Distribution, diastereomer-specific accumulation and associated health risks of hexabromocyclododecanes (HBCDs) in soil-vegetable system of the Pearl River Delta region, South China

Huixiong LÜ, Xiao-Jing MA, Xue-Jing HUANG, Shaoyou LU, Yu-Hong HUANG, Ce-Hui MO, Quan-Ying CAI, Ming Hung WONG

Research output: Contribution to journalArticle

Abstract

The distribution and diastereomeric profiles of hexabromocyclododecanes (HBCDs, identified as persistent organic pollutants) in soil-vegetable system of open fields remain unknown. In this study, three main HBCD diastereoisomers (α-, β-, and γ-HBCDs) were analyzed in paired soil and vegetable samples from vegetable farms in four cities (Guangzhou, Jiangmen, Huizhou, Foshan) of the Pearl River Delta region, Southern China. The sum concentrations of the three diastereoisomers (∑HBCDs) in soils varied from 0.99 to 18.4 ng/g (dry weight) with a mean of 5.77 ng/g, decreasing in the order of Jiangmen > Guangzhou > Huizhou > Foshan. The distributions of HBCDs in both soil and vegetable were diastereomer-specific, with γ-HBCD being predominant. The ∑HBCDs in vegetables ranged from 0.87 to 32.7 ng/g (dry weight) with a mean of 16.6 ng/g, generally higher than those of the corresponding soils. Thus bioconcentration factors (BCFs, the ratio of contaminant concentration in vegetable to that in soil) of HBCDs were generally greater than 1.0, implying higher accumulation in vegetable. The estimated daily intake (EDI) of ΣHBCDs via consumption of vegetables varied from 0.26 to 9.35 ng/kg bw/day with a mean of 3.60 ng/kg bw/day for adults and from 0.32 to 11.5 ng/kg bw/day with a mean of 4.41 ng/kg bw/day for Children, far lower than the oral reference dose (RfD, 2 × 10⁵ ng/kg bw/day) proposed by US National Research Council. These results suggest that HBCD in the vegetables posed low health risk for the local population. These data are the first report on HBCD occurrence and health risk in soil-vegetable system of open fields. Copyright © 2019 Elsevier Ltd. All rights reserved.
Original languageEnglish
Article number109321
JournalJournal of Environmental Management
Volume248
Early online dateAug 2019
DOIs
Publication statusPublished - Oct 2019

Citation

Lü, H., Ma, X.-J., Huang, X.-J., Lu, S., Huang, Y.-H., Mo, C.-H., . . . Wong, M.-H. (2019). Distribution, diastereomer-specific accumulation and associated health risks of hexabromocyclododecanes (HBCDs) in soil-vegetable system of the Pearl River Delta region, South China. Journal of Environmental Management, 248. Retrieved from https://doi.org/10.1016/j.jenvman.2019.109321

Keywords

  • Brominated flame retardants
  • Vegetable
  • Diastereomers
  • Accumulation
  • Estimated daily intake

Fingerprint Dive into the research topics of 'Distribution, diastereomer-specific accumulation and associated health risks of hexabromocyclododecanes (HBCDs) in soil-vegetable system of the Pearl River Delta region, South China'. Together they form a unique fingerprint.