TY - JOUR
T1 - Uptake and transport mechanisms of decabromodiphenyl ether (BDE-209) by rice (Oryza sativa)
AU - Chow, Ka Lai
AU - Man, Yu Bon
AU - Tam, Nora Fung Yee
AU - Liang, Yan
AU - Wong, Ming Hung
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - The extensive industrial use of brominated flame retardants has aroused rapidly growing public concerns about their ubiquity in the environment. The feasibility of uptake and translocation of decabromodiphenyl ether (BDE-209) by three rice cultivars, namely Fengmeizhan, Hefengzhan and Guangyinzhan, and the uptake mechanisms of BDE-209 into rice roots, were investigated by employing a partition-limited model. Uptake of BDE-209 by the rice cultivars (Fengmeizhan, Hefengzhan and Guangyinzhan) was examined by a 60-day cultivation in sterilized BDE-209 spiked sand, followed by Soxhlet extraction and gas chromatography-mass spectrometry (GC-MS) analysis. A partition-limited model was applied for estimating and describing the approach of the uptake of BDE-209 by rice in sand. The average quasi-equilibrium factor (αpt) of BDE-209 in root uptake in sand was 0.112×10-3 for three rice cultivars in the present study (<1), implying a non-equilibrium movement of molecules and a dominated passive transport uptake. According to the results of sorption analysis of dead and fresh roots, apoplastic pathway likely dominated the transport of BDE-209 into roots cells.
AB - The extensive industrial use of brominated flame retardants has aroused rapidly growing public concerns about their ubiquity in the environment. The feasibility of uptake and translocation of decabromodiphenyl ether (BDE-209) by three rice cultivars, namely Fengmeizhan, Hefengzhan and Guangyinzhan, and the uptake mechanisms of BDE-209 into rice roots, were investigated by employing a partition-limited model. Uptake of BDE-209 by the rice cultivars (Fengmeizhan, Hefengzhan and Guangyinzhan) was examined by a 60-day cultivation in sterilized BDE-209 spiked sand, followed by Soxhlet extraction and gas chromatography-mass spectrometry (GC-MS) analysis. A partition-limited model was applied for estimating and describing the approach of the uptake of BDE-209 by rice in sand. The average quasi-equilibrium factor (αpt) of BDE-209 in root uptake in sand was 0.112×10-3 for three rice cultivars in the present study (<1), implying a non-equilibrium movement of molecules and a dominated passive transport uptake. According to the results of sorption analysis of dead and fresh roots, apoplastic pathway likely dominated the transport of BDE-209 into roots cells.
KW - Apoplastic path
KW - Brominated flame retardants
KW - Partition-limited model
KW - Quasi-equilibrium factor
UR - http://www.scopus.com/inward/record.url?scp=84919724993&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2014.10.016
DO - 10.1016/j.chemosphere.2014.10.016
M3 - Article
C2 - 25460770
AN - SCOPUS:84919724993
SN - 0045-6535
VL - 119
SP - 1262
EP - 1267
JO - Chemosphere
JF - Chemosphere
ER -