Arsenic and antimony species in surface transects and depth profiles across a frontal zone: The Chatham Rise,New Zealand |
| |
| Institution: | 1. National Institute of Water & Atmospheric Research, P.O. Box 11 115, Hamilton, New Zealand;2. Ecochemistry Laboratory, Applied Ecology Research Group, University of Canberra, Bruce ACT 2601, Australia;1. College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China;2. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China;3. Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996-4570, USA;1. Department of Molecular Genetics and Microbiology, Pontificia Universidad Catolica de Chile, Avenida Libertador Bernardo O’Higgins 340, Casilla 144-D, C.P. 651 3677, Santiago, Chile;2. Marine Microbiology Group, Mediterranean Institute for Advanced Studies (IMEDEA; CSIC-UIB), Esporles, E-07190, Spain;3. Department of Oceanography, University of Concepcion, Concepcion, Chile;4. GEMA Center for Genomics, Ecology and Environment, Universidad Mayor, Camino La Pirámide 5750, Santiago, Chile;5. Center for Climate and Resilience Research (CR)2, Chile;1. Institute of Environment Engineering and Science, School of Chemistry and Material Science, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South Central University for Nationalities, Wuhan 430074, China;2. Wuhan Qing Liu Technology Company LTD, Wuhan City, Hubei Province, China;3. Daye Non-ferrous Metals Company, Huangshi City, Hubei Province, China;1. Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Prague 6 – Suchdol, 165 21, Czech Republic;2. Regional Centre of Advanced Technologies and Materials, Departments of Physical Chemistry and Experimental Physics, Faculty of Science, Palacký University in Olomouc, ?lechtitel? 27, 783 71, Olomouc, Czech Republic;1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Henan Yuguang Gold & Lead Group Co. Ltd., Henan 459000, China;3. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China |
| |
| Abstract: | Measurements of total dissolved arsenic (As(III+V)) and antimony (Sb(III+V) and their simple methylated species are presented for samples collected from three vertical profiles and along three surface transects in the Chatham Rise region, east of New Zealand. As(III+V) concentrations showed a slight increase with depth (16–17 nM at 25 m to 20 nM at 100 m) whereas Sb(III+V) concentrations were conservative with depth (1.02–1.12 nM). Along the three surface water transects, As(III+V) and Sb(III+V) concentrations showed little variation, with average concentrations of 18±2 and 0.99±0.05 nM, respectively. Inorganic arsenic was not correlated with orthophosphate (r2=0.01). Monomethyl- and dimethyl-arsenic (MMAs, DMAs) concentrations (0.04–0.01 and 0.65–0.07 nM, respectively) decreased with depth, suggesting surface water production by biota and degradation at depth. Along the Chatham Rise transect, DMAs concentrations increased on the Rise (0.65 nM maximum) compared to waters north and south of the Rise (～0.22 nM). Fluctuation in MMAs concentrations were also seen for water samples collected on the Chatham Rise. Monomethyl-, dimethyl- and trimethyl-antimony (MMSb, DMSb, TMSb) species were detected in water samples collected along all the three surface water transects suggesting surface water production by biota. Concentrations of MMSb, DMSb and TMSb in water samples were fairly constant along all the three surface transects (0.06–0.07, 0.015–0.025 and 0.005–0.015 nM, respectively), showing no significant enrichment on the Chatham Rise. These arsenic and antimony results support the current global view that inorganic As and Sb are conservative and the methyl species are of biological origin. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
