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Spatiotemporal characterization of metals in small craft harbour sediments in Nova Scotia, Canada

Author:
Zhang, Hongling, Walker, Tony R., Davis, Emily, Ma, Guofeng
Source:
Marine pollution bulletin 2019 v.140 pp. 493-502
ISSN:
0025-326X
Subject:
cadmium, guidelines, mercury, sediments, water pollution, Nova Scotia
Abstract:
Spatiotemporal (2001–2017) characterization of sediment metal concentrations were assessed in 31 small craft harbours (SCHs) in Nova Scotia, Canada by analyzing secondary data from government sediment assessment reports. Surficial sediment samples (n = 576) were collected prior to routine maintenance or constriction dredging activities. Sediment metal concentration ranges were 0.5–62 (As), 0.05–3.8 (Cd), 1–305 (Cr), 0.5–220 (Cu), 0.003–1.85 (Hg), 0.73–583 (Pb) and 5–2300 (Zn) mg/kg (dw), respectively. Most sediment metal concentrations (>56% of samples) were below low effect level and >96% were below high effect level sediment quality guidelines, suggesting limited ecological impairment to marine biota. Despite wide temporal coverage (16 years), large variation in sediment concentrations across SCHs were likely due to regular dredging activities preventing long-term accumulation of contaminants. Spatial distribution and enrichment factor results revealed that Canso was most impacted by metals, followed by Clarks Harbour.
Agid:
6306660