Distribution and speciation of mercury affected by humic acid in mariculture sites at the Pearl River estuary

Lingyun DING, Kaiyun ZHAO, Lijuan ZHANG, Peng LIANG, Shengchun WU, Ming Hung WONG, Huchun TAO

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

At the Pearl River Estuary of southern China, mercury and its environmental problems have long been a great concern. This study investigated the distribution and speciation of mercury compounds that are significantly influenced by the increasing content of humic acid (HA, a model natural organic matter) in this region. The inorganic mercury and methyl mercury, being adsorbed and converted at different HA levels, were studied in sediments and surface water at both mariculture and their reference sites. In mariculture sediments with higher HA content (up to 4.5%), more mercury were adsorbed at different compound levels, promoting the methylation and accumulation of mercury (P < 0.05) at the sediment-water interface. Seasonal shift in environmental temperature might control the HA content, subsequently favouring mercury methylation (maximum 1.75 ± 0.08 mg L⁻¹ d⁻¹) under warm weather conditions. In reference sites received less HA wastes, lower adsorption capacity and methylation rate were observed for mercury in sediments and surface water. Our work points to the significant roles of HA on mercury distribution and speciation both spatially and seasonally, thus addressing the impacts of mariculture activities on estuary eco-system. Copyright © 2018 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)623-629
JournalEnvironmental Pollution
Volume240
Early online date15 May 2018
DOIs
Publication statusPublished - Sep 2018

Citation

Ding, L., Zhao, K., Zhang, L., Liang, P., Wu, S., Wong, M. H., & Tao, H. (2018). Distribution and speciation of mercury affected by humic acid in mariculture sites at the Pearl River estuary. Environmental Pollution, 240, 623-629. doi: 10.1016/j.envpol.2018.04.142

Keywords

  • Humic acid
  • Mercury
  • Methylation
  • Adsorption
  • Mariculture

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