Calibration of silicone for passive sampling of semivolatile organic contaminants in indoor air
Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic
Typ dokumentu časopisecké články
PubMed
33873065
DOI
10.1016/j.chemosphere.2021.130536
PII: S0045-6535(21)01007-9
Knihovny.cz E-zdroje
- Klíčová slova
- Inhalation exposure, Model, Persistent organic compounds, Sampler calibration,
- MeSH
- kalibrace MeSH
- látky znečišťující vzduch * analýza MeSH
- lidé MeSH
- monitorování životního prostředí MeSH
- polychlorované bifenyly * analýza MeSH
- polycyklické aromatické uhlovodíky * analýza MeSH
- silikony MeSH
- znečištění vzduchu ve vnitřním prostředí * analýza MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- látky znečišťující vzduch * MeSH
- polychlorované bifenyly * MeSH
- polycyklické aromatické uhlovodíky * MeSH
- silikony MeSH
Semivolatile organic compounds (SVOCs) are mostly man-made chemicals that distribute between the gas and solid phase in the environment. Many of them could pose harm to people and therefore it is important to know their concentrations in the indoor environment to evaluate the related risks. Inhalation exposure can be assessed using passive sampling. In this study, we employed silicone elastomer as a passive sampler for monitoring gaseous polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs) and polybrominated diphenyl ethers (PBDEs) in indoor air. We performed a sampler calibration study in which samplers consisting of 0.5 mm thick silicone sheets with a total surface area of 300 cm2 were exposed to indoor air in a university lecture theatre for up to 56 days. Uptake kinetics of SVOCs was studied by collecting 2 samplers every week. The results were used to develop a model based on mass transfer theory that can be used to estimate the air sampling rate RS as a function of compound's molecular volume. We examined release kinetics of performance reference compounds that covered a broad range of silicone-air partition coefficient (log KSA 5.95-9.49) and investigated a hypothesis of isotropic exchange kinetics, i.e. equality of rate constants for uptake and release, of SVOCs. PCBs and OCPs concentration in air calculated from contaminant amounts accumulated in passive samplers were in good agreement with those determined by active sampling running simultaneously during the entire study. The use of performance reference compounds is suitable for in situ passive sampler calibration.
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