Topic
Trace metal
About: Trace metal is a research topic. Over the lifetime, 5125 publications have been published within this topic receiving 181046 citations.
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01 May 1993
TL;DR: In this paper, a section of the southwestern Indian Ocean, extending from 7 to 27°S around the 56°E meridian, was studied for trace metal concentrations and the results showed that the recycled metals were intermediate between those for the North Atlantic and North Pacific Oceans, as would be expected from known patterns of deep ocean circulation.
Abstract: Dissolved trace metal concentrations are reported for a section in the southwestern Indian Ocean, extending from 7 to 27°S around the 56°E meridian. Overall distributions conform to those found in other oceans, with Cd, Cu, Ni and Zn showing recycled, or nutrient-like, behaviour, whereas Mn is enriched in the mixed layer relative to deep water. Deep-water concentrations of the recycled elements are intermediate between those for the North Atlantic and North Pacific Oceans, as would be expected from known patterns of deep-ocean circulation. For Cd and Zn, depletion in the surface layer approaches detection limits while for Cu and Ni significant near-surface concentrations (0.9 and 2.1 nM, respectively) are found. Relationships between the concentrations of metals and nutrients are similar to those described in the literature for the recycled metals for other regions, although significant variations exist from ocean to ocean. Maximum manganese concentrations in the upper water column are about or below 1 nM, as expected for a region remote from continental sources of airborne particulaet material. Minor variations in maximum concentration with latitude are evident as a result of the complex geochemistry of this element. Deep water manganese concentrations are uniformly low, showing no evidence for benthic or hydrothermal sources.
78 citations
TL;DR: In this article, the authors used sediment cores collected in a freshwater tidal marsh and in the estuary upstream and downstream from the marsh to determine the accumulation of nutrients and trace metals over long time periods.
Abstract: Stratigraphic records from sediment cores collected in a freshwater tidal marsh and in the estuary upstream and downstream from the marsh were used to determine the accumulation of nutrients and trace metals over long time periods. Analysis of pollen and seeds show that the high marsh has formed only within the past 100 yr, following increased sedimentation rates in the area. Variations in nutrient and trace metal accumulations over several decades show that pollutants from agricultural runoff and wastewater discharge are stored to a greater extent in high-marsh than in low-marsh sediments. Greater accumulation rates in the high marsh are probably related to its greater sedimentary organic carbon concentration.
78 citations
TL;DR: Karst rivers, such as the Krka River, with extremely low natural concentrations of trace metals are highly sensitive to the anthropogenic influence and require implementation of strict protection regimes in the entire catchments area.
78 citations
TL;DR: In this paper, the significant carrier phases of several metals during a simulated disturbance of sediments designed to investigate the effects of dredging were investigated in detail in Cleveland Bay in the central Great Barrier Reef.
Abstract: This study has investigated in detail trace metal concentrations in Cleveland Bay in the central Great Barrier Reef and assessed the significant carrier phases of several metals during a simulated disturbance of sediments designed to investigate the effects of dredging. Organic, iron oxide and carbonate phases were shown to be important carrier phases for several trace metals. The application of an acid-leach technique to monitor labile or pollutant concentrations of copper, zinc, lead and nickel in sediments collected from coral reefs sampled before and after two dredging events in 1991 yielded useful information on the fate of dredged sediment. Trace metal contamination close inshore was attributed to port activities, sewage discharge and urbanization.
78 citations
TL;DR: In this article, the long-term average trace metal composition of aerosols collected at two urban (Liverpool and Preston) and one rural (Lancaster) sites on the UK mainland coastal rim of the NE Irish Sea is provided.
78 citations