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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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TL;DR: There was no measurable accumulation of radioisotopes in gill tissues, suggesting that the gills were not the major organ of metal uptake in Hexagenia in this experiment, and net uptake of 109Cd and 65Zn by the gut exceeded that by all other body parts in both quantity and concentration terms.
Abstract: Radioisotopes of cadmium, lead, and zinc added in trace amounts to lake sediments were used to measure the uptake and efflux of these metals from various body parts of nymphs of the burrowing mayfly Hexagenia rigida (Ephemeroptera). Total metal concentrations in Hexagenia and its environment were held constant. A simple model permitted the estimation of rate constants that were used to generate model curves which corresponded closely to the measured trends in trace metal uptake and efflux. There was no measurable accumulation of radioisotopes in gill tissues, suggesting that the gills were not the major organ of metal uptake in Hexagenia in this experiment. On the other hand, net uptake of 109Cd and 65Zn by the gut exceeded that by all other body parts in both quantity and concentration terms, suggesting that the primary source of these metals to Hexagenia is sediment consumed as food. The rate of exchange of 65Zn was slower than that of 109Cd. 210Pb differed from the other two metals in that it was not d...

80 citations

Journal ArticleDOI
TL;DR: The geochemical behavior of dissolved trace elements in sediment interstitial waters from the Vigo Ria (Galicia, Spain) has been determined as mentioned in this paper, showing that the metal profiles were affected by sedimentary redox processes, which were monitored by means of Mn and Fe concentrations and pore water pH.

79 citations

Journal ArticleDOI
TL;DR: In this article, the US GEOTRACES Eastern Pacific Zonal Transect (cruise GP16) in the Eastern Tropical South Pacific (ETSP) exhibited consistent maxima in P and other bioactive trace metals, and minima in particulate Mn, in the oxygen deficient zones (ODZs) of 13 stations.
Abstract: Little is known about the trace metal content of marine prokaryotes, in part due to their co-occurrence with more abundant particulate phases in the upper ocean, such as phytoplankton and biogenic detritus, lithogenic minerals, and authigenic Mn and Fe oxyhydroxides. We attempt to isolate these biomass signals in particulate data from the US GEOTRACES Eastern Pacific Zonal Transect (cruise GP16) in the Eastern Tropical South Pacific (ETSP), which exhibited consistent maxima in P and other bioactive trace metals, and minima in particulate Mn, in the oxygen deficient zones (ODZs) of 13 stations. Nitrite maxima and nitrate deficits indicated the presence of denitrifying prokaryotic biomass within ETSP ODZs, and deep secondary fluorescence maxima at the upper ODZ boundaries of 10 stations also suggested the presence of low-light, autotrophic communities. ODZs were observed as far west as 99°W, more than 2300 km from the South American coast, where eolian lithogenic and lateral/resuspended sedimentary inputs were negligible, presenting a unique opportunity to examine prokaryotic metal stoichiometries. ODZ particulate P maxima can rival gyre mixed layer biomass concentrations, are highly sensitive to oxygen, and are in excess of amounts scavengable by local Fe oxyhydroxides and acid–volatile sulfides. Even after correction for lithogenic and ferruginous–scavenged metals, ODZ P-maxima are often enriched in Cd, Co, Cu, Ni, V, and Zn, exhibiting particulate trace metal ratios to P that exceed mixed layer biomass ratios by factors of 2–9. ODZ prokaryotic communities may be largely hidden, TM–rich pools involved in the marine cycles of these bioactive trace metals.

79 citations

Journal ArticleDOI
TL;DR: Sediment quality guidelines along with calculated enrichment factors and trace metal profiles indicate that Asaluyeh port is threated by contamination, especially with respect to Hg and Cu.

79 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202394
2022225
2021197
2020220
2019193
2018186