Tracing the natural and anthropogenic influence on the trace elemental chemistry of estuarine macroalgae and the implications for human consumption.

Autor: Ownsworth E; Department of Earth Sciences, Durham University, Durham, England DH1 3LE, United Kingdom of Great Britain and Northern Ireland. Electronic address: e.m.ownsworth@durham.ac.uk., Selby D; Department of Earth Sciences, Durham University, Durham, England DH1 3LE, United Kingdom of Great Britain and Northern Ireland; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan, Hubei Province 430074, China., Ottley CJ; Department of Earth Sciences, Durham University, Durham, England DH1 3LE, United Kingdom of Great Britain and Northern Ireland., Unsworth E; Department of Earth Sciences, Durham University, Durham, England DH1 3LE, United Kingdom of Great Britain and Northern Ireland., Raab A; Department of Chemistry, University of Aberdeen, Aberdeen, Scotland AB24 3UE, United Kingdom of Great Britain and Northern Ireland., Feldmann J; Department of Chemistry, University of Aberdeen, Aberdeen, Scotland AB24 3UE, United Kingdom of Great Britain and Northern Ireland., Sproson AD; Department of Earth Sciences, Durham University, Durham, England DH1 3LE, United Kingdom of Great Britain and Northern Ireland; Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa 275-8564, Japan., Kuroda J; Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa 275-8564, Japan., Faidutti C; Department of Chemistry, University of Aberdeen, Aberdeen, Scotland AB24 3UE, United Kingdom of Great Britain and Northern Ireland., Bücker P; Department of Chemistry, University of Aberdeen, Aberdeen, Scotland AB24 3UE, United Kingdom of Great Britain and Northern Ireland.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2019 Oct 01; Vol. 685, pp. 259-272. Date of Electronic Publication: 2019 May 21.
DOI: 10.1016/j.scitotenv.2019.05.263
Abstrakt: Macroalgae (seaweed) has been shown to be an effective environmental indicator. We investigate the trace element chemistry of macroalgae samples from locations along the Firth of Forth and Forth Estuary in Scotland. The overall trend in elemental abundance (Os ≪ Re < Ag < U < Cd < Co < Ni < Pb < Cu < As < Zn ≪ I), and changes along the estuary (seawards: increase As, I, Cd, U, Re, Os; decrease Pb, Cu; mid-estuary peak Zn; based on certain species), are controlled by a number of factors, including: salinity, mixing and macroalgal species differences. Within the same macroalgal species, some elemental abundances (As, I, Pb, Cu, Cd and U) are affected by mixing between freshwater riverine and North Sea marine saltwater. Additional mixing of natural and anthropogenic inputs from the surrounding geology and industry are also observed, affecting Zn, Ni, Co, Re and Os. Macroalgae is also an increasingly popular food, with some species harvested in the Firth of Forth. Iodine (67-5061 ppm), lead (0.047-4.1 ppm) and cadmium (0.006-0.93 ppm) macroalgal abundances are at safe levels for human consumption (WHO limits). However, many samples exceed the American (3 ppm) and Australian (1 ppm) limits for inorganic arsenic in macroalgae, with values ranging 0-67 ppm. In most of the samples, soaking and cooking the macroalgae reduced the inorganic arsenic content to within the American and Australian limits. However, this has further implications if the macroalgae is used to cook soups (e.g., Dashi), as the leached elements become a significant component of the soup.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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