The emitted PM concentrations varied significantly with flavor. Replacing the foil-lined original package with a brown paper bag significantly reduced the peak concentration by 24-87% for total particle number and 36-70% for PM2.5 . A positive relationship was observed between both UFP number and PM2.5 mass and power setting. The emission rates of microwave popcorn ranged from 1.9 × 10(10) to 8.0 × 10(10) No./min for total particle number and from 134 to 249 μg/min for PM2.5 .
本研究对微波爆米花产生的细颗粒物（PM2.5）和超细颗粒物（UFP，直径<100纳米）排放特征进行了表征，并分析了影响因素。每个预包装爆米花袋在置于不锈钢箱内的微波炉中烹饪3分钟。使用带铝箔内衬的原装包装或棕色纸袋，在四种逐渐增加的功率设置下，对五种不同口味爆米花在箱内重复测量UFP的数量浓度和粒径分布以及PM2.5质量浓度。微波爆米花产生的UFP和PM2.5分别比微波水产生的排放物高150 - 560倍和350 - 800倍。排放的总颗粒中约90%处于超细粒径范围。排放的PM浓度因口味不同而有显著差异。用棕色纸袋取代带铝箔内衬的原装包装可使总颗粒数的峰值浓度显著降低24% - 87%，使PM2.5的峰值浓度显著降低36% - 70%。观察到UFP数量和PM2.5质量与功率设置之间呈正相关。微波爆米花的排放速率总颗粒数为1.9×10(10)至8.0×10(10)个/分钟，PM2.5为134至249微克/分钟。
