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Émissions intérieures de nanoparticules et expositions lors d’activités de coiffure utilisant la chaleur.

Indoor nanoparticle emissions and exposures during heat-based hair styling activities.

Numéro : 3226

Auteurs : LIU J., JIANG J., PATRA S. S., DING X., HUANG C., CROSS J. N., BOOR B. E., JUNG N.

Résumé

Exposure to indoor gas- and particle-phase emissions were demonstrated to have adverse impact to both human health and indoor environment. Our recent study has revealed that indoor hair styling activities using hair care products (HCPs) can release large quantity of volatile organic compounds (VOCs) that can be inhaled by occupant with high mass intake. Besides VOCs, HCPs may also emit organic compounds with different degree of volatility, such as semi-, intermediate-, and low-volatility compounds (SVOCs, IVOCs, and LVOCs). These compounds have the potential to nucleate and condense to primary nanoparticles. During hair styling, HCPs are often used in combination with heat-based appliances, such as hair straighteners, hair curlers, hair wavers, and blow dryers. The combination of chemically complex HCPs and heat may generate particle-phase contaminants that can be subsequently inhaled into the respiratory system. To evaluate indoor nanoparticle emissions and exposures during heat-based hair styling activities in residential buildings, realistic hair care routines were simulated in a mechanically ventilated residential building – the Purdue zero Energy Design Guidance for Engineers (zEDGE) Test House. Particle concentrations and size distributions from 6 to 10000 nm were measured in real-time (1 Hz) with a high-resolution electrical low-pressure impactor (HR-ELPI+) and nanoparticles (6 – 500 nm) were evaluated in this study. During the measurement campaign, siloxane-based HCPs were used in tandem with different heat appliances. Occupant exposures were evaluated through size-resolved respiratory tract deposited doses and dose rates (RTDDN and RTDDRN).
Our results revealed that heat-based hair styling activities can produce significant amounts of airborne nanoparticles, with number concentrations often in the range of 104 to 105 particles cm-3. Indoor nanoparticle number size distributions were generally bi-modal with peak diameter between 10 to 100 nm for styling activities using hair straighteners. The emitted nanoparticles are likely formed during heat-based processes involving the vaporization and thermal decomposition of chemical constituents in the HCPs. For human exposure analysis, sub-100 nm nanoparticles exhibited higher size-resolved RTDDRN and the total RTDDN during hair care routines can reach 1010 particles cm-3 across the head airways, tracheobronchial region, and pulmonary region per occupant. Our results demonstrate that heat-based hair styling activities represent a major yet unknown source of airborne nanoparticles in bathrooms and bedrooms of residential buildings.

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Pages : 9 p.

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Détails

  • Titre original : Indoor nanoparticle emissions and exposures during heat-based hair styling activities.
  • Identifiant de la fiche : 30032951
  • Langues : Anglais
  • Source : 2024 Purdue Conferences. 8th International High Performance Buildings Conference at Purdue.
  • Date d'édition : 15/07/2024

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