Uptake Pathway, Translocation, and Isomerization of Hexabromocyclododecane Diastereoisomers by Wheat in Closed Chambers

Environmental Science & Technology
Hongkai ZhuQixing Zhou

Abstract

To study the uptake pathways of 3 main hexabromocyclododecane diastereoisomers (α-, β-, and γ-HBCDs) in wheat, four closed chambers were designed to expose wheat to HBCDs via air and/or soil for 4 weeks. The results showed that HBCDs could be absorbed by wheat both via root from soil and via leaf from air. The Rt values (ratio of HBCDs from root-to-leaf translocation to the total accumulation in leaves) ranging from 14.4 to 29.8% suggested that acropetal translocation within wheat was limited. A negative linear relationship was found between log Rt and log Kow of the HBCD diastereoisomers (p < 0.05). The bioconcentration factors (BCFs, (μg/g wheat tissues)/(μg/g soil)) were in the order α- > β- > γ-HBCD in wheat roots and stems, being negatively related to their Kow values. No such correlation was found in leaves, where the HBCDs came mainly from air distribution. The results of enantiomeric fractions indicated that the (-)-enantiomer of α- and γ-HBCDs and the (+)-β-enantiomer were selectively accumulated. Furthermore, β- and γ-HBCDs were transformed to α-HBCD in the wheat, with 0.309-4.80% and 0.920-8.40% bioisomerization efficiencies at the end of the experiment, respectively, being the highest in leaves. Additionally, no iso...Continue Reading

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Citations

Sep 10, 2020·Environmental Monitoring and Assessment·Yulian Sun, Hongkai Zhu
May 16, 2020·The Science of the Total Environment·Wenjie RenYing Teng
Mar 3, 2021·Environmental Science and Pollution Research International·Zhuozhen QianShaohong Wei
Mar 24, 2021·Environmental Science & Technology·Weifang ChenGuibin Jiang
Jul 7, 2019·The Science of the Total Environment·Thao Thanh LeYoon-Seok Chang

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