Ultrasonic essential oil diffusers (EODs) are a popular type of indoor scenting source. We performed a chamber study in which we measured the emissions from EODs used with lemon, lavender, eucalyptus, and grapeseed oils. Over the course of 15 min, the most abundant VOCs released from lemon, lavender, eucalyptus, and grapeseed oils were 2.6 ± 0.7 mg of d-limonene, 3.5 ± 0.4 mg of eucalyptol, 1.0 ± 0.1 mg of linalyl acetate, and 0.2 ± 0.02 mg of linalyl acetate, respectively. Each oil had a unique particulate matter (PM) emission profile in terms of size, number density, and rate. The dominant size ranges of the PM were 10–100 nm for lemon oil, 50–100 nm for lavender oil, 10–50 nm for lemon oil, and above 200 nm for grapeseed oil. PM₁ emission rates of approximately 2 mg/h, 0.1 mg/h, and 3 mg/h, were observed for lemon, lavender/eucalyptus, and grapeseed oils, respectively. A fivefold increase in PM₁ emission was measured when the EOD with eucalyptus oil was filled with tap water as opposed to deionized water. Modeling suggests that reasonable use cases of EODs can contribute substantially to primary and secondary PM in indoor environments, but this potential varies depending on the oil and water types used.

中文翻译：

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超声波精油扩散器的挥发性有机化合物和颗粒物排放

超声波精油扩散器 (EOD) 是一种流行的室内香味源。我们进行了一项室内研究，其中我们测量了与柠檬、薰衣草、桉树和葡萄籽油一起使用的 EOD 的排放量。在 15 分钟的过程中，柠檬、薰衣草、桉树和葡萄籽油释放的最丰富的 VOC 为 2.6 ± 0.7 mg d-柠檬烯、3.5 ± 0.4 mg 桉叶油醇、1.0 ± 0.1 mg 乙酸芳樟酯和 0.2 ±分别为 0.02 毫克乙酸芳樟酯。每种油在大小、数量密度和速率方面都有独特的颗粒物 (PM) 排放特征。PM 的主要尺寸范围是柠檬油 10-100 nm、薰衣草油 50-100 nm、柠檬油 10-50 nm 和葡萄籽油 200 nm 以上。下午_{1 点}分别观察到柠檬、薰衣草/桉树油和葡萄籽油的排放速率约为 2 毫克/小时、0.1 毫克/小时和 3 毫克/小时。与去离子水相比，当含有桉树油的 EOD 充满自来水时，PM ₁排放量增加了五倍。建模表明，EOD 的合理用例可以对室内环境中的一次和二次 PM 产生重大影响，但这种潜力因所使用的油和水类型而异。