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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: In this article, the trace metal profiles agree in general with previously reported profiles from the Atlantic Ocean, and they conclude that the sampling and analytical methods employed for this effort, while still in need of improvement, are sufficient for obtaining accurate concentration data on most trace metals in the major water masses of the oceans, and to enable some evaluation of the biogeochemical cycling of the metals.
83 citations
TL;DR: It is found that specific UV absorbance (SUVA254: an indicator of DOM aromaticity) has a significant correlation with dissolved trace metal to dissolved organic carbon concentration ratios ([Me]T/[DOC]) for copper and iron in natural freshwaters and treated municipal wastewater in the Sagami River basin, Japan.
83 citations
TL;DR: In this paper, the seasonal variability in the concentration of sulfide minerals and associated trace metals in the top 10 cm of sediment was investigated in two different biogeochemical environments in Chesapeake Bay.
Abstract: The solid phase chemical speciation of Fe, Cu, Ni, and Zn was investigated in two different biogeochemical environ ments in Chesapeake Bay to quantify the seasonal variability in the concentration of sulfide minerals and associated trace metals in the top 10 cm of sediment. When acid volatile sulfides (AVS) constitute less than 20% of HCl-soluble Fe (“reactive” Fe), the system is dynamic with respect to metals, and the formation and destruction of AVS minerals can potentially result in statistically significant seasonal shifts in both the flux of Cu across the sediment−water interface and the sedimentary concentration of Cu and Zn. When greater than 20% of HCl-soluble Fe is bound within AVS minerals, there is enough sulfide to effectively trap metals within the sediments, and temporal variations in AVS and pyrite do not necessarily result in temporal variations in the concentration of diagenetically available trace metals. Analysis of the ratio of reactive Fe to AVS can potentially increase the reliabilit...
83 citations
TL;DR: Trace metal variability was evaluated in two populations of Mytilus californianus through the analysis of individual specimens, indicating that variability may need to be evaluated for each population (site) studied.
82 citations
TL;DR: In this paper, changes in the properties of soil solution in the rhizosphere of developing radish plants were investigated, and it is hypothesized that this is partly a result of Ca-metal-ligand equilibrium in solution with higher Ca concentrations in unplanted soil leading to more of the Cd and Zn in solution existing in the uncomplexed state.
Abstract: Changes in the properties of soil solution in the rhizosphere of developing radish plants were investigated. Variations in these properties were expected to affect the distribution and speciation of metals in the soil and soil solution. Applications of essential nutrients were linked to plant transpiration rates and prevented excess addition of nutrient ions, so that subtle changes in soil solution composition would not be obscured. Soil solution pH, the concentration of dissolved organic carbon (DOC) and the concentrations of major and trace elements in solution were found to vary over time. Strict control of fertilizer additions led to the maintenance of a relatively low ionic strength in the soil solution, and under such conditions trace metal solubility appeared to be highy influenced by the concentration of DOC. A chemical speciation analysis was performed which showed that, while dissolved Cd and Zn were largely uncomplexed in unplanted soil, Cd and Zn in the rhizosphere existed mainly as complexed forms. It is hypothesized that this is partly a result of Ca-metal-ligand equilibrium in solution, with higher Ca concentrations in unplanted soil leading to more of the Cd and Zn in solution existing in the uncomplexed state. Changes in the concentrations of uncomplexed Cd and Zn with time gave the best correlations with changes in plant uptake of these metals over time, supporting the hypothesis that plants mainly absorb the free metal ion from soil solution.
82 citations