New equation to predict size-resolved gas-particle partitioning quotients for polybrominated diphenyl ethers

Approach to Predicting the Size-Dependent Inhalation Intake of Particulate Novel Brominated Flame Retardants

“…Samples of bulk particulates, size-segregated particles, and gaseous samples were collected simultaneously at the campus of Harbin Institute of Technology (HIT), Harbin, China, between July 2017 and March 2018 with temperatures ranging from −28.3 to 32.0 °C. Information about the sampling activity and the samples has been described in detail elsewhere . Briefly, 363 size-segregated particle samples were collected using a Micro-Orifice Uniform Deposit Impactor (MOUDI, Model 110, MSP Corporation, U.S.A.) loaded with quartz fiber filters (11 per batch with 11 size-ranges: >18, 10–18, 5.6–10, 3.2–5.6, 1.8–3.2, 1–1.8, 0.56–1, 0.32–0.56, 0.18–0.32, 0.1–0.18, and 0.056–0.1 μm).…”

“…Descriptions for quality assurance and quality control (QA/QC), including the field blank, spike recoveries, detection ratios, and instrument detection limit, are provided in Section S2 and Table S1. All samples were preprepared, extracted, purified, and analyzed at the Laboratory of the International Joint Research Center for Persistent Toxic Substances ( IJRC-PTS ), HIT, using processes described previously. , Eight NBFR compounds, pentabromotoluene (PBT), pentabromoethylbenzene (PBEB), hexabromobenzene (HBBz), 2,3-dibromopropyl 2,4,6-tribromophenyl ether (DPTE), 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EHTBB), bis­(2-ethylhexyl) tetrabromophthalate (BEHTBP), 1,2-bis­(2,4,6-tribromophenoxy) ethane (BTBPE), and decabromodiphenylethane (DBDPE), were quantified using an Agilent 7890B gas chromatograph (column: DB-5MS, 15 m × 0.25 mm × 0.1 mm, J&W Scientific) coupled with a 5977A mass spectrometer in the negative chemical ionization mode.…”

“…This is the curial reason that the current G/P partitioning models, including the Junge–Pankow (J-P) model, the Harner–Bidleman (H–B) model, the poly parameter linear free energy relationship model, the Li–Jia (L-J) empirical model, and the Li–Ma–Yang (L-M-Y) steady state model, treat the particulate phase as “bulk”. There are some limited studies on size-resolved G/P partition models, and most of them overestimated the particulate portion of the chemicals with a high octanol–air partitioning coefficient ( K OA ). , With the L-M-Y steady state model, Hu and co-workers developed a size-resolved G/P partition model that successfully predicted the size-dependent inhalation intake of polybrominated diphenyl ethers (PBDEs) …”

Approach to Predicting the Size-Dependent Inhalation Intake of Particulate Novel Brominated Flame Retardants

“…( 12) (log KPS-di, red solid line) against the monitoring data in Harbin, China. 1 The blue and red dot lines are the ADRs of log KPEi and log KPS-di, respectively; red numbers are the maximum value for log KPS-di, respectively.SError! Bookmark not defined.…”

“…( 12) (log KPS-di, red solid line) against the monitoring data in Guangzhou, China 32 . The blue and red dot lines are the ADRs of log KPEi and log KPS-di, Samples were treated as our previous study 1 . Briefly, the glass fiber filters and quartz fiber filters were dried and weighed first.…”