TY - JOUR
T1 - Exposure assessment and distribution of polychlorinated biphenyls (PCBs) contained in indoor and outdoor dusts and the impacts of particle size and bioaccessibility
AU - Wang, Wei
AU - Huang, Min Juan
AU - Zheng, Jin Shu
AU - Cheung, Kwai Chung
AU - Wong, Ming Hung
N1 - Funding Information:
Financial support from the Research Grants Council of the University Grants Committee of Hong Kong : GRF ( HKBU 260209 ) and N_HKBU210/11 is gratefully acknowledged.
PY - 2013/10/1
Y1 - 2013/10/1
N2 - The size fraction, bioaccessibility and associated human daily intake of PCBs via indoor and outdoor dust collected from two most populated urban centers of Pearl River Delta (PRD), China, were studied. The σPCBs levels (ngg-1) in indoor (51.9-264) and outdoor (4.02-228) dust in Guangzhou (GZ) were found higher than those in indoor (17.4-137) and outdoor (7.75-114) dust of Hong Kong (HK). Hexa-PCB was the largest contributor in dust samples (29-64%), followed by tri-PCB. The size fraction of PCBs indicated a high accumulation effect of particles less than 63μm, while the lowest was found in 280-2000μm. Toxic equivalency (TEQ) of dioxin-like PCBs in indoor dust of GZ and HK was 2 to 13 times higher than that in outdoor dust. The bioaccessibility of PCBs was determined as 5-61% depending on individual PCB congeners under study and bioaccessible PCB exposure was significantly lower than the estimate for total PCB. The daily intake of bioaccessible PCBs via dust ranged in 0.02-8.95 and 0.37-17.8ngday-1 in GZ while 0.01-4.95 and 0.16-9.83ngday-1 in HK for adults and children, respectively. Dust ingestion contributed to 0.49-10.6% of overall non-dietary PCB exposure (dust ingestion and inhalation) for adults while 12.9-35% for children, indicating the dominant contribution from inhalation.
AB - The size fraction, bioaccessibility and associated human daily intake of PCBs via indoor and outdoor dust collected from two most populated urban centers of Pearl River Delta (PRD), China, were studied. The σPCBs levels (ngg-1) in indoor (51.9-264) and outdoor (4.02-228) dust in Guangzhou (GZ) were found higher than those in indoor (17.4-137) and outdoor (7.75-114) dust of Hong Kong (HK). Hexa-PCB was the largest contributor in dust samples (29-64%), followed by tri-PCB. The size fraction of PCBs indicated a high accumulation effect of particles less than 63μm, while the lowest was found in 280-2000μm. Toxic equivalency (TEQ) of dioxin-like PCBs in indoor dust of GZ and HK was 2 to 13 times higher than that in outdoor dust. The bioaccessibility of PCBs was determined as 5-61% depending on individual PCB congeners under study and bioaccessible PCB exposure was significantly lower than the estimate for total PCB. The daily intake of bioaccessible PCBs via dust ranged in 0.02-8.95 and 0.37-17.8ngday-1 in GZ while 0.01-4.95 and 0.16-9.83ngday-1 in HK for adults and children, respectively. Dust ingestion contributed to 0.49-10.6% of overall non-dietary PCB exposure (dust ingestion and inhalation) for adults while 12.9-35% for children, indicating the dominant contribution from inhalation.
KW - Bioaccessibility
KW - Carcinogenic hazard (TEQ)
KW - Health risk assessment
KW - Indoor and outdoor dust
KW - Particle size fraction
KW - Polychlorinated biphenyl
UR - http://www.scopus.com/inward/record.url?scp=84883459892&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2013.04.059
DO - 10.1016/j.scitotenv.2013.04.059
M3 - Journal article
C2 - 23706479
AN - SCOPUS:84883459892
SN - 0048-9697
VL - 463-464
SP - 1201
EP - 1209
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -
