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 Feb 1981
TL;DR: In this article, the adsorption properties of sinking particulate matter in the deep subtropical Atlantic Ocean are modeled by combining the field observations of trace metal scavenging with theoretical surface chemistry.
Abstract: The adsorption properties of sinking particulate matter in the deep subtropical Atlantic Ocean are modeled by combining the field observations of trace metal scavenging with theoretical surface chemistry The treatment yields equilibrium constants that define metal interactions with deep-ocean particles These equilibrium constants can be compared with those that define metal interactions with typical metal oxides and organic compounds The comparison indicates that metal-particulate matter interactions closely resemble the interactions between organic compounds and metals Therefore, it is suggested that the adsorption properties of marine particulate matter are controlled by organic coatings In addition, quantifying the surface properties of deep-ocean particles provides a means for estimating the scavenging residence times for metals for which the determination has not yet been made
367 citations
TL;DR: It is clearly shown that increases in trace metal concentrations in the soils were generally extensive and obvious in urban and orchard soils, less so in vegetable soils, whilst rural and forest soils were subjected to the least impact of anthropogenic sources of trace metals.
358 citations
TL;DR: The role of trace metals in metalloenzymes has been investigated in this paper, showing that trace metals influence metabolism primarily as a consequence of the role of many of these metals (Fe, Mn, Zn, Cu, Co, Mo, Ni).
Abstract: Large spatial and temporal differences in both trace metal concentrations and chemical speciation in the sea have led to wide variations in biological availability of metals and their effects on phytoplankton. Trace metals are usually taken up by algae via the formation of coordination complexes with specialized transport ligands in their outer membranes, and metal uptake is determined by the interplay between redox, complexation, or oxide dissolution reactions of metals in seawater and ligand-exchange reactions at these sites. Some metals, such as copper and zinc, are heavily chelated by organic ligands in seawater, and their biological availability is determined by the concentrations of free metal ions or of kinetically labile inorganic species (free ions plus inorganic complexes). Once inside cells, trace metals influence metabolism primarily as a consequence of the role of many of these metals (Fe, Mn, Zn, Cu, Co, Mo, Ni) as essential cofactors in metalloenzymes. Trace metals may also inhibit ...
358 citations
TL;DR: In this article, a new method derived from the Lord technique was proposed for quantifying trace metal concentrations in sedimentary pyrite, which involves the sequential leaching of sediments using 1 M HCl (reactive fraction), 10 M HF (silicate fraction) and concentrated HNO 3 (pyrite fraction).
358 citations
TL;DR: This study allowed detection of a clear signature of anthropogenic contamination, in terms of Zn, Cu, Pb, and Cr in the north bank of the estuary, which experiences high urban pressure.
357 citations