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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: The calculated estimated daily intake (EDI) and hazard indices indicate that the metal levels are lower than the permissible limits of Malaysian and International seafood’s guidelines and results in no acute toxicities and safe for human consumption.
54 citations
TL;DR: Biological variables seemed to influence metallothionein concentration in the organisms and their effect should be carefully considered for a correct assessment of differences between stations, as well as the relationship with abiotic factors (salinity) and biological variables (size of sampled organisms) was determined.
54 citations
TL;DR: Natural epilithic periphyton may be a potential metal biomonitor particularly of Cu, Cd and Zn in aquatic systems and provide supporting information in relation to potential sediment toxicity.
Abstract: Surficial sediments and epilithic periphyton (biofilm) were sampled from six sites on the River Churnet and five sites on the River Manifold in Staffordshire and analysed for cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn). The sites demonstrated a wide range of sediment trace metal concentrations determined by inductively coupled plasma optical emission spectrometry (ICP-OES) and atomic absorbtion spectroscopy (AAS). Biofilm was removed from the substrate using physical abrasion and 0.005 M ethylenediaminoethanetetra-acetic acid (EDTA) extractant. The European Standards, Measurements and Testing Programmes (BCR) operationally defined geochemical speciation scheme was used to determine the exchangeable, acid soluble fraction of the sediments. Significant positive correlations were determined between the EDTA extractable biofilm and the exchangeable sediment fraction for Cd, Cu and Zn but not for Pb. Natural epilithic periphyton may be a potential metal biomonitor particularly of Cu, Cd and Zn in aquatic systems and provide supporting information in relation to potential sediment toxicity.
54 citations
TL;DR: It was found that Cd concentrations in animals were better predicted by free Cd ion concentrations provided that the authors took into account competition between hydrogen ions and free cadmium ions at biological uptake sites, suggesting that this model would provide an effective theoretical framework for the use of Chaoborus larvae as Cd biomonitors in nature.
Abstract: We tested larvae of three species of the widespread lacustrine insect Chaoborus as potential biomonitors of the trace metals Cd, Cu, Pb, and Zn. Chemical and biological measurements were made in a large number of lakes covering a wide range of pHs and trace metal concentrations and distributed over a large geographical area. Concentrations of Cu and Zn in sediment and water varied widely among lakes but not in animals, suggesting that the insects regulate these essential metals over a wide range of environmental concentrations and consequently would be of little use for monitoring Cu or Zn. Although lead concentrations in the Chaoborus species varied more widely than did those of Cu or Zn, we were not able to relate larval Pb concentrations consistently to those! in sediment or water, suggesting that further research on this metal is needed. Cadmium concentrations in Chaoborus were not well explained by total Cd concentrations in either sediment or water. We found that Cd concentrations in animals were better predicted by free Cd ion concentrations provided that we took into account competition between hydrogen ions and free cadmium ions at biological uptake sites. This result is consistent with the mainly laboratory based free-sion activity model and suggests that this model would provide an effective theoretical framework for the use of Chaoborus larvae as Cd biomonitors in nature.
54 citations
TL;DR: It is revealed that the area which has arsenic and trace metal contaminated groundwater may also contain high level of arsenic and Trace metals in the agricultural soil due to irrigation with contaminated groundwater.
Abstract: Arsenic contaminated groundwater of Bangladesh is one of the largest natural calamities of the world. Soil samples were collected from floodplain agricultural land of Faridpur and Dhamrai regions to estimate the concentration of arsenic and other trace metals (copper, nickel, zinc, chromium, cadmium, lead, selenium, cobalt, mercury, and manganese). Average arsenic in Faridpur soil was recorded more than three times higher than the world limit and nearly five times higher than that of Dhamrai. The average copper, chromium and cobalt both in Faridpur and Dhamrai agricultural soil were also higher than the Dutch and the world standards. Both Fardipur and Dhamrai soil contain low amount of selenium in comparison to world limit (0.7 mg kg(-1)). A poor correlation between manganese and arsenic was noticed in Faridpur. This may be played a subordinate role in the fixation of arsenic in soil. This study also reveals that the area which has arsenic and trace metal contaminated groundwater may also contain high level of arsenic and trace metals in the agricultural soil due to irrigation with contaminated groundwater.
54 citations