Effects of low molecular-weight organic acids and dehydrogenase activity in rhizosphere sediments of mangrove plants on phytoremediation of polycyclic aromatic hydrocarbons

Yuanyuan Wang, Ling Fang, Li Lin, Tiangang Luan, Nora F.Y. Tam

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)

Abstract

This work evaluated the roles of the low-molecular-weight organic acids (LMWOAs) from root exudates and the dehydrogenase activity in the rhizosphere sediments of three mangrove plant species on the removal of mixed PAHs. The results showed that the concentrations of LMWOAs and dehydrogenase activity changed species-specifically with the levels of PAH contamination. In all plant species, the concentration of citric acid was the highest, followed by succinic acid. For these acids, succinic acid was positively related to the removal of all the PAHs except Chr. Positive correlations were also found between the removal percentages of 4-and 5-ring PAHs and all LMWOAs, except citric acid. LMWOAs enhanced dehydrogenase activity, which positively related to PAH removal percentages. These findings suggested that LMWOAs and dehydrogenase activity promoted the removal of PAHs. Among three mangrove plants, Bruguiera gymnorrhiza, the plant with the highest root biomass, dehydrogenase activity and concentrations of LMWOAs, was most efficient in removing PAHs.

Original languageEnglish
Pages (from-to)152-159
Number of pages8
JournalChemosphere
Volume99
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Keywords

  • Mangrove
  • Organic acids
  • PAHs
  • Remediation
  • Root exudate

Fingerprint

Dive into the research topics of 'Effects of low molecular-weight organic acids and dehydrogenase activity in rhizosphere sediments of mangrove plants on phytoremediation of polycyclic aromatic hydrocarbons'. Together they form a unique fingerprint.

Cite this