Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 538, Issue -, Pages 644-653Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2015.08.102
Keywords
Arsenic; Mercury; Cadmium; Fractionation; Ornithogenic sediments; East Antarctica
Categories
Funding
- Chinese Arctic and Antarctic Administration of the State Oceanic Administration
- National Natural Science Foundation of China [41576183, 41376124]
- Chinese Polar Environment Comprehensive Investigation & Assessment Programmes [CHINARE2015-04-04-09]
- NSF Grant [ANT 0739575]
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0739575] Funding Source: National Science Foundation
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To evaluate mobility of toxic elements and their potential ecological risk caused by seabird biovectors, the fractionation distributions of arsenic (As), mercury (Hg) and cadmium (Cd) were investigated in three ornithogenic sediment profiles from the Ross Sea region, East Antarctica. The results show residual As holds a dominant position, and Hg mainly derives from residual, organic matter-bound and humic acid-bound fractions, indicating weak mobility of As and Hg. However, exchangeable Cd occupies a considerable proportion in studied samples, suggesting Cd has strong mobility. The preliminary evaluation of Sediment Quality Guidelines (SGQs) shows adverse biological effects may occur occasionally for As and Cd, and rarely for Hg. Using Risk Assessment Code (RAC), the ecological risk is assessed at moderate, low and very high for As, Hg and Cd pollution, respectively. Organic matter derived from guano is the main factor controlling the mobility of Hg and Cd through adsorption and complexation. (C) 2015 Elsevier B.V. All rights reserved.
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