Formation and distribution of methylmercury in sediments at a mariculture site: A mesocosm study

Peng LIANG, Cheung-Lung LAM, Zhang CHEN, Hong-Sheng WANG, Jian-Bo SHI, Sheng-Chun WU, Wen-Xiong WANG, Jin ZHANG, Hailong WANG, Ming Hung WONG

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Abstract

Purpose: The aim of the present study was to investigate the differences of methylmercury (MeHg) formation and distribution between mariculture (aquaculture) sediments (MS) and reference sediments (RS) collected from a site in Hong Kong.
Materials and methods: The MS and RS samples were split into four batches, three of which were spiked with HgCl2 aqueous solution to a concentration of 0.8, ,2 and 8 mg k g−1 in sediment samples SP1, SP2, and SP3, respectively, while the rest served as a control batch (referred to as C).
Results and discussion: The results showed that the highly Hg-polluted sediment produced greater amounts of MeHg. During the culture period, MeHg concentrations in sediments decreased over time. The decreasing percentage increased in the order of SP3 < SP2 < SP1, which might be due to the inhibition of MeHg degradation by high Hg concentrations. The mean value of MeHg concentrations and %MeHg of the total Hg (THg) in MS was significantly lower than those in RS, possibly due to the complexation of Hg with organic ligands, leading to lower Hg bioavailability for methylation bacteria. The distribution coefficient of THg (KdT) was relatively high in MS compared to RS, indicating that the former had a greater number of binding sites for Hg adsorption.
Conclusions: Methylmercury formation was inhibited in MS, probably due to increased complexation of Hg2+ with organic matter and adsorption of Hg to MS. Furthermore, the mean value of KdT in MS was relatively high when compared to RS, which illustrates that MS sediments have more binding sites than RS for adsorption of Hg. Copyright © 2013 Springer-Verlag Berlin Heidelberg.
Original languageEnglish
Pages (from-to)1301-1308
JournalJournal of Soils and Sediments
Volume13
Issue number7
Early online dateJun 2013
DOIs
Publication statusPublished - Aug 2013

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mariculture
mesocosm
methylmercury
sediment
adsorption
complexation
distribution
methylation
bioavailability
ligand
aquaculture
aqueous solution

Citation

Liang, P., Lam, C.-L., Chen, Z., Wang, H.-S., Shi, J.-B., Wu, S.-C., . . . Wong, M.-H. (2013). Formation and distribution of methylmercury in sediments at a mariculture site: A mesocosm study. Journal of Soils and Sediments, 13(7), 1301-1308. doi: 10.1007/s11368-013-0719-x

Keywords

  • Aquaculture
  • Marine sediment
  • Mercury
  • Methylation rate