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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 degree of anthropogenic influences of the trace metal distribution of soils from Danang-Hoian area (Vietnam) were studied. But the results showed that heavy metal contents show an increasing tendency in the fine fraction (silt and clay).
Abstract: This work is part of a research study which is intended to study the degree of anthropogenic influences of the trace metal distribution of soils from Danang-Hoian area (Vietnam). Cu, Ni, Zn and Zr show significant effects in most of the cultivated soil categories, especially in the industrial soils. Extremely high levels of Pb (up to 742 μg/g) are observed in the industrial soil category, which shows an enrichment factor 114 as compared to rural soils. Cd shows only a relative local enrichment with the maximum level of 4.6 μg/g in urban soils. Sequential extraction was performed in selected samples to evaluate the geochemical trace metals. The result indicates that Zn and Cr are mainly found in the crystal and amorphous Fe oxide bounded forms. The contents of Cr in these fractions comprise more than 94% of total extractable Cr. In the case of Zn, 85% of total extractable Zn is in fractions FV and FVI. Cu is mainly found in the organic fraction at an average of 39.3% of total extractable content. On the other hand, heavy metal contents show an increasing tendency in the fine fraction (silt and clay).

81 citations

Journal ArticleDOI
TL;DR: Results showed that dissolved heavy metals are indeed bioavailable within the aquaculture pond system, and concentrations recorded in this study are comparable to highly contaminated environments, such as those exposed to urban, industrial and mining pollution.

81 citations

Journal ArticleDOI
TL;DR: In this article, a series of transects at the 6°W meridian including the Polar Frontal region (PFr), the southern Antarctic Circumpolar Current area (sACC area) and the Weddell Gyre Boundary Front (WGBF) were conducted.

81 citations

Journal ArticleDOI
TL;DR: It is suggested that trace metal assimilation and regeneration in Daphnia may play an important role in the biogeochemical fates of metals in lake systems.
Abstract: The assimilation efficiency (AE), efflux rate, and release budget of Cd, Cr(III), Se(IV), and Zn by a freshwater zooplankton Daphnia magna were measured under different food concentrations. The AEs of trace elements by Daphnia on two algal diets (Chlamydomonas reinhardtii and Scenedesmus obliquus) were 30–77% for Cd, 8–44% for Cr, 24–58% for Se, and 7–66% for Zn at food concentrations ranging from 0.136 to 7.50 mg carbon L−1. Metal AEs increased significantly with decreasing food concentrations, with a maximum increase of 5.5 and 4.0X for Zn and Cr, respectively. AEs were generally on the order of Cd > Se > Zn > Cr. Efflux rate constants, determined during 7 d depuration after 8 d of exposure to metals in the dissolved phase or dietary phase, were 0.012–0.216 d−1, with the highest efflux for Zn, followed by Cr > Se > Cd. The relative contribution of different routes of metal loss to the overall metal loss was also quantitatively assessed during the 7-d depuration period. Metals differed substantially in their routes of release from Daphnia. In general, metal excretion into the dissolved phase was the most important route for metal loss. Molting represented nearly 50–70% and 20–70% of daily metal efflux for Cd and Zn, respectively, following aqueous exposure within the first 4 d but was <20 and <30%, respectively, following food exposure. Release by offspring production contributed substantially to Se efflux by the animals. Up to 44–67% and 16–47% of Se was lost from the animals through reproductive allocation on a daily basis following uptake from the aqueous and dietary phases, respectively. The major routes of Cr efflux were by excretion and feces egestion. Our study suggested that trace metal assimilation and regeneration in Daphnia may play an important role in the biogeochemical fates of metals in lake systems.

80 citations

Journal ArticleDOI
TL;DR: Geographical variation in bioavailabilities is clear for several metals, with hotspots for arsenic, copper, nickel and silver at Chai Wan Kok, and for lead in Junk Bay.

80 citations


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