Assessment of the effects of dredging on metal levels in port waters using DGT passive samplers and spot sampling
Date
2024
Authors
Carvalhal Silva, H.
Montero, N.
Belzunce Segarra, M.J.
Menchaca, I.
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Journal article
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Marine Pollution Bulletin, 2024; 205:1-8
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Abstract
Aiming at assessing the effect of dredging activities on the levels of metals in Bilbao Port (northern Spain), dissolved and labile metal concentrations in the water were concurrently measured, before, during, and after dredging activities by spot sampling and Diffusive Gradients in Thin-films (DGTs) passive samplers, respectively. Most of the dissolved metal results were below the quantification limits (Cd, <0.06–0.26 μg/L; Co, <5 μg/L; Cu, <5–15 μg/L; Fe, <10–48 μg/L; Mn, <10–22 μg/L; Ni, <2.6–7 μg/L; Pb, <0.39–0.8 μg/L; Zn, <9–24 μg/L).
In contrast, DGT results for all sampling times and stations were obtained (Cd, 0.02–0.12 μg/L; Co, 0.08–0.15 μg/L; Cu, 0.5–2.8 μg/L; Fe, 1.0–3.6 μg/L; Mn, 4.7–23.5 μg/L; Ni, 0.5–0.9 μg/L; Pb, 0.15–0.28 μg/L; Zn, 2.6–7.2 μg/L), enabling to determine those metals affected by dredging. Only labile-Pb concentration surpassed momentarily the DGT-Environmental Quality Standard, enabling to rule out biological effects on biota. DGTs are a promising technique for facilitating decision-making during dredging operations.
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Data source: Supplementary data, https://doi.org/10.1016/j.marpolbul.2024.116653
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Copyright 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license. (https://creativecommons.org/licenses/by/4.0/)