Algae and mercury (Hg) are ubiquitous in marine environments. In this study, we investigated the effects of a typical marine algae of diatom Skeletonema costatum on Hg methylation by an iron-reducing bacterium of Geobacter sulfurreducens (G. sulfurreducens) PCA. In the absence of Skeletonema costatum, the bacterial MeHg production rate maximized at 104.06 ± 11.7 ng L⁻¹ h⁻¹ with a high Hg level, while the highest methylation efficiency was achieved at a low Hg concentration. The existence of Skeletonema costatum greatly inhibited the capability of G. sulfurreducens PCA to methylate Hg. With the increase in algal biomass, there was a significant mitigation of MeHg formation and Hg⁰ release, leaving a considerable proportion of immobilized Hg²⁺ species (up to 47%) associated with algal cell materials. These results suggest that marine algae are crucial in determining the bioavailability of Hg contaminants and the methylating potential of G. sulfurreducens PCA. Copyright © 2018 Elsevier Ltd. All rights reserved.
CitationDing, L.-Y., He, N.-N., Yang, S., Zhang, L.-J., Liang, P., Wu, S.-C., . . . Tao, H.-C. (2019). Inhibitory effects of Skeletonema costatum on mercury methylation by Geobacter sulfurreducens PCA. Chemosphere, 216, 179-185. doi: 10.1016/j.chemosphere.2018.10.121
- G. sulfurreducens PCA