Search

Your search keyword '"Fengjie, Liu"' showing total 2 results
Start Over Author "Fengjie, Liu" Publisher american chemical society
2 results on '"Fengjie, Liu"'

1. Unravelling Metal Speciation in the Microenvironment Surrounding Phytoplankton Cells to Improve Predictions of Metal Bioavailability

Author

Dominik J. Weiss, Anne Crémazy, Fengjie Liu, Peter G. C. Campbell, Claude Fortin, Qiao-Guo Tan, and The Royal Society

Subjects
Biological Availability, 010501 environmental sciences, 01 natural sciences, Marine species, Article, Metals, Heavy, Phytoplankton, Environmental Chemistry, Lack of knowledge, Seawater, 14. Life underwater, 0105 earth and related environmental sciences, Chemistry, fungi, Equilibrium modeling, General Chemistry, Mercury, 6. Clean water, Divalent metal, Metal bioavailability, 13. Climate action, Metals, Environmental chemistry, Environmental Sciences, Water Pollutants, Chemical, Metal speciation
Abstract

A lack of knowledge on metal speciation in the microenvironment surrounding phytoplankton cells (i.e., the phycosphere) represents an impediment to accurately predicting metal bioavailability. Phycosphere pH and O2 concentrations from a diversity of algae species were compiled. For marine algae in the light, the average increases were 0.32 pH units and 0.17 mM O2 in the phycosphere, whereas in the dark the average decreases were 0.10 pH units and 0.03 mM O2, in comparison to bulk seawater. In freshwater algae, the phycosphere pH increased by 1.28 units, whereas O2 increased by 0.38 mM in the light. Equilibrium modeling showed that the pH alteration influenced the chemical species distribution (i.e., free ion, inorganic complexes, and organic complexes) of Al, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb, Sc, Sm, and Zn in the phycosphere, and the O2 fluctuation increased oxidation rates of Cu(I), Fe(II) and Mn(II) from 2 to 938-fold. The pH/O2-induced changes in phycosphere metal chemistry were larger for freshwater algae than for marine species. Reanalyses of algal metal uptake data in the literature showed that uptake of the trivalent metals (Sc, Sm and Fe), in addition to divalent metals, can be better predicted after considering the phycosphere chemistry.

Published
2020

2. Facilitated Bioaccumulation of Cadmium and Copper in the Oyster Crassostrea hongkongensis Solely Exposed to Zinc.

Author

Fengjie Liu and Wen-Xiong Wang

Subjects
*BIOACCUMULATION, *CRASSOSTREA, *PHYSIOLOGICAL effects of zinc, *CADMIUM in the body, *COPPER in the body, *OYSTER contamination, *HEAVY metal marine pollution, *METALLOTHIONEIN, *MOLLUSKS
Abstract

Exposure to one metal might have significant effects on the bioaccumulation of other metals. In the present study, we examined the possible effects of Zn exposure on the bioaccumulation of Cd and Cu in three populations of the oyster Crassostrea hongkongensis. We found that Zn exposure significantly enhanced the tissue concentrations of Cd and Cu in all populations, and the tissue concentrations of Cd and Cu were highly and positively related to the tissue Zn concentration. Furthermore, the enhanced bioaccumulation of Cd and Cu resulted mainly from their increasing accumulation and distribution in two subcellular fractions (i.e., metallothionein-like proteins and metal-rich granules). Tissue concentrations of Cd and Cu in the natural Zn-contaminated oysters also covaried with tissue Zn concentration, and prediction analyses revealed that Zn exposure was a significant contributor to tissue Cd and Cu concentrations. Therefore, we concluded that the increased Zn bioavailability in ambient waters not only increased the tissue Zn concentration but also enhanced the overall bioaccumulation of Cd and Cu. This study strongly demonstrates that contamination of metals in oysters may result from concurrent exposure to other metals. Thus, environmental managers should consider the possible exposure to other metals such as Zn in order to interpret/predict the tissue concentrations of toxic metals in oysters. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results