Tracking SVOCs’ Transfer from Products to Indoor Air and Settled Dust with Deuterium-Labeled Substances

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• 作者：Vilma Sukiene ; Andreas C. Gerecke ; Yu-Mi Park ; Markus Zennegg ; Martine I. Bakker ; Christiaan J. E. Delmaar ; Konrad Hungerbühler ; Natalie von Goetz
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：April 19, 2016
• 年：2016
• 卷：50
• 期：8
• 页码：4296-4303
• 全文大小：388K
• 年卷期：0
• ISSN：1520-5851

文摘

Semivolatile organic compounds (SVOCs) can be released from products and distributed in the indoor environment, including air and dust. However, the mechanisms and the extent of substance transfer into air and dust are not well understood. Therefore, in a small-scale field study the transfer of nine SVOCs was investigated: Four artificial consumer products were doped with eight deuterium-labeled plasticizers (phthalates and adipates) and installed in five homes to investigate the emission processes of evaporation, abrasion, and direct transfer. Intentional release was studied with a commercial spray containing a pyrethroid. During the 12 week study, indoor air and settled dust samples were collected and analyzed. On the basis of our measurement results, we conclude that the octanol-air partitioning coefficient K_oa is a major determinant for the substance transfer into either air or dust: A high K_oa implies that the substance is more likely to be found in dust than in air. The emission process also plays a role: For spraying, we found higher dust and air concentrations than for evaporation. In contrast, apartment parameters like air exchange rate or temperature had just a minor influence. Another important mechanistic finding was that although transfer from product to dust currently is postulated to be mostly mediated by air, direct transport from product to dust on the product surface was also observed.